1
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Reed ZD, Tran H, Ngo HN, Hartmann JM, Hodges JT. Effect of Non-Markovian Collisions on Measured Integrated Line Shapes of CO. PHYSICAL REVIEW LETTERS 2023; 130:143001. [PMID: 37084433 DOI: 10.1103/physrevlett.130.143001] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/15/2022] [Revised: 01/25/2023] [Accepted: 03/10/2023] [Indexed: 05/03/2023]
Abstract
Using cavity ring-down spectroscopy to probe R-branch transitions of CO in N_{2}, we show that the spectral core of the line shapes associated with the first few rotational quantum numbers, J, can be accurately modeled using a sophisticated line profile, provided that a pressure-dependent line area is introduced. This correction vanishes as J increases and is always negligible in CO-He mixtures. The results are supported by molecular dynamics simulations attributing the effect to non-Markovian behavior of collisions at short times. This work has large implications because corrections must be considered for accurate determinations of integrated line intensities, and for spectroscopic databases and radiative transfer codes used for climate predictions and remote sensing.
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Affiliation(s)
- Zachary D Reed
- Chemical Sciences Division, National Institute of Standards and Technology, Gaithersburg, Maryland 20899, USA
| | - Ha Tran
- Laboratoire de Météorologie Dynamique/IPSL, CNRS, Sorbonne Université, Ecole Polytechnique, Institut polytechnique de Paris, Ecole Normale Supérieure, PSL Research University, 4 place Jussieu, 75252, Paris, France
| | - Hoa N Ngo
- Faculty of Physics, Hanoi National University of Education, 136 Xuan Thuy, Cau Giay, Hanoi, Vietnam
| | - Jean-Michel Hartmann
- Laboratoire de Météorologie Dynamique/IPSL, CNRS, Sorbonne Université, Ecole Polytechnique, Institut polytechnique de Paris, Ecole Normale Supérieure, PSL Research University, 4 place Jussieu, 75252, Paris, France
| | - Joseph T Hodges
- Chemical Sciences Division, National Institute of Standards and Technology, Gaithersburg, Maryland 20899, USA
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2
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Huang X, Schwenke DW, Freedman RS, Lee TJ. Ames-2021 CO 2 Dipole Moment Surface and IR Line Lists: Toward 0.1% Uncertainty for CO 2 IR Intensities. J Phys Chem A 2022; 126:5940-5964. [PMID: 36007245 DOI: 10.1021/acs.jpca.2c01291] [Citation(s) in RCA: 4] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
A highly accurate CO2 ab initio dipole moment surface (DMS), Ames-2021, is reported along with 12C16O2 infrared (IR) intensity comparisons approaching a 1-4‰ level of agreement and uncertainty. The Ames-2021 DMS was accurately fitted from CCSD(T) finite-field dipoles computed with the aug-cc-pVXZ (X = T, Q, 5) basis for C atom and the d-aug-cc-pVXZ (X = T, Q, 5) basis for O atoms, and extrapolated to the one particle basis set limit. Fitting σrms is 3.8 × 10-7 au for 4443 geometries below 15 000 cm-1. The corresponding IR intensity, SAmes-2021, are computed using the Ames-2 potential energy surface (PES), which is the best PES available for CO2. Compared to high accuracy IR studies for 2001i-00001 and 3001i-00001 bands, SAmes-2021 matches NIST experiment-based intensities [SNIST-HIT16 or SHIT20] to -1.0 ± 1.3‰, or matches DLR experiment-based intensities [SDLR-HIT16/UCL/Ames] to 1.9 ± 3.7‰. This indicates the systematic deviations and uncertainties have been significantly reduced in SAmes-2021. The SUCL2015 (or SHITRAN2016) have larger deviations (vs SDLR) and uncertainties (vs SDLR, SNIST) which are attributed to the less accurate Ames-1 PES adopted in UCL-296 line list calculation. The SAmes-2021 intensity of 12C16O2 and 13C16O2 is utilized to derive new absolute 13C/12C ratios for Vienna PeeDee Belemnite (VPDB) with uncertainty reduced by 1/3 or 2/3. Further evaluation of SAmes-2021 intensities are carried out on those CO2 bands discussed in the HITRAN2020 update paper. Consistent improvements and better accuracies are found in band-by-band analysis, except for those bands strongly affected by Coriolis couplings, or very weak bands measured with relatively larger experimental uncertainties. The Ames-2021 296 K IR line lists are generated for 13 CO2 isotopologues, with 18 000 cm-1 and S296 K > 1 × 10-31 cm/molecule cutoff and then combined with CDSD line positions (except 14C16O2). The Ames-2021 DMS and 296 K IR line lists represent a major improvement over previous CO2 theoretical IR intensity studies, including Ames-2016, UCL-296, and recent UCL DMS 2021 update. A real 1 permille level of agreement and uncertainty will definitely require both more accurate PES and more accurate DMS.
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Affiliation(s)
- Xinchuan Huang
- MS 245-6, Astrophysics Branch, Space Science and Astrobiology Division, NASA Ames Research Center, Moffett Field, California 94035, United States.,SETI Institute, 339 Bernardo Avenue, Suite 200, Mountain View, California 94043, United States
| | - David W Schwenke
- MS 258-2, NAS Facility, NASA Ames Research Center, Moffett Field, California 94035, United States
| | - Richard S Freedman
- SETI Institute, 339 Bernardo Avenue, Suite 200, Mountain View, California 94043, United States.,MS 245-3, Planetary Systems Branch, Space Science and Astrobiology Division, NASA Ames Research Center, Moffett Field, California 94035, United States
| | - Timothy J Lee
- MS 245-3, Planetary Systems Branch, Space Science and Astrobiology Division, NASA Ames Research Center, Moffett Field, California 94035, United States
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3
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Bielska K, Kyuberis AA, Reed ZD, Li G, Cygan A, Ciuryło R, Adkins EM, Lodi L, Zobov NF, Ebert V, Lisak D, Hodges JT, Tennyson J, Polyansky OL. Subpromille Measurements and Calculations of CO (3-0) Overtone Line Intensities. PHYSICAL REVIEW LETTERS 2022; 129:043002. [PMID: 35939021 DOI: 10.1103/physrevlett.129.043002] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/16/2022] [Accepted: 05/26/2022] [Indexed: 06/15/2023]
Abstract
Intensities of lines in the near-infrared second overtone band (3-0) of ^{12}C^{16}O are measured and calculated to an unprecedented degree of precision and accuracy. Agreement between theory and experiment to better than 1‰ is demonstrated by results from two laboratories involving two independent absorption- and dispersion-based cavity-enhanced techniques. Similarly, independent Fourier transform spectroscopy measurements of stronger lines in this band yield mutual agreement and consistency with theory at the 1‰ level. This set of highly accurate intensities can provide an intrinsic reference for reducing biases in future measurements of spectroscopic peak areas.
