1
|
Peltola J, Seal P, Inkilä A, Eskola A. Time-resolved, broadband UV-absorption spectrometry measurements of Criegee intermediate kinetics using a new photolytic precursor: unimolecular decomposition of CH 2OO and its reaction with formic acid. Phys Chem Chem Phys 2020; 22:11797-11808. [PMID: 32347242 DOI: 10.1039/d0cp00302f] [Citation(s) in RCA: 9] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
We present a time-resolved broadband cavity-enhanced UV-absorption spectrometer apparatus that we have constructed and utilized for temperature- and pressure-dependent kinetic measurements of formaldehyde oxide (CH2OO) reactions. We also introduce and utilize a new photolytic precursor, bromoiodomethane (CH2IBr), which photolysis at 213 nm in presence of O2 produces CH2OO. Importantly, this precursor appears to be free from secondary reactions that may regenerate CH2OO in kinetic experiments. The unimolecular decomposition rate coefficient of CH2OO has been measured over wide pressure (5-400 Torr) and temperature (296-600 K) ranges and master equation simulations of the decomposition kinetics have been performed using MESMER program. The MESMER simulations of the experimental data with the calculated zero-point energy corrected transition state energy 85.9 kJ mol-1 for decomposition required no adjustment and returned 〈ΔE〉down = 123.2 × (T/298 K)0.74 cm-1 for temperature-dependent exponential-down model of the collisional energy transfer in He. A very good agreement between results of simulations and experiments is obtained. The results are compared with the previously reported unimolecular decomposition study by Stone et al. (Phys. Chem. Chem. Phys., 2018, 20, 24940-24954). Current master equation simulations suggest about 61% decomposition yield for the predominant H2 + CO2 channel, whereas the yields of two other channels, H2O + CO, and HCO + OH, are sensitive on the parameters involved in the simulations. The kinetics of CH2OO reaction with formic acid has also been investigated as function of pressure (5-150 Torr) and temperature (296-458 K). The bimolecular rate coefficient for CH2OO + HCOOH reaction shows a negative temperature dependency, decreasing from (1.0 ± 0.03) × 10-10 cm3 molecule-1 s-1 at 296 K to (0.47 ± 0.05) × 10-10 cm3 molecule-1 s-1 at 458 K with an Arrhenius activation energy of -4.9 ± 1.6 kJ mol-1, where statistical uncertainties shown are 2σ. Estimated overall uncertainty in the measured rate coefficients is about ±20%. Current bimolecular rate coefficient at room temperature agrees with the previously reported rate coefficients from the direct kinetic experiments. The reaction is found to be pressure independent over the range between 5 and 150 Torr at 296 K in He.
Collapse
Affiliation(s)
- Jari Peltola
- Department of Chemistry, University of Helsinki, P.O. Box 55 (A.I. Virtasen aukio 1), FI-00014, Helsinki, Finland.
| | | | | | | |
Collapse
|
2
|
Zheng K, Zheng C, Liu Z, He Q, Du Q, Zhang Y, Wang Y, Tittel FK. Near-infrared broadband cavity-enhanced sensor system for methane detection using a wavelet-denoising assisted Fourier-transform spectrometer. Analyst 2018; 143:4699-4706. [PMID: 30183029 DOI: 10.1039/c8an01290c] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The majority of broadband cavity-enhanced systems are used to detect trace gas species in the visible spectral range.
