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Álvarez C, Tejeda G, Fernández JM. Laboratory study of rotationally inelastic collisions of CO2 at low temperatures. J Chem Phys 2024; 160:164307. [PMID: 38651808 DOI: 10.1063/5.0202588] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/05/2024] [Accepted: 03/21/2024] [Indexed: 04/25/2024] Open
Abstract
The rotational relaxation of CO2 by inelastic collisions has been studied in three supersonic jets. The jets were probed by means of Raman spectroscopy with high spectral and spatial resolutions, measuring the rotational populations and the total number density. The time evolution of the rotational populations was analyzed by means of a kinetic master equation, with the help of the energy-corrected sudden power law to relate the numerous state-to-state rate (STS rates) coefficients. In the thermal range investigated, 60-260 K, the STS rates decrease with increasing temperature and with increasing change in the rotational quantum number. Other quantities of interest for fluid dynamics, such as the rotational collision number, the relaxation cross section, and the bulk viscosity, have been derived from the STS rates.
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Affiliation(s)
- C Álvarez
- Laboratory of Molecular Fluid Dynamics, Instituto de Estructura de la Materia IEM-CSIC, C/Serrano 121, 28006 Madrid, Spain
| | - G Tejeda
- Laboratory of Molecular Fluid Dynamics, Instituto de Estructura de la Materia IEM-CSIC, C/Serrano 121, 28006 Madrid, Spain
| | - J M Fernández
- Laboratory of Molecular Fluid Dynamics, Instituto de Estructura de la Materia IEM-CSIC, C/Serrano 121, 28006 Madrid, Spain
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2
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Retter JE, Koll M, Richardson D, Kearney SP. Time-Domain Self-Broadened and Air-Broadened Nitrogen S-Branch Raman Linewidths at 80-200 K Recorded in an Underexpanded Jet. J Chem Phys 2022; 156:194201. [DOI: 10.1063/5.0090613] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Abstract
We report pure-rotational N2-N2, N2-air, and O2-air S-branch linewidths for temperatures of 80-200 K by measuring the time-dependent decay of rotational Raman coherences in an isentropic free-jet expansion from a sonic nozzle. We recorded pure-rotational hybrid femtosecond/picosecond coherent anti-Stokes Raman scattering (fs/ps CARS) spectra along the axial centerline of the underexpanded jet, within the barrel shock region upstream of the Mach disk. Dephasing of the pure-rotational Raman coherence was monitored using probe-time-delay scans at different axial positions in the jet, corresponding to varying local temperatures and pressures. The local temperature was obtained by fitting CARS spectra acquired at zero probe time delay, where the impact of collisions was minimal. The measured decay of each available Raman transition was fit to a dephasing constant and corrected for the local pressure, which was obtained from the CARS-measured static temperature and thermodynamic relationships for isentropic expansion from the known stagnation state. Nitrogen self-broadened transitions decayed more rapidly than those broadened in air for all temperatures, corresponding to higher Raman linewidths. In general, the measured S-branch linewidths deviated significantly in absolute and relative magnitudes from those predicted by extrapolating the modified exponential gap (MEG) model to low temperatures. The temperature dependence of the Raman linewidth for each measured rotational state of nitrogen ( J {less than or equal to} 10) and oxygen ( N {less than or equal to} 11) was fit to a temperature-dependent power-law over the measurable temperature domain (80-200 K) and extrapolated to both higher rotational states and to room temperature.