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Affiliation(s)
- Katarzyna Bielska
- Institute of Physics, Faculty of Physics, Astronomy and Informatics, Nicolaus Copernicus University in Toruń, Grudziadzka 5, 87-100 Torun, Poland
| | - Aleksandra A Kyuberis
- Van Swinderen Institute for Particle Physics and Gravity, University of Groningen, Nijenborgh 4, 9747AG Groningen, The Netherlands
| | - Zachary D Reed
- Chemical Sciences Division, National Institute of Standards and Technology, Gaithersburg, Maryland 20899, USA
| | - Gang Li
- PTB (Physikalisch-Technische Bundesanstalt), Bundesallee 100, 38116 Braunschweig, Germany
| | - Agata Cygan
- Institute of Physics, Faculty of Physics, Astronomy and Informatics, Nicolaus Copernicus University in Toruń, Grudziadzka 5, 87-100 Torun, Poland
| | - Roman Ciuryło
- Institute of Physics, Faculty of Physics, Astronomy and Informatics, Nicolaus Copernicus University in Toruń, Grudziadzka 5, 87-100 Torun, Poland
| | - Erin M Adkins
- Chemical Sciences Division, National Institute of Standards and Technology, Gaithersburg, Maryland 20899, USA
| | - Lorenzo Lodi
- Department of Physics and Astronomy, University College London, Gower Street, London WC1E 6BT, United Kingdom
| | - Nikolay F Zobov
- Department of Physics and Astronomy, University College London, Gower Street, London WC1E 6BT, United Kingdom
| | - Volker Ebert
- PTB (Physikalisch-Technische Bundesanstalt), Bundesallee 100, 38116 Braunschweig, Germany
| | - Daniel Lisak
- Institute of Physics, Faculty of Physics, Astronomy and Informatics, Nicolaus Copernicus University in Toruń, Grudziadzka 5, 87-100 Torun, Poland
| | - Joseph T Hodges
- Chemical Sciences Division, National Institute of Standards and Technology, Gaithersburg, Maryland 20899, USA
| | - Jonathan Tennyson
- Department of Physics and Astronomy, University College London, Gower Street, London WC1E 6BT, United Kingdom
| | - Oleg L Polyansky
- Department of Physics and Astronomy, University College London, Gower Street, London WC1E 6BT, United Kingdom
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4
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Tan Y, Xu YR, Hua TP, Liu AW, Wang J, Sun YR, Hu SM. Cavity-enhanced saturated absorption spectroscopy of the (30012) − (00001) band of 12C16O2. J Chem Phys 2022; 156:044201. [DOI: 10.1063/5.0074713] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Affiliation(s)
- Y. Tan
- Department of Chemical Physics, University of Science and Technology of China, Hefei 230026, China
- CAS Center for Excellence in Quantum Information and Quantum Physics, University of Science and Technology of China, Hefei 230026, China
| | - Y.-R. Xu
- Department of Chemical Physics, University of Science and Technology of China, Hefei 230026, China
| | - T.-P. Hua
- Department of Chemical Physics, University of Science and Technology of China, Hefei 230026, China
| | - A.-W. Liu
- Department of Chemical Physics, University of Science and Technology of China, Hefei 230026, China
- CAS Center for Excellence in Quantum Information and Quantum Physics, University of Science and Technology of China, Hefei 230026, China
| | - J. Wang
- Department of Chemical Physics, University of Science and Technology of China, Hefei 230026, China
- CAS Center for Excellence in Quantum Information and Quantum Physics, University of Science and Technology of China, Hefei 230026, China
| | - Y. R. Sun
- Department of Chemical Physics, University of Science and Technology of China, Hefei 230026, China
- CAS Center for Excellence in Quantum Information and Quantum Physics, University of Science and Technology of China, Hefei 230026, China
| | - S.-M. Hu
- Department of Chemical Physics, University of Science and Technology of China, Hefei 230026, China
- CAS Center for Excellence in Quantum Information and Quantum Physics, University of Science and Technology of China, Hefei 230026, China
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5
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Furtenbacher T, Hegedus ST, Tennyson J, Császár AG. Analysis of measured high-resolution doublet rovibronic spectra and related line lists of CH and OH. Phys Chem Chem Phys 2022; 24:19287-19301. [PMID: 35929432 PMCID: PMC9382695 DOI: 10.1039/d2cp02240k] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Detailed understanding of the energy-level structure of the quantum states as well as of the rovibronic spectra of the ethylidyne (CH) and the hydroxyl (OH) radicals is mandatory for a...
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Affiliation(s)
- Tibor Furtenbacher
- MTA-ELTE Complex Chemical Systems Research Group, Pázmány Péter sétány 1/A, H-1117 Budapest, Hungary.
| | - Samuel T Hegedus
- Department of Physics and Astronomy, University College London, Gower Street, London WC1E 6BT, UK.
| | - Jonathan Tennyson
- Department of Physics and Astronomy, University College London, Gower Street, London WC1E 6BT, UK.
| | - Attila G Császár
- MTA-ELTE Complex Chemical Systems Research Group, Pázmány Péter sétány 1/A, H-1117 Budapest, Hungary.
- Laboratory of Molecular Structure and Dynamics, Institute of Chemistry, ELTE Eötvös Loránd University and MTA-ELTE Complex Chemical Systems Research Group, Pázmány Péter sétány 1/A, H-1117 Budapest, Hungary
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6
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Guay P, Hébert NB, Tourigny-Plante A, Michaud-Belleau V, Genest J. Correcting photodetector nonlinearity in dual-comb interferometry. OPTICS EXPRESS 2021; 29:29165-29174. [PMID: 34615032 DOI: 10.1364/oe.435701] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/01/2021] [Accepted: 08/18/2021] [Indexed: 06/13/2023]
Abstract
Photodetector nonlinearity, the main limiting factor in terms of optical power in the detection chain, is corrected to improve the signal-to-noise ratio of a short-time measurement in dual-comb spectroscopy. An iterative correction algorithm minimizing out-of-band spectral artifacts based on nonlinearity correction methods used in classical Fourier-transform spectrometers is presented. The exactitude of the nonlinearity correction is validated using a low power linear measurement. Spectroscopic lines of H12CN are provided and the increase in absorption depth of 24% caused by the saturation of the detector is corrected yielding residuals limited by the measurement noise.
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7
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Lukusa Mudiayi J, Maurin I, Mashimo T, de Aquino Carvalho JC, Bloch D, Tokunaga SK, Darquié B, Laliotis A. Linear Probing of Molecules at Micrometric Distances from a Surface with Sub-Doppler Frequency Resolution. PHYSICAL REVIEW LETTERS 2021; 127:043201. [PMID: 34355958 DOI: 10.1103/physrevlett.127.043201] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/07/2021] [Revised: 04/18/2021] [Accepted: 06/10/2021] [Indexed: 06/13/2023]
Abstract
We report on precision spectroscopy of subwavelength confined molecular gases. This was obtained by rovibrational selective reflection of NH_{3} and SF_{6} gases using a quantum cascade laser at λ≈10.6 μm. Our technique probes molecules at micrometric distances (≈λ/2π) from the window of a macroscopic cell with submegahertz resolution, allowing molecule-surface interaction spectroscopy. We exploit the linearity and high resolution of our technique to gain novel spectroscopic information on the SF_{6} greenhouse gas, useful for enriching molecular databases. The natural extension of our work to thin cells will allow compact frequency references and improved measurements of the Casimir-Polder interaction with molecules.