Collapse
Affiliation(s)
- Kaiyuan Zheng
- State Key Laboratory of Integrated Optoelectronics
- College of Electronic Science and Engineering
- Jilin University
- Changchun 130012
- China
| | - Chuantao Zheng
- State Key Laboratory of Integrated Optoelectronics
- College of Electronic Science and Engineering
- Jilin University
- Changchun 130012
- China
| | - Zidi Liu
- State Key Laboratory of Integrated Optoelectronics
- College of Electronic Science and Engineering
- Jilin University
- Changchun 130012
- China
| | - Qixin He
- State Key Laboratory of Integrated Optoelectronics
- College of Electronic Science and Engineering
- Jilin University
- Changchun 130012
- China
| | - Qiaoling Du
- State Key Laboratory of Integrated Optoelectronics
- College of Electronic Science and Engineering
- Jilin University
- Changchun 130012
- China
| | - Yu Zhang
- State Key Laboratory of Integrated Optoelectronics
- College of Electronic Science and Engineering
- Jilin University
- Changchun 130012
- China
| | - Yiding Wang
- State Key Laboratory of Integrated Optoelectronics
- College of Electronic Science and Engineering
- Jilin University
- Changchun 130012
- China
| | - Frank K. Tittel
- Department of Electrical and Computer Engineering
- Rice University
- Houston
- USA
| |
Collapse
|
3
|
Sun M, Jiang C, Gong Z, Zhao X, Chen Z, Wang Z, Kang M, Li Y, Wang C. A fully integrated standalone portable cavity ringdown breath acetone analyzer. THE REVIEW OF SCIENTIFIC INSTRUMENTS 2015; 86:095003. [PMID: 26429471 DOI: 10.1063/1.4930121] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/05/2023]
Abstract
Breath analysis is a promising new technique for nonintrusive disease diagnosis and metabolic status monitoring. One challenging issue in using a breath biomarker for potential particular disease screening is to find a quantitative relationship between the concentration of the breath biomarker and clinical diagnostic parameters of the specific disease. In order to address this issue, we need a new instrument that is capable of conducting real-time, online breath analysis with high data throughput, so that a large scale of clinical test (more subjects) can be achieved in a short period of time. In this work, we report a fully integrated, standalone, portable analyzer based on the cavity ringdown spectroscopy technique for near-real time, online breath acetone measurements. The performance of the portable analyzer in measurements of breath acetone was interrogated and validated by using the certificated gas chromatography-mass spectrometry. The results show that this new analyzer is useful for reliable online (online introduction of a breath sample without pre-treatment) breath acetone analysis with high sensitivity (57 ppb) and high data throughput (one data per second). Subsequently, the validated breath analyzer was employed for acetone measurements in 119 human subjects under various situations. The instrument design, packaging, specifications, and future improvements were also described. From an optical ringdown cavity operated by the lab-set electronics reported previously to this fully integrated standalone new instrument, we have enabled a new scientific tool suited for large scales of breath acetone analysis and created an instrument platform that can even be adopted for study of other breath biomarkers by using different lasers and ringdown mirrors covering corresponding spectral fingerprints.
Collapse
Affiliation(s)
- Meixiu Sun
- Laser Medicine Laboratory, Institute of Biomedical Engineering, Chinese Academy of Medical Sciences and Peking Union Medical College, Tianjin 300192, China
| | - Chenyu Jiang
- Laser Medicine Laboratory, Institute of Biomedical Engineering, Chinese Academy of Medical Sciences and Peking Union Medical College, Tianjin 300192, China
| | - Zhiyong Gong
- Laser Medicine Laboratory, Institute of Biomedical Engineering, Chinese Academy of Medical Sciences and Peking Union Medical College, Tianjin 300192, China
| | - Xiaomeng Zhao
- Laser Medicine Laboratory, Institute of Biomedical Engineering, Chinese Academy of Medical Sciences and Peking Union Medical College, Tianjin 300192, China
| | - Zhuying Chen
- Laser Medicine Laboratory, Institute of Biomedical Engineering, Chinese Academy of Medical Sciences and Peking Union Medical College, Tianjin 300192, China
| | - Zhennan Wang
- Laser Medicine Laboratory, Institute of Biomedical Engineering, Chinese Academy of Medical Sciences and Peking Union Medical College, Tianjin 300192, China
| | - Meiling Kang
- Laser Medicine Laboratory, Institute of Biomedical Engineering, Chinese Academy of Medical Sciences and Peking Union Medical College, Tianjin 300192, China
| | - Yingxin Li
- Laser Medicine Laboratory, Institute of Biomedical Engineering, Chinese Academy of Medical Sciences and Peking Union Medical College, Tianjin 300192, China
| | - Chuji Wang
- Laser Medicine Laboratory, Institute of Biomedical Engineering, Chinese Academy of Medical Sciences and Peking Union Medical College, Tianjin 300192, China
| |
Collapse
|
4
|
|
5
|
|
6
|
Su MN, Lin JJM. Note: a transient absorption spectrometer using an ultra bright laser-driven light source. THE REVIEW OF SCIENTIFIC INSTRUMENTS 2013; 84:086106. [PMID: 24007126 DOI: 10.1063/1.4818977] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/02/2023]
Abstract
An apparatus to measure transient absorption spectra for short-lived species in the gas phase was built. This was achieved by coupling a laser-driven plasma light source to a time-gated intensified-CCD spectrometer. Although the laser-driven light source features high brightness, ultra broad bandwidth and long lifetime, we found it possesses a plasma oscillation at a frequency of ~200 kHz with a peak-to-peak amplitude of ~7%. This oscillation caused significant variation of the baseline of the transient absorption spectra even after averaging. To reduce this problem, we synchronized the detector gate time with the phase of the plasma oscillation. This arrangement results in much greater stability of the spectral baseline. We have tested the performance of the whole system with the time-resolved absorption spectra of excited NO3 radicals produced by pulsed laser photolysis of N2O5.
Collapse
Affiliation(s)
- Man-Nung Su
- Institute of Atomic and Molecular Sciences, Academia Sinica, Taipei 10617, Taiwan
| | | |
Collapse
|
7
|
Kiwanuka SS, Laurila TK, Frank JH, Esposito A, Blomberg von der Geest K, Pancheri L, Stoppa D, Kaminski CF. Development of Broadband Cavity Ring-Down Spectroscopy for Biomedical Diagnostics of Liquid Analytes. Anal Chem 2012; 84:5489-93. [DOI: 10.1021/ac301108q] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- S.-S. Kiwanuka
- Department
of Chemical Engineering
and Biotechnology, University of Cambridge, Pembroke Street, Cambridge CB2 3RA, U.K
| | - T. K. Laurila
- Department
of Chemical Engineering
and Biotechnology, University of Cambridge, Pembroke Street, Cambridge CB2 3RA, U.K
- Metrology Research Institute, Aalto University, Espoo, Finland
- Centre for Metrology and Accreditation (MIKES), Espoo, Finland
| | - J. H. Frank
- Combustion Research Facility, Sandia National Laboratories, Livermore California
94551, United States
| | - A. Esposito
- Medical
Research Council Cancer
Cell Unit, Hutchison/MRC Research Centre, Cambridge, U.K
| | | | - L. Pancheri
- Fondazione Bruno Kessler (FBK), Trento, Italy
| | - D. Stoppa
- Fondazione Bruno Kessler (FBK), Trento, Italy
| | - C. F. Kaminski
- Department
of Chemical Engineering
and Biotechnology, University of Cambridge, Pembroke Street, Cambridge CB2 3RA, U.K
- SAOT School of Advanced Optical
Technologies, Max Planck Institute for the Science of Light, University of Erlangen-Nuremberg, Guenther-Scharowsky-Strasse
1, D-91058 Erlangen, Germany
| |
Collapse
|
8
|
|
9
|
PCF-based cavity enhanced spectroscopic sensors for simultaneous multicomponent trace gas analysis. SENSORS 2011; 11:1620-40. [PMID: 22319372 PMCID: PMC3274003 DOI: 10.3390/s110201620] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 10/20/2010] [Revised: 11/16/2010] [Accepted: 01/04/2011] [Indexed: 12/04/2022]
Abstract
A multiwavelength, multicomponent CRDS gas sensor operating on the basis of a compact photonic crystal fibre supercontinuum light source has been constructed. It features a simple design encompassing one radiation source, one cavity and one detection unit (a spectrograph with a fitted ICCD camera) that are common for all wavelengths. Multicomponent detection capability of the device is demonstrated by simultaneous measurements of the absorption spectra of molecular oxygen (spin-forbidden b-X branch) and water vapor (polyads 4v, 4v + δ) in ambient atmospheric air. Issues related to multimodal cavity excitation, as well as to obtaining the best signal-to-noise ratio are discussed together with methods for their practical resolution based on operating the cavity in a “quasi continuum” mode and setting long camera gate widths, respectively. A comprehensive review of multiwavelength CRDS techniques is also given.
Collapse
|
10
|
Fiddler MN, Begashaw I, Mickens MA, Collingwood MS, Assefa Z, Bililign S. Laser spectroscopy for atmospheric and environmental sensing. SENSORS 2009; 9:10447-512. [PMID: 22303184 PMCID: PMC3267232 DOI: 10.3390/s91210447] [Citation(s) in RCA: 80] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 11/18/2009] [Accepted: 12/02/2009] [Indexed: 12/12/2022]
Abstract
Lasers and laser spectroscopic techniques have been extensively used in several applications since their advent, and the subject has been reviewed extensively in the last several decades. This review is focused on three areas of laser spectroscopic applications in atmospheric and environmental sensing; namely laser-induced fluorescence (LIF), cavity ring-down spectroscopy (CRDS), and photoluminescence (PL) techniques used in the detection of solids, liquids, aerosols, trace gases, and volatile organic compounds (VOCs).