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Affiliation(s)
- J Lukusa Mudiayi
- Laboratoire de Physique des Lasers, Université Sorbonne Paris Nord, F-93430 Villetaneuse, France
- CNRS, UMR 7538, LPL, 99 Avenue J.-B. Clément, F-93430 Villetaneuse, France
| | - I Maurin
- Laboratoire de Physique des Lasers, Université Sorbonne Paris Nord, F-93430 Villetaneuse, France
- CNRS, UMR 7538, LPL, 99 Avenue J.-B. Clément, F-93430 Villetaneuse, France
| | - T Mashimo
- Laboratoire de Physique des Lasers, Université Sorbonne Paris Nord, F-93430 Villetaneuse, France
- CNRS, UMR 7538, LPL, 99 Avenue J.-B. Clément, F-93430 Villetaneuse, France
| | - J C de Aquino Carvalho
- Laboratoire de Physique des Lasers, Université Sorbonne Paris Nord, F-93430 Villetaneuse, France
- CNRS, UMR 7538, LPL, 99 Avenue J.-B. Clément, F-93430 Villetaneuse, France
| | - D Bloch
- Laboratoire de Physique des Lasers, Université Sorbonne Paris Nord, F-93430 Villetaneuse, France
- CNRS, UMR 7538, LPL, 99 Avenue J.-B. Clément, F-93430 Villetaneuse, France
| | - S K Tokunaga
- Laboratoire de Physique des Lasers, Université Sorbonne Paris Nord, F-93430 Villetaneuse, France
- CNRS, UMR 7538, LPL, 99 Avenue J.-B. Clément, F-93430 Villetaneuse, France
| | - B Darquié
- Laboratoire de Physique des Lasers, Université Sorbonne Paris Nord, F-93430 Villetaneuse, France
- CNRS, UMR 7538, LPL, 99 Avenue J.-B. Clément, F-93430 Villetaneuse, France
| | - A Laliotis
- Laboratoire de Physique des Lasers, Université Sorbonne Paris Nord, F-93430 Villetaneuse, France
- CNRS, UMR 7538, LPL, 99 Avenue J.-B. Clément, F-93430 Villetaneuse, France
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8
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Fleisher AJ, Yi H, Srivastava A, Polyansky OL, Zobov NF, Hodges JT. Absolute 13C/ 12C Isotope Amount Ratio for Vienna Pee Dee Belemnite from Infrared Absorption Spectroscopy. NATURE PHYSICS 2021; 17:10.1038/s41567-021-01226-y. [PMID: 36873572 PMCID: PMC9982939 DOI: 10.1038/s41567-021-01226-y] [Citation(s) in RCA: 9] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/06/2023]
Abstract
Measurements of isotope ratios are predominantly made with reference to standard specimens that have been characterized in the past. In the 1950s, the carbon isotope ratio was referenced to a belemnite sample collected by Heinz Lowenstam and Harold Urey1 in South Carolina's Pee Dee region. Due to the exhaustion of the sample since then, reference materials that are traceable to the original artefact are used to define the Vienna Pee Dee Belemnite (VPDB) scale for stable carbon isotope analysis2. However, these reference materials have also become exhausted or proven to exhibit unstable composition over time3, mirroring issues with the international prototype of the kilogram that led to a revised International System of Units4. A campaign to elucidate the stable carbon isotope ratio of VPDB is underway5, but independent measurement techniques are required to support it. Here we report an accurate value for the stable carbon isotope ratio inferred from infrared absorption spectroscopy, fulfilling the promise of this fundamentally accurate approach6. Our results agree with a value recently derived from mass spectrometry5, and therefore advance the prospects of SI-traceable isotope analysis. Further, our calibration-free method could improve mass balance calculations and enhance isotopic tracer studies in CO2 source apportionment.
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Affiliation(s)
- Adam J. Fleisher
- Material Measurement Laboratory, National Institute of Standards and Technology, Gaithersburg, MD, USA
- These authors contributed equally: Adam J. Fleisher, Hongming Yi
- To whom correspondence should be addressed: , phone: 301-975-4864, National Institute of Standards and Technology, 100 Bureau Drive, Mailstop 8320, Gaithersburg, MD 20899, USA
| | - Hongming Yi
- Material Measurement Laboratory, National Institute of Standards and Technology, Gaithersburg, MD, USA
- These authors contributed equally: Adam J. Fleisher, Hongming Yi
- Present affiliation: The Department of Civil and Environmental Engineering, Princeton University, Princeton, NJ, USA
| | - Abneesh Srivastava
- Material Measurement Laboratory, National Institute of Standards and Technology, Gaithersburg, MD, USA
| | - Oleg L. Polyansky
- Department of Physics and Astronomy, University College London, London, UK
- Institute of Applied Physics, Russian Academy of Sciences, Nizhny Novgorod, Russia
| | - Nikolai F. Zobov
- Institute of Applied Physics, Russian Academy of Sciences, Nizhny Novgorod, Russia
| | - Joseph T. Hodges
- Material Measurement Laboratory, National Institute of Standards and Technology, Gaithersburg, MD, USA
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9
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Raman Laser Spectrometer: Application to 12C/13C Isotope Identification in CH4 and CO2 Greenhouse Gases. APPLIED SCIENCES-BASEL 2020. [DOI: 10.3390/app10217473] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
A compact Raman laser gas spectrometer is developed. It comprises a high-power green laser at 532.123 nm as an excitation source and a specially designed gas cell with an internal volume of less than 0.6 cm3 that can withstand gas pressures up to 100 atm. The resolution of the spectrometer is ~1 cm−1. The Raman spectra of chemically pure isotopically enriched carbon dioxide (12CO2, 13CO2) and methane (12CH4, 13CH4) gases are studied. The expected limit of detection (LOD) is less than 100 ppm for the isotopologues of CO2 and less than 25 ppm for those of CH4 (at a gas pressure of 50 atm.), making the developed spectrometer promising for studying the sources of emissions of greenhouse gases by resolving their isotopologue composition. We also show the suitability of the spectrometer for Raman spectroscopy of human exhalation.
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10
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Hu CL, Perevalov VI, Cheng CF, Hua TP, Liu AW, Sun YR, Tan Y, Wang J, Hu SM. Optical-Optical Double-Resonance Absorption Spectroscopy of Molecules with Kilohertz Accuracy. J Phys Chem Lett 2020; 11:7843-7848. [PMID: 32866015 DOI: 10.1021/acs.jpclett.0c02136] [Citation(s) in RCA: 9] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/11/2023]
Abstract
Selective pumping and probing of highly excited states of molecules are essential in various studies but are also challenging because of high density of states, weak transition moments, and lack of precise spectroscopy data. We develop a comb-locked cavity-assisted double-resonance spectroscopy (COCA-DR) method for precision measurements using low-power continuous-wave lasers. A high-finesse cavity locked with an optical frequency comb is used to enhance both the pumping power and the probing sensitivity. As a demonstration, Doppler-free stepwise two-photon absorption spectra of CO2 were recorded by using two milliwatt diode lasers (1.60 and 1.67 μm), and the rotation energies in a highly excited state (CO-stretching quanta = 8) were determined with an unprecedented accuracy of a few kilohertz.
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Affiliation(s)
- Chang-Le Hu
- Hefei National Laboratory for Physical Sciences at Microscale, iChem Center, University of Science and Technology of China, Hefei 230026, China
| | - V I Perevalov
- Laboratory of Theoretical Spectroscopy, V. E. Zuev Institute of Atmospheric Optics, Siberian Branch, Russian Academy of Sciences, 1, Akademician Zuev sq., 634055 Tomsk, Russia
| | - Cun-Feng Cheng
- Hefei National Laboratory for Physical Sciences at Microscale, iChem Center, University of Science and Technology of China, Hefei 230026, China
- CAS Center for Excellence in Quantum Information and Quantum Physics, University of Science and Technology of China, Hefei 230026, China
| | - Tian-Peng Hua
- Hefei National Laboratory for Physical Sciences at Microscale, iChem Center, University of Science and Technology of China, Hefei 230026, China
| | - An-Wen Liu
- Hefei National Laboratory for Physical Sciences at Microscale, iChem Center, University of Science and Technology of China, Hefei 230026, China
- CAS Center for Excellence in Quantum Information and Quantum Physics, University of Science and Technology of China, Hefei 230026, China
| | - Yu R Sun
- Hefei National Laboratory for Physical Sciences at Microscale, iChem Center, University of Science and Technology of China, Hefei 230026, China
- CAS Center for Excellence in Quantum Information and Quantum Physics, University of Science and Technology of China, Hefei 230026, China
| | - Yan Tan
- Hefei National Laboratory for Physical Sciences at Microscale, iChem Center, University of Science and Technology of China, Hefei 230026, China
- CAS Center for Excellence in Quantum Information and Quantum Physics, University of Science and Technology of China, Hefei 230026, China
| | - Jin Wang
- Hefei National Laboratory for Physical Sciences at Microscale, iChem Center, University of Science and Technology of China, Hefei 230026, China
- CAS Center for Excellence in Quantum Information and Quantum Physics, University of Science and Technology of China, Hefei 230026, China
| | - Shui-Ming Hu
- Hefei National Laboratory for Physical Sciences at Microscale, iChem Center, University of Science and Technology of China, Hefei 230026, China
- CAS Center for Excellence in Quantum Information and Quantum Physics, University of Science and Technology of China, Hefei 230026, China
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11
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Zhang ZT, Cheng CF, Sun YR, Liu AW, Hu SM. Cavity ring-down spectroscopy based on a comb-locked optical parametric oscillator source. OPTICS EXPRESS 2020; 28:27600-27607. [PMID: 32988050 DOI: 10.1364/oe.404944] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/07/2020] [Accepted: 08/26/2020] [Indexed: 06/11/2023]
Abstract
Spectroscopy of molecules in the mid-infrared (MIR) region has important applications in various fields, such as astronomical observation, environmental detection, and fundamental physics. However, compared to that in the near-infrared, precision spectroscopy in the MIR is often limited by the light source and has not shown full potential in sensitivity. Here we report a cavity ring-down spectroscopy system using a tunable narrow-linewidth optical parametric oscillator, which fulfills the requirement of high sensitivity and high precision in the MIR region. The Lamb-dip spectrum of the N2O molecule at 2.7 μm was measured as a demonstration of spectroscopy in the MIR with kilohertz accuracy.
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12
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Conway EK, Gordon IE, Polyansky OL, Tennyson J. Use of the complete basis set limit for computing highly accurate ab initio dipole moments. J Chem Phys 2020; 152:024105. [DOI: 10.1063/1.5135931] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Affiliation(s)
- Eamon K. Conway
- Harvard & Smithsonian
- Center for Astrophysics, Atomic and Molecular Physics Division, Cambridge, Massachusetts 02138, USA
- Department of Physics and Astronomy, University College London, Gower Street, London WC1E 6BT, United Kingdom
| | - Iouli E. Gordon
- Harvard & Smithsonian
- Center for Astrophysics, Atomic and Molecular Physics Division, Cambridge, Massachusetts 02138, USA
| | - Oleg L. Polyansky
- Department of Physics and Astronomy, University College London, Gower Street, London WC1E 6BT, United Kingdom
| | - Jonathan Tennyson
- Department of Physics and Astronomy, University College London, Gower Street, London WC1E 6BT, United Kingdom
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13
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Wu H, Hu CL, Wang J, Sun YR, Tan Y, Liu AW, Hu SM. A well-isolated vibrational state of CO2verified by near-infrared saturated spectroscopy with kHz accuracy. Phys Chem Chem Phys 2020; 22:2841-2848. [DOI: 10.1039/c9cp05121j] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Quantitative determination of atmospheric CO2concentration by remote sensing relies on accurate line parameters.
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Affiliation(s)
- Hao Wu
- Hefei National Laboratory for Physical Sciences at Microscale
- iChem Center
- University of Science and Technology of China
- Hefei
- China
| | - Chang-Le Hu
- Hefei National Laboratory for Physical Sciences at Microscale
- iChem Center
- University of Science and Technology of China
- Hefei
- China
| | - Jin Wang
- Hefei National Laboratory for Physical Sciences at Microscale
- iChem Center
- University of Science and Technology of China
- Hefei
- China
| | - Yu R. Sun
- Hefei National Laboratory for Physical Sciences at Microscale
- iChem Center
- University of Science and Technology of China
- Hefei
- China
| | - Yan Tan
- Hefei National Laboratory for Physical Sciences at Microscale
- iChem Center
- University of Science and Technology of China
- Hefei
- China
| | - An-Wen Liu
- Hefei National Laboratory for Physical Sciences at Microscale
- iChem Center
- University of Science and Technology of China
- Hefei
- China
| | - Shui-Ming Hu
- Hefei National Laboratory for Physical Sciences at Microscale
- iChem Center
- University of Science and Technology of China
- Hefei
- China
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14
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Fleurbaey H, Yi H, Adkins EM, Fleisher AJ, Hodges JT. Cavity ring-down spectroscopy of CO 2 near λ = 2.06 μm: Accurate transition intensities for the Orbiting Carbon Observatory-2 (OCO-2) "strong band". JOURNAL OF QUANTITATIVE SPECTROSCOPY & RADIATIVE TRANSFER 2020; 252:https://doi.org/10.1016/j.jqsrt.2020.107104. [PMID: 33100382 DOI: 10.1016/j.jqsrt.2020.107104] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/22/2023]
Abstract
The λ = 2.06 μm absorption band of CO2 is widely used for the remote sensing of atmospheric carbon dioxide, making it relevant to many important top-down measurements of carbon flux. The forward models used in the retrieval algorithms employed in these measurements require increasingly accurate line intensity and line shape data from which absorption cross-sections can be computed. To overcome accuracy limitations of existing line lists, we used frequency-stabilized cavity ring-down spectroscopy to measure 39 transitions in the 12C16O2 absorption band. The line intensities were measured with an estimated relative combined standard uncertainty of u r = 0.08 %. We predicted the J-dependence of the measured intensities using two theoretical models: a one-dimensional spectroscopic model with Herman-Wallis rotation-vibration corrections, and a line-by-line ab initio dipole moment surface model [Zak et al. JQSRT 2016;177:31-42]. For the second approach, we fit only a single factor to rescale the theoretical integrated band intensity to be consistent with the measured intensities. We find that the latter approach yields an equally adequate representation of the fitted J-dependent intensity data and provides the most physically general representation of the results. Our recommended value for the integrated band intensity equal to 7.183 × 10-21 cm molecule-1 ± 6 × 10-24 cm molecule-1 is based on the rescaled ab initio model and corresponds to a fitted scale factor of 1.0069 ± 0.0002. Comparisons of literature intensity values to our results reveal systematic deviations ranging from -1.16 % to +0.33 %.