Collapse
Affiliation(s)
- Marc N. Fiddler
- NOAA-ISET Center, North Carolina A&T State University, 1601 E Market Street Greensboro, NC 27411, USA; E-Mail:
| | - Israel Begashaw
- Department of Physics, North Carolina A&T State University, Greensboro, 1601 E Market Street, Marteena Hall, Greensboro, NC 27411, USA; E-Mail:
| | - Matthew A. Mickens
- Department of Chemistry, North Carolina A&T State University, 1601 E Market Street, New Science Building, Greensboro, NC 27411, USA; E-Mail:
- Energy & Environmental Systems Program, North Carolina A&T State University, 1601 E Market Street, Greensboro, NC 27411, USA; E-Mail:
| | - Michael S. Collingwood
- Energy & Environmental Systems Program, North Carolina A&T State University, 1601 E Market Street, Greensboro, NC 27411, USA; E-Mail:
| | - Zerihun Assefa
- NOAA-ISET Center, North Carolina A&T State University, 1601 E Market Street Greensboro, NC 27411, USA; E-Mail:
- Department of Chemistry, North Carolina A&T State University, 1601 E Market Street, New Science Building, Greensboro, NC 27411, USA; E-Mail:
- Authors to whom correspondence should be addressed; E-Mails: (Z.A.); (S.B.); Tel.: +1-336-285-2328/2255; Fax: +1-336-256-2542/ 334-7124
| | - Solomon Bililign
- NOAA-ISET Center, North Carolina A&T State University, 1601 E Market Street Greensboro, NC 27411, USA; E-Mail:
- Department of Physics, North Carolina A&T State University, Greensboro, 1601 E Market Street, Marteena Hall, Greensboro, NC 27411, USA; E-Mail:
- Authors to whom correspondence should be addressed; E-Mails: (Z.A.); (S.B.); Tel.: +1-336-285-2328/2255; Fax: +1-336-256-2542/ 334-7124
| |
Collapse
|
11
|
Wang C, Sahay P. Breath analysis using laser spectroscopic techniques: breath biomarkers, spectral fingerprints, and detection limits. SENSORS (BASEL, SWITZERLAND) 2009; 9:8230-62. [PMID: 22408503 PMCID: PMC3292105 DOI: 10.3390/s91008230] [Citation(s) in RCA: 201] [Impact Index Per Article: 13.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 09/01/2009] [Revised: 10/09/2009] [Accepted: 10/10/2009] [Indexed: 12/27/2022]
Abstract
Breath analysis, a promising new field of medicine and medical instrumentation, potentially offers noninvasive, real-time, and point-of-care (POC) disease diagnostics and metabolic status monitoring. Numerous breath biomarkers have been detected and quantified so far by using the GC-MS technique. Recent advances in laser spectroscopic techniques and laser sources have driven breath analysis to new heights, moving from laboratory research to commercial reality. Laser spectroscopic detection techniques not only have high-sensitivity and high-selectivity, as equivalently offered by the MS-based techniques, but also have the advantageous features of near real-time response, low instrument costs, and POC function. Of the approximately 35 established breath biomarkers, such as acetone, ammonia, carbon dioxide, ethane, methane, and nitric oxide, 14 species in exhaled human breath have been analyzed by high-sensitivity laser spectroscopic techniques, namely, tunable diode laser absorption spectroscopy (TDLAS), cavity ringdown spectroscopy (CRDS), integrated cavity output spectroscopy (ICOS), cavity enhanced absorption spectroscopy (CEAS), cavity leak-out spectroscopy (CALOS), photoacoustic spectroscopy (PAS), quartz-enhanced photoacoustic spectroscopy (QEPAS), and optical frequency comb cavity-enhanced absorption spectroscopy (OFC-CEAS). Spectral fingerprints of the measured biomarkers span from the UV to the mid-IR spectral regions and the detection limits achieved by the laser techniques range from parts per million to parts per billion levels. Sensors using the laser spectroscopic techniques for a few breath biomarkers, e.g., carbon dioxide, nitric oxide, etc. are commercially available. This review presents an update on the latest developments in laser-based breath analysis.