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Affiliation(s)
- Hélène Fleurbaey
- Material Measurement Laboratory, National Institute of Standards and Technology, 100 Bureau Drive, Gaithersburg, MD 20899, USA
| | - Hongming Yi
- Material Measurement Laboratory, National Institute of Standards and Technology, 100 Bureau Drive, Gaithersburg, MD 20899, USA
| | - Erin M Adkins
- Material Measurement Laboratory, National Institute of Standards and Technology, 100 Bureau Drive, Gaithersburg, MD 20899, USA
| | - Adam J Fleisher
- Material Measurement Laboratory, National Institute of Standards and Technology, 100 Bureau Drive, Gaithersburg, MD 20899, USA
| | - Joseph T Hodges
- Material Measurement Laboratory, National Institute of Standards and Technology, 100 Bureau Drive, Gaithersburg, MD 20899, USA
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15
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Wu H, Stolarczyk N, Liu QH, Cheng CF, Hua TP, Sun YR, Hu SM. Comb-locked cavity ring-down spectroscopy with variable temperature. OPTICS EXPRESS 2019; 27:37559-37567. [PMID: 31878535 DOI: 10.1364/oe.376572] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/28/2019] [Accepted: 12/04/2019] [Indexed: 06/10/2023]
Abstract
Temperature dependence of molecular absorption line shape is important information for spectroscopic studies and applications. In this work, we report a comb-locked cavity ring-down spectrometer employing a cryogenic cooler to perform absorption spectroscopy measurements at temperatures between 40 K and 300 K. As a demonstration, we recorded the spectrum of the R(0) line in the (2-0) band of HD at 46 K. The temperature was also confirmed by the Doppler width of the HD line. Spectra of CH4 near 1.394 μm were also recorded in a wide temperature range of 70-300 K. Lower-state energies of methane lines were analyzed by fitting these spectra, which can be directly compared with the HITRAN and TheoReTS databases. Considerable deviations were observed, indicating the need to investigate the assignments of the methane lines in this region.
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16
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Guo R, Teng J, Cao K, Dong H, Cui W, Zhang T. Comb-assisted, Pound-Drever-Hall locked cavity ring-down spectrometer for high-performance retrieval of transition parameters. OPTICS EXPRESS 2019; 27:31850-31863. [PMID: 31684409 DOI: 10.1364/oe.27.031850] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/30/2019] [Accepted: 09/30/2019] [Indexed: 06/10/2023]
Abstract
Fast and high-performance cavity ring-down spectrometer (CRDS) is highly desired to precisely extract spectral parameters. In this paper, we present our comb-assisted Pound-Drever-Hall (PDH) locked CRDS setup, aiming to retrieve molecular parameters. In the setup, a dynamic feedback is used to keep the tight PDH locking even under strong absorption in the spectral measurement. PDH light and probing light enter the ring-down cavity simultaneously under orthogonal polarization, which enables a fast acquisition of ring-down events without interrupting PDH locking. Ultra-stable cavity temperature is realized, which has an accuracy below 0.5 mK in 27 minutes. The optical frequency comb (OFC) system is developed to rapidly and automatically measure the frequency axis with a relatively wide beat-note range. The minimum detectable absorption coefficient and noise-equivalent absorption coefficient (NEA) are 7.6×10-12cm-1 and 5.3×10-12cm-1Hz-1/2, respectively. The spectrometer is implemented to measure CO2 transition and extract line parameters. The uncertainty for line position is evaluated to be 120 kHz. An accuracy of 0.31% for line intensity is beneficial to the precise determination of CO2 content for the purpose of environment protection and other applications.
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17
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Fleisher AJ, Adkins EM, Reed ZD, Yi H, Long DA, Fleurbaey HM, Hodges JT. Twenty-Five-Fold Reduction in Measurement Uncertainty for a Molecular Line Intensity. PHYSICAL REVIEW LETTERS 2019; 123:043001. [PMID: 31491247 PMCID: PMC6767615 DOI: 10.1103/physrevlett.123.043001] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/24/2019] [Revised: 06/06/2019] [Indexed: 05/06/2023]
Abstract
To accurately attribute sources and sinks of molecules like CO_{2}, remote sensing missions require line intensities (S) with relative uncertainties u_{r}(S)<0.1%. However, discrepancies in S of ≈1% are common when comparing different experiments, thus limiting their potential impact. Here we report a cavity ring-down spectroscopy multi-instrument comparison which revealed that the hardware used to digitize analog ring-down signals caused variability in spectral integrals which yield S. Our refined approach improved measurement accuracy 25-fold, resulting in u_{r}(S)=0.06%.
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Affiliation(s)
- Adam J Fleisher
- National Institute of Standards and Technology, 100 Bureau Drive, Gaithersburg, Maryland 20899, USA
| | - Erin M Adkins
- National Institute of Standards and Technology, 100 Bureau Drive, Gaithersburg, Maryland 20899, USA
| | - Zachary D Reed
- National Institute of Standards and Technology, 100 Bureau Drive, Gaithersburg, Maryland 20899, USA
| | - Hongming Yi
- National Institute of Standards and Technology, 100 Bureau Drive, Gaithersburg, Maryland 20899, USA
| | - David A Long
- National Institute of Standards and Technology, 100 Bureau Drive, Gaithersburg, Maryland 20899, USA
| | - Hélène M Fleurbaey
- National Institute of Standards and Technology, 100 Bureau Drive, Gaithersburg, Maryland 20899, USA
| | - Joseph T Hodges
- National Institute of Standards and Technology, 100 Bureau Drive, Gaithersburg, Maryland 20899, USA
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18
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Cygan A, Wcisło P, Wójtewicz S, Kowzan G, Zaborowski M, Charczun D, Bielska K, Trawiński RS, Ciuryło R, Masłowski P, Lisak D. High-accuracy and wide dynamic range frequency-based dispersion spectroscopy in an optical cavity. OPTICS EXPRESS 2019; 27:21810-21821. [PMID: 31510251 DOI: 10.1364/oe.27.021810] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/21/2019] [Accepted: 06/27/2019] [Indexed: 06/10/2023]
Abstract
A spectroscopic method free from systematic errors is desired for many challenging applications of gas detection. Although existing cavity-enhanced techniques exhibit very high precision, their accuracy strongly depends on propagation of the light amplitude through an optical system and its detection. Here, we demonstrate that the frequency-based molecular dispersion spectroscopy, involving sub-Hz-level precision in frequency measurements of optical cavity resonances, leads to sub-per-mille accuracy and a wide dynamic range, both previously unattainable by any other spectroscopic technique. The method offers great sensitivity of 5×10-11 cm-1, high speed, limited only by the fundamental response time of the cavity, and traceability of both axes of the spectrum to the primary frequency standard. All these features are necessary for convenient realization of comprehensive molecular spectroscopy from Doppler up to collisional regime without changing the spectroscopic method and modification of the experimental setup. Moreover, the presented approach does not require linear, high-bandwidth nor phase-sensitive detectors and can be directly implemented in existing cavity-enhanced spectrometers utilizing either continuous-wave or coherent broadband radiation. We experimentally prove the predominance of frequency-based spectroscopy over intensity-based one. Our results motivate replacement of intensity-based absorption spectroscopy with a pure frequency-based dispersion one in applications where the highest accuracy is required.
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Lin H, Yang L, Feng XJ, Zhang JT. Discovery of New Lines in the R9 Multiplet of the 2v_{3} Band of ^{12}CH_{4}. PHYSICAL REVIEW LETTERS 2019; 122:013002. [PMID: 31012704 DOI: 10.1103/physrevlett.122.013002] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/23/2018] [Indexed: 06/09/2023]
Abstract
We present the first results for resolving methane (CH_{4}) line transition frequencies down to the kilohertz level for overlapping lines using comb-linked cavity ring-down spectroscopy, while most available laboratory measurements, having resolution at the megahertz level, cannot separate merged lines. To demonstrate the technique, Lamb-dip spectra and linear-absorption spectra were used to identify overlapped lines of vibration-rotation spectra in the R9 multiplet of the 2v_{3} band. Three new weak lines were found for the first time. The experimental methods are extensible to other important bands of CH_{4} and many other gas-phase molecules, and should provide a more detailed understanding of molecular structure and line parameters for future high-precision studies.
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Affiliation(s)
- H Lin
- Division of Thermophysics and Process Measurements, National Institute of Metrology, 18 Bei San Huang Dong Lu, Chao Yang District, Beijing 100029, China
| | - L Yang
- Division of Thermophysics and Process Measurements, National Institute of Metrology, 18 Bei San Huang Dong Lu, Chao Yang District, Beijing 100029, China
- Department of Precision Instrument, Tsinghua University, 1 Qing Hua Yuan, Hai Dian District, Beijing 100084, China
| | - X J Feng
- Division of Thermophysics and Process Measurements, National Institute of Metrology, 18 Bei San Huang Dong Lu, Chao Yang District, Beijing 100029, China
| | - J T Zhang
- Division of Thermophysics and Process Measurements, National Institute of Metrology, 18 Bei San Huang Dong Lu, Chao Yang District, Beijing 100029, China
- Department of Precision Instrument, Tsinghua University, 1 Qing Hua Yuan, Hai Dian District, Beijing 100084, China
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20
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Coles PA, Yurchenko SN, Kovacich RP, Hobby J, Tennyson J. A variationally computed room temperature line list for AsH3. Phys Chem Chem Phys 2019; 21:3264-3277. [DOI: 10.1039/c8cp07110a] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Calculations are reported on the rotation–vibration energy levels of the arsine molecule with associated transition intensities.
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Affiliation(s)
- Phillip A. Coles
- Department of Physics & Astronomy
- University College London
- London WC1E 6BT
- UK
| | | | | | - James Hobby
- Servomex Ltd
- Millbrook Industrial Estate
- Crowborough TN6 3FB
- UK
| | - Jonathan Tennyson
- Department of Physics & Astronomy
- University College London
- London WC1E 6BT
- UK
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21
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Nikitin AV, Protasevich AE, Rey M, Tyuterev VG. Highly excited vibrational levels of methane up to 10 300 cm -1: Comparative study of variational methods. J Chem Phys 2018; 149:124305. [PMID: 30278662 DOI: 10.1063/1.5042154] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/20/2023] Open
Abstract
In this work, we report calculated vibrational energy levels of the methane molecule up to 10 300 cm-1. Two potential energy surfaces constructed in quite different coordinate systems with different analytical representations are employed in order to evaluate the uncertainty of vibrational predictions. To calculate methane energy levels, we used two independent techniques of the variational method. One method uses an exact kinetic energy operator in internal curvilinear coordinates. Another one uses an expansion of Eckart-Watson nuclear motion Hamiltonian in rectilinear normal coordinates. In the Icosad range (up to five vibrational quanta bands-below 7800 cm-1), the RMS standard deviations between calculated and observed energy levels were 0.22 cm-1 and 0.41 cm-1 for these two quite different approaches. For experimentally well-known 3v3 sub-levels, the calculation accuracy is estimated to be ∼1 cm-1. In the Triacontad range (7660-9188 cm-1), the average error of the calculation is about 0.5 cm-1. The accuracy and convergence issues for higher energy ranges are discussed.
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Affiliation(s)
- Andrei V Nikitin
- V.E. Zuev Institute of Atmospheric Optics, Russian Academy of Sciences, 1, Akademichesky Avenue, 634055 Tomsk, Russian Federation
| | - Alexander E Protasevich
- V.E. Zuev Institute of Atmospheric Optics, Russian Academy of Sciences, 1, Akademichesky Avenue, 634055 Tomsk, Russian Federation
| | - Michael Rey
- Groupe de Spectrométrie Moléculaire et Atmosphérique, UMR CNRS 7331, Université de Reims, U.F.R. Sciences, B.P. 1039, 51687 Reims Cedex 2, France
| | - Vladimir G Tyuterev
- Groupe de Spectrométrie Moléculaire et Atmosphérique, UMR CNRS 7331, Université de Reims, U.F.R. Sciences, B.P. 1039, 51687 Reims Cedex 2, France
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22
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Guay P, Genest J, Fleisher AJ. Precision spectroscopy of H 13CN using a free-running, all-fiber dual electro-optic frequency comb system. OPTICS LETTERS 2018. [PMID: 29543247 PMCID: PMC5962960 DOI: 10.1364/ol.43.001407] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/17/2023]
Abstract
We demonstrate the precision molecular spectroscopy of H13CN using a free-running, all-fiber dual electro-optic frequency comb system. Successive interferograms, acquired at a rate of Δfrep=1 MHz, were phase-corrected in post-processing, averaged, and normalized to yield the complex transmission spectrum of several transitions within the 2ν1H13CN band centered near λ=1545 nm. With spectral signal-to-noise ratios as high as 326:1 achieved in 2 ms of integration time, we report accurate measurements of H13CN transition intensities which will aid in the study of extreme astrophysical environments.