Collapse
Affiliation(s)
- Chuji Wang
- Department of Physics and Astronomy and The Institute for Clean Energy Technology, Mississippi State University, Starkville, MS 39759, USA
| | - Peeyush Sahay
- Department of Physics and Astronomy and The Institute for Clean Energy Technology, Mississippi State University, Starkville, MS 39759, USA
| |
Collapse
|
12
|
Orphal J, Ruth AA. High-resolution Fourier-transform cavity-enhanced absorption spectroscopy in the near-infrared using an incoherent broad-band light source. OPTICS EXPRESS 2008; 16:19232-19243. [PMID: 19582015 DOI: 10.1364/oe.16.019232] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/28/2023]
Abstract
An incoherent broad-band cavity-enhanced absorption (IBB-CEA) set-up was used in combination with a Fourier-transform (FT) spectrometer in order to explore the potential of this technique for high-resolution molecular spectroscopy in the near-infrared region. Absorption spectra of overtone bands of CO2, OCS, and HD18O were measured between 5800 and 7000 cm(-1) using a small sampling volume (1100 cm3, based on a 90 cm cavity length). The quality of the spectra in this study is comparable to that obtained with Fourier transform spectrometers employing standard multi-pass reflection cells, which require substantially larger sampling volumes. High-resolution methods such as FT-IBB-CEAS also provide an elegant way to determine effective mirror reflectivities (R(eff), i.e. a measure of the inherent overall cavity loss) by using a calibration gas with well-known line strengths. For narrow absorption features and non-congested spectra this approach does not even require a zero-absorption measurement with the empty cavity. Absolute cross-sections or line strengths of a target species can also be determined in one single measurement, if gas mixtures with known partial pressures are used. This feature of FT-IBB-CEAS reduces systematic errors significantly; it is illustrated based on CO2 as calibration gas.
Collapse
Affiliation(s)
- Johannes Orphal
- Laboratoire Interuniversitaire des Systèmes Atmosphériques (LISA), Université de Paris-Est, CNRS UMR 7583, Créteil, France
| | | |
Collapse
|
13
|
Langridge JM, Laurila T, Watt RS, Jones RL, Kaminski CF, Hult J. Cavity enhanced absorption spectroscopy of multiple trace gas species using a supercontinuum radiation source. OPTICS EXPRESS 2008; 16:10178-10188. [PMID: 18607425 DOI: 10.1364/oe.16.010178] [Citation(s) in RCA: 28] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/26/2023]
Abstract
Supercontinuum radiation sources are attractive for spectroscopic applications owing to their broad wavelength coverage, which enables spectral signatures of multiple species to be detected simultaneously. Here we report the first use of a supercontinuum radiation source for broadband trace gas detection using a cavity enhanced absorption technique. Spectra were recorded at bandwidths of up to 100 nm, encompassing multiple absorption bands of H(2)O, O(2) and O(2)-O(2). The same instrument was also used to make quantitative measurements of NO(2) and NO(3). For NO(3) a detection limit of 3 parts-per-trillion in 2 s was achieved, which corresponds to an effective 3sigma sensitivity of 2.4 x 10(-9) cm(-1)Hz(-1/2). Our results demonstrate that a conceptually simple and robust instrument is capable of highly sensitive broadband absorption measurements.
Collapse
Affiliation(s)
- J M Langridge
- Department of Chemistry, University of Cambridge, Lensfield Road,Cambridge CB2 1EW, UK
| | | | | | | | | | | |
Collapse
|
14
|
Nikolaev IV, Ochkin VN, Spiridonov MV, Tskhai SN. Diode ring-down spectroscopy without intensity modulation in an off-axis multipass cavity. SPECTROCHIMICA ACTA. PART A, MOLECULAR AND BIOMOLECULAR SPECTROSCOPY 2007; 66:832-5. [PMID: 17267275 DOI: 10.1016/j.saa.2006.11.008] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/27/2006] [Revised: 11/13/2006] [Accepted: 11/13/2006] [Indexed: 05/13/2023]
Abstract
Cavity ring-down spectroscopy with an off-axis multipass cell and space separated detectors is proposed to record absorption spectra without modulation of the diode laser intensity. The spectral resolution is approximately 0.0003 cm-1. The whole spectrum is obtained for one continuous tuning of the laser frequency for approximately 20 ms. When comparing this method to conventional CRDS the required rise time is 1000 times slower. The recording of the whole spectrum for one measurement gives additional possibilities of signal extraction at relatively high noise. The technique is applied to absorption measurement of NO2 in atmosphere.