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Affiliation(s)
- Philippe Guay
- National Institute of Standards and Technology, 100 Bureau Drive, Gaithersburg, MD 20899
- Centre d’optique, photonique et laser, Université Laval, Québec, QC, G1V 0A6, Canada
| | - Jérôme Genest
- Centre d’optique, photonique et laser, Université Laval, Québec, QC, G1V 0A6, Canada
| | - Adam J. Fleisher
- National Institute of Standards and Technology, 100 Bureau Drive, Gaithersburg, MD 20899
- Corresponding author:
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23
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Mizus II, Kyuberis AA, Zobov NF, Makhnev VY, Polyansky OL, Tennyson J. High-accuracy water potential energy surface for the calculation of infrared spectra. PHILOSOPHICAL TRANSACTIONS. SERIES A, MATHEMATICAL, PHYSICAL, AND ENGINEERING SCIENCES 2018; 376:rsta.2017.0149. [PMID: 29431677 PMCID: PMC5805917 DOI: 10.1098/rsta.2017.0149] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Accepted: 11/30/2017] [Indexed: 05/06/2023]
Abstract
Transition intensities for small molecules such as water and CO2 can now be computed with such high accuracy that they are being used to systematically replace measurements in standard databases. These calculations use high-accuracy ab initio dipole moment surfaces and wave functions from spectroscopically determined potential energy surfaces (PESs). Here, an extra high-accuracy PES of the water molecule (H216O) is produced starting from an ab initio PES which is then refined to empirical rovibrational energy levels. Variational nuclear motion calculations using this PES reproduce the fitted energy levels with a standard deviation of 0.011 cm-1, approximately three times their stated uncertainty. The use of wave functions computed with this refined PES is found to improve the predicted transition intensities for selected (problematic) transitions. A new room temperature line list for H216O is presented. It is suggested that the associated set of line intensities is the most accurate available to date for this species.This article is part of the theme issue 'Modern theoretical chemistry'.
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Affiliation(s)
- Irina I Mizus
- Institute of Applied Physics, Russian Academy of Science, Ulyanov Street 46, Nizhny Novgorod 603950, Russia
| | - Aleksandra A Kyuberis
- Institute of Applied Physics, Russian Academy of Science, Ulyanov Street 46, Nizhny Novgorod 603950, Russia
| | - Nikolai F Zobov
- Institute of Applied Physics, Russian Academy of Science, Ulyanov Street 46, Nizhny Novgorod 603950, Russia
| | - Vladimir Yu Makhnev
- Institute of Applied Physics, Russian Academy of Science, Ulyanov Street 46, Nizhny Novgorod 603950, Russia
| | - Oleg L Polyansky
- Department of Physics and Astronomy, University College London, Gower Street, London WC1E 6BT, UK
| | - Jonathan Tennyson
- Department of Physics and Astronomy, University College London, Gower Street, London WC1E 6BT, UK
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24
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Yi H, Liu Q, Gameson L, Fleisher AJ, Hodges JT. High-accuracy 12C 16O 2 line intensities in the 2 μm wavelength region measured by frequency-stabilized cavity ring-down spectroscopy. JOURNAL OF QUANTITATIVE SPECTROSCOPY & RADIATIVE TRANSFER 2018; 206:367-377. [PMID: 29731521 PMCID: PMC5930389 DOI: 10.1016/j.jqsrt.2017.12.008] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/22/2023]
Abstract
Reported here are highly accurate, experimentally measured ro-vibrational transition intensities for the R-branch of the (20012) - (00001) 12C16O2 band near λ = 2 μm. Measurements were performed by a frequency-stabilized cavity ring-down spectroscopy (FS-CRDS) instrument designed to achieve precision molecular spectroscopy in this important region of the infrared. Through careful control and traceable characterization of CO2 sample conditions, and through high-fidelity measurements spanning several months in time, we achieve relative standard uncertainties for the reported transition intensities between 0.15 % and 0.46 %. Such high accuracy spectroscopy is shown to provide a stringent test of calculated potential energy and ab initio dipole moment surfaces, and therefore transition intensities calculated from first principles.
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25
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Fleisher AJ, Long DA, Liu Q, Gameson L, Hodges JT. Optical Measurement of Radiocarbon below Unity Fraction Modern by Linear Absorption Spectroscopy. J Phys Chem Lett 2017; 8:4550-4556. [PMID: 28880564 PMCID: PMC5725230 DOI: 10.1021/acs.jpclett.7b02105] [Citation(s) in RCA: 28] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 05/22/2023]
Abstract
High-precision measurements of radiocarbon (14C) near or below a fraction modern 14C of 1 (F14C ≤ 1) are challenging and costly. An accurate, ultrasensitive linear absorption approach to detecting 14C would provide a simple and robust benchtop alternative to off-site accelerator mass spectrometry facilities. Here we report the quantitative measurement of 14C in gas-phase samples of CO2 with F14C < 1 using cavity ring-down spectroscopy in the linear absorption regime. Repeated analysis of CO2 derived from the combustion of either biogenic or petrogenic sources revealed a robust ability to differentiate samples with F14C < 1. With a combined uncertainty of 14C/12C = 130 fmol/mol (F14C = 0.11), initial performance of the calibration-free instrument is sufficient to investigate a variety of applications in radiocarbon measurement science including the study of biofuels and bioplastics, illicitly traded specimens, bomb dating, and atmospheric transport.
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26
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Zak EJ, Tennyson J. Ro-vibronic transition intensities for triatomic molecules from the exact kinetic energy operator; electronic spectrum for the C̃ 1B 2 ← X̃ 1A 1 transition in SO 2. J Chem Phys 2017; 147:094305. [PMID: 28886637 DOI: 10.1063/1.4986943] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/16/2022] Open
Abstract
A procedure for calculating ro-vibronic transition intensities for triatomic molecules within the Born-Oppenheimer approximation is reported. Ro-vibrational energy levels and wavefunctions are obtained with the DVR3D suite, which solves the nuclear motion problem with an exact kinetic energy operator. Absolute transition intensities are calculated both with the Franck-Condon approximation and with a full transition dipole moment surface. The theoretical scheme is tested on C̃ 1B2 ← X̃ 1A1 ro-vibronic transitions of SO2. Ab initio potential energy and dipole moment surfaces are generated for this purpose. The calculated ro-vibronic transition intensities and cross sections are compared with the available experimental and theoretical data.