Collapse
Affiliation(s)
- I V Nikolaev
- P.N. Lebedev Physical Institute, Russian Academy of Sciences, Leninsky Prospect, 53, 119991 Moscow, Russia
| | | | | | | |
Collapse
|
15
|
Thorpe MJ, Moll KD, Jones RJ, Safdi B, Ye J. Broadband cavity ringdown spectroscopy for sensitive and rapid molecular detection. Science 2006; 311:1595-9. [PMID: 16543457 DOI: 10.1126/science.1123921] [Citation(s) in RCA: 382] [Impact Index Per Article: 21.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/02/2022]
Abstract
We demonstrate highly efficient cavity ringdown spectroscopy in which a broad-bandwidth optical frequency comb is coherently coupled to a high-finesse optical cavity that acts as the sample chamber. 125,000 optical comb components, each coupled into a specific longitudinal cavity mode, undergo ringdown decays when the cavity input is shut off. Sensitive intracavity absorption information is simultaneously available across 100 nanometers in the visible and near-infrared spectral regions. Real-time, quantitative measurements were made of the trace presence, the transition strengths and linewidths, and the population redistributions due to collisions and the temperature changes for molecules such as C2H2, O2, H2O, and NH3.
Collapse
Affiliation(s)
- Michael J Thorpe
- JILA, National Institute of Standards and Technology (NIST) and University of Colorado, and Department of Physics, University of Colorado, Boulder, CO 80309-0440, USA
| | | | | | | | | |
Collapse
|
16
|
Dupré P, Gherman T, Zobov NF, Tolchenov RN, Tennyson J. Continuous-wave cavity ringdown spectroscopy of the 8ν polyad of water in the 25195−25340cm−1 range. J Chem Phys 2005; 123:154307. [PMID: 16252948 DOI: 10.1063/1.2055247] [Citation(s) in RCA: 27] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Abstract
State-of-the-art experiments and calculations are used to record and assign the data obtained in the weakly absorbing blue energy region of the H2O spectrum. Continuous-wave cavity ringdown absorption spectroscopy with Doppler resolution is used to probe the range from 25,195 to 25,470 cm(-1) with an absorption sensitivity of approximately 1 parts per 10(9) (ppb)/cm. 62 lines of the polyad nu(OH)=8 are reported, of which 43 are assigned using variational nuclear calculations. The study includes absorption line intensities (in the range of 10(-28)-10(-26) cmmolecule) for all lines and self-broadening pressure coefficient for a few lines. The newly obtained energy levels are also reported.
Collapse
Affiliation(s)
- Patrick Dupré
- Laboratoire de Spectrométrie Physique [associated with Centre National de la Recherche Scientifique (CNRS) Unite Mixte de Recherche (UMR) C5588], Université Joseph Fourier de Grenoble, Saint-Martin d'Hères Cedex, France.
| | | | | | | | | |
Collapse
|
17
|
|
18
|
Ball SM, Langridge JM, Jones RL. Broadband cavity enhanced absorption spectroscopy using light emitting diodes. Chem Phys Lett 2004. [DOI: 10.1016/j.cplett.2004.08.144] [Citation(s) in RCA: 120] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
|
19
|
Biennier L, Salama F, Gupta M, O'Keefe A. Multiplex integrated cavity output spectroscopy of cold PAH cations. Chem Phys Lett 2004. [DOI: 10.1016/j.cplett.2004.02.025] [Citation(s) in RCA: 50] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
|
20
|
Gherman T, Kassi S, Campargue A, Romanini D. Overtone spectroscopy in the blue region by cavity-enhanced absorption spectroscopy with a mode-locked femtosecond laser: application to acetylene. Chem Phys Lett 2004. [DOI: 10.1016/j.cplett.2003.10.148] [Citation(s) in RCA: 27] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
|
21
|
Fiedler SE, Hoheisel G, Ruth AA, Hese A. Incoherent broad-band cavity-enhanced absorption spectroscopy of azulene in a supersonic jet. Chem Phys Lett 2003. [DOI: 10.1016/j.cplett.2003.10.075] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
|
22
|
Affiliation(s)
- Stephen M Ball
- University Chemical Laboratory, Cambridge University, Lensfield Road, Cambridge CB2 1EW, United Kingdom
| | | |
Collapse
|
23
|
Brown SS. Absorption Spectroscopy in High-Finesse Cavities for Atmospheric Studies. Chem Rev 2003; 103:5219-38. [PMID: 14664649 DOI: 10.1021/cr020645c] [Citation(s) in RCA: 183] [Impact Index Per Article: 8.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Steven S Brown
- NOAA Aeronomy Lab, R/AL2, 325 Broadway, Boulder, CO 80305, USA
| |
Collapse
|