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Affiliation(s)
- Emil J Zak
- Department of Physics and Astronomy, University College London, London WC1E 6BT, United Kingdom
| | - Jonathan Tennyson
- Department of Physics and Astronomy, University College London, London WC1E 6BT, United Kingdom
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27
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Tennyson J, Yurchenko SN. Laboratory spectra of hot molecules: Data needs for hot super-Earth exoplanets. ACTA ACUST UNITED AC 2017. [DOI: 10.1016/j.molap.2017.05.002] [Citation(s) in RCA: 64] [Impact Index Per Article: 9.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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28
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Odintsova TA, Fasci E, Moretti L, Zak EJ, Polyansky OL, Tennyson J, Gianfrani L, Castrillo A. Highly accurate intensity factors of pure CO2 lines near 2 μm. J Chem Phys 2017; 146:244309. [DOI: 10.1063/1.4989925] [Citation(s) in RCA: 23] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/08/2023] Open
Affiliation(s)
- T. A. Odintsova
- Dipartimento di Matematica e Fisica, Università degli Studi della Campania “Luigi Vanvitelli,” Viale Lincoln 5, 81100 Caserta, Italy
| | - E. Fasci
- Dipartimento di Matematica e Fisica, Università degli Studi della Campania “Luigi Vanvitelli,” Viale Lincoln 5, 81100 Caserta, Italy
| | - L. Moretti
- Dipartimento di Matematica e Fisica, Università degli Studi della Campania “Luigi Vanvitelli,” Viale Lincoln 5, 81100 Caserta, Italy
| | - E. J. Zak
- Department of Physics and Astronomy, University College London, London WC1E 6BT, United Kingdom
| | - O. L. Polyansky
- Department of Physics and Astronomy, University College London, London WC1E 6BT, United Kingdom
| | - J. Tennyson
- Department of Physics and Astronomy, University College London, London WC1E 6BT, United Kingdom
| | - L. Gianfrani
- Dipartimento di Matematica e Fisica, Università degli Studi della Campania “Luigi Vanvitelli,” Viale Lincoln 5, 81100 Caserta, Italy
| | - A. Castrillo
- Dipartimento di Matematica e Fisica, Università degli Studi della Campania “Luigi Vanvitelli,” Viale Lincoln 5, 81100 Caserta, Italy
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29
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Tyuterev VG, Kochanov RV, Tashkun SA. Accurateab initiodipole moment surfaces of ozone: First principle intensity predictions for rotationally resolved spectra in a large range of overtone and combination bands. J Chem Phys 2017; 146:064304. [DOI: 10.1063/1.4973977] [Citation(s) in RCA: 41] [Impact Index Per Article: 5.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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30
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Truong GW, Waxman EM, Cossel KC, Baumann E, Klose A, Giorgetta FR, Swann WC, Newbury NR, Coddington I. Accurate frequency referencing for fieldable dual-comb spectroscopy. OPTICS EXPRESS 2016; 24:30495-30504. [PMID: 28059397 DOI: 10.1364/oe.24.030495] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/06/2023]
Abstract
We describe a dual-comb spectrometer that can operate independently of laboratory-based rf and optical frequency references but is nevertheless capable of ultra-high spectral resolution, high SNR, and frequency-accurate spectral measurements. The instrument is based on a "bootstrapped" frequency referencing scheme in which short-term optical phase coherence between combs is attained by referencing each to a free-running diode laser, whilst high frequency resolution and long-term accuracy is derived from a stable quartz oscillator. The sensitivity, stability and accuracy of this spectrometer were characterized using a multipass cell. We demonstrate comb-resolved spectra spanning from 140 THz (2.14 µm, 4670 cm-1) to 184 THz (1.63 µm, 6140 cm-1) in the near infrared with a frequency sampling of 200 MHz (0.0067 cm-1) and ~1 MHz frequency accuracy. High resolution spectra of water and carbon dioxide transitions at 1.77 µm, 1.96 µm and 2.06 µm show that the molecular transmission acquired with this system operating in the field-mode did not deviate from those measured when it was referenced to a maser and cavity-stabilized laser to within 5.6 × 10-4. When optimized for carbon dioxide quantification at 1.60 µm, a sensitivity of 2.8 ppm-km at 1 s integration time, improving to 0.10 ppm-km at 13 minutes of integration time was achieved.
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31
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Tennyson J. Perspective: Accurate ro-vibrational calculations on small molecules. J Chem Phys 2016; 145:120901. [DOI: 10.1063/1.4962907] [Citation(s) in RCA: 52] [Impact Index Per Article: 6.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022] Open
Affiliation(s)
- Jonathan Tennyson
- Department of Physics and Astronomy, University College London, Gower Street, WC1E 6BT London, United Kingdom
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32
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Delahaye T, Maxwell S, Reed Z, Lin H, Hodges J, Sung K, Devi V, Warneke T, Spietz P, Tran H. Precise methane absorption measurements in the 1.64 μm spectral region for the MERLIN mission. JOURNAL OF GEOPHYSICAL RESEARCH. ATMOSPHERES : JGR 2016; 121:7360-7370. [PMID: 27551656 PMCID: PMC4990787 DOI: 10.1002/2016jd025024] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/06/2023]
Abstract
In this article we describe a high-precision laboratory measurement targeting the R(6) manifold of the 2ν3 band of 12CH4. Accurate physical models of this absorption spectrum will be required by the Franco-German, Methane Remote Sensing LIDAR (MERLIN) space mission for retrievals of atmospheric methane. The analysis uses the Hartmann-Tran profile for modeling line shape and also includes line-mixing effects. To this end, six high-resolution and high signal-to-noise absorption spectra of air-broadened methane were recorded using a frequency-stabilized cavity ring-down spectroscopy apparatus. Sample conditions corresponded to room temperature and spanned total sample pressures of 40 hPa - 1013 hPa with methane molar fractions between 1 μmol mol-1 and 12 μmol mol-1. All spectroscopic model parameters were simultaneously adjusted in a multispectrum nonlinear least-squares fit to the six measured spectra. Comparison of the fitted model to the measured spectra reveals the ability to calculate the room-temperature, methane absorption coefficient to better than 0.1% at the on-line position of the MERLIN mission. This is the first time that such fidelity has been reached in modeling methane absorption in the investigated spectral region, fulfilling the accuracy requirements of the MERLIN mission. We also found excellent agreement when comparing the present results with measurements obtained over different pressure conditions and using other laboratory techniques. Finally, we also evaluated the impact of these new spectral parameters on atmospheric transmissions spectra calculations.
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Affiliation(s)
- T. Delahaye
- Laboratoire Interuniversitaire des Systèmes Atmosphériques (LISA, CNRS UMR 7583), Université Paris Est Créteil, Université Paris Diderot, Institut Pierre-Simon Laplace, 94010 Créteil
| | - S.E. Maxwell
- National Institute of Standards and Technology, 100 Bureau Drive, Gaithersburg, MD 20899, USA
| | - Z.D. Reed
- National Institute of Standards and Technology, 100 Bureau Drive, Gaithersburg, MD 20899, USA
| | - H. Lin
- National Institute of Standards and Technology, 100 Bureau Drive, Gaithersburg, MD 20899, USA
- National Institute of Metrology, Beijing 100029, China
| | - J.T. Hodges
- National Institute of Standards and Technology, 100 Bureau Drive, Gaithersburg, MD 20899, USA
| | - K. Sung
- Jet Propulsion Laboratory, California Institute of Technology, 4800 Oak Grove Drive, Pasadena, CA 91109, USA
| | - V.M. Devi
- Department of Physics, the College of William and Mary, Box 8795, Williamsburg, VA 23187, USA
| | - T. Warneke
- Institute of Environmental Physics, University of Bremen, Otto-Hahn-Allee 1, 28359 Bremen, Germany
| | - P. Spietz
- DLR German Aerospace Center, Institute of Space Systems, Robert-Hooke-Str., 7, 28359 Bremen, Germany
| | - H. Tran
- Laboratoire Interuniversitaire des Systèmes Atmosphériques (LISA, CNRS UMR 7583), Université Paris Est Créteil, Université Paris Diderot, Institut Pierre-Simon Laplace, 94010 Créteil
- corresponding author:
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Cygan A, Wójtewicz S, Kowzan G, Zaborowski M, Wcisło P, Nawrocki J, Krehlik P, Śliwczyński Ł, Lipiński M, Masłowski P, Ciuryło R, Lisak D. Absolute molecular transition frequencies measured by three cavity-enhanced spectroscopy techniques. J Chem Phys 2016; 144:214202. [DOI: 10.1063/1.4952651] [Citation(s) in RCA: 33] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/27/2023] Open
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