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Affiliation(s)
- Jonathan E Retter
- National Institute of Aerospace, United States of America
- Sandia National Laboratories
| | - Matthew Koll
- Aerospace Engineering, University of Illinois at Urbana-Champaign, United States of America
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3
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Wernet MP, Georgiadis NJ, Locke RJ. Raman temperature and density measurements in supersonic jets. EXPERIMENTS IN FLUIDS 2021; 62:61. [PMID: 33814684 PMCID: PMC7936943 DOI: 10.1007/s00348-021-03162-2] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 10/01/2020] [Revised: 01/31/2021] [Accepted: 02/04/2021] [Indexed: 06/12/2023]
Abstract
Prediction of flow-field properties in supersonic jets using computational fluid dynamics (CFD) code predictions has become routine; however, obtaining accurate solutions becomes more challenging when there is a significant temperature difference between the jet core and the ambient air and/or compressibility effects are significant. Benchmark sets of flow field property data are required in order to assess current CFD capabilities and develop better modeling approaches for these turbulent flow fields where accurate calculation of temperatures and turbulent heat flux is important. Particle Image Velocimetry, spontaneous rotational Raman scattering spectroscopy, and Background-Oriented Schlieren (BOS) have been previously used to acquire measurements of the mean and root-mean-square (rms) velocities, the mean and rms gas temperatures, and density gradients in subsonic jet flows and film cooling flows. In this work, the ability to measure density is added to the list of measurands available using the acquired Raman spectra. The suite of measurement techniques are now applied to supersonic jet flows. The computation of the local gas pressure in the potential core of an over-expanded jet is demonstrated using the Raman measured gas temperature and density. Additionally, a unique density feature in temperature matched, perfectly expanded jet flow shear layers identified using BOS was verified using the Raman measurement technique. These non-intrusive flow measurements are compared against RANS predictions of the supersonic jet flow properties as a means of assessing their prediction accuracy.
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Pathak S, Obaid R, Bhattacharyya S, Bürger J, Li X, Tross J, Severt T, Davis B, Bilodeau RC, Trallero-Herrero CA, Rudenko A, Berrah N, Rolles D. Differentiating and Quantifying Gas-Phase Conformational Isomers Using Coulomb Explosion Imaging. J Phys Chem Lett 2020; 11:10205-10211. [PMID: 33206545 DOI: 10.1021/acs.jpclett.0c02959] [Citation(s) in RCA: 9] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/11/2023]
Abstract
Conformational isomerism plays a crucial role in defining the physical and chemical properties and biological activity of molecules ranging from simple organic compounds to complex biopolymers. However, it is often a significant challenge to differentiate and separate these isomers experimentally as they can easily interconvert due to their low rotational energy barrier. Here, we use the momentum correlation of fragment ions produced after inner-shell photoionization to distinguish conformational isomers of 1,2-dibromoethane (C2H4Br2). We demonstrate that the three-body breakup channel, C2H4+ + Br+ + Br+, contains signatures of both sequential and concerted breakup, which are decoupled to distinguish the geometries of two conformational isomers and to quantify their relative abundance. The sensitivity of our method to quantify these yields is established by measuring the relative abundance change with sample temperature, which agrees well with calculations. Our study paves the way for using Coulomb explosion imaging to track subtle molecular structural changes.
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Affiliation(s)
- Shashank Pathak
- J.R. Macdonald Laboratory, Department of Physics, Kansas State University, Manhattan, Kansas 66506, United States
| | - Razib Obaid
- Department of Physics, University of Connecticut, Storrs, Connecticut 06269, United States
| | - Surjendu Bhattacharyya
- J.R. Macdonald Laboratory, Department of Physics, Kansas State University, Manhattan, Kansas 66506, United States
| | - Johannes Bürger
- Department of Physics, Ludwig Maximilian University of Munich, Munich 80539, Germany
| | - Xiang Li
- J.R. Macdonald Laboratory, Department of Physics, Kansas State University, Manhattan, Kansas 66506, United States
| | - Jan Tross
- J.R. Macdonald Laboratory, Department of Physics, Kansas State University, Manhattan, Kansas 66506, United States
| | - Travis Severt
- J.R. Macdonald Laboratory, Department of Physics, Kansas State University, Manhattan, Kansas 66506, United States
| | - Brandin Davis
- Department of Physics, University of Connecticut, Storrs, Connecticut 06269, United States
| | - René C Bilodeau
- Department of Physics, University of Connecticut, Storrs, Connecticut 06269, United States
- Advanced Light Source, Lawrence Berkeley National Laboratory, Berkeley, California 94720, United States
| | | | - Artem Rudenko
- J.R. Macdonald Laboratory, Department of Physics, Kansas State University, Manhattan, Kansas 66506, United States
| | - Nora Berrah
- Department of Physics, University of Connecticut, Storrs, Connecticut 06269, United States
| | - Daniel Rolles
- J.R. Macdonald Laboratory, Department of Physics, Kansas State University, Manhattan, Kansas 66506, United States
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5
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Wu C, Wu C, Fan Y, Xie X, Wang P, Deng Y, Liu Y, Gong Q. Three-body fragmentation of CO2 driven by intense laser pulses. J Chem Phys 2015; 142:124303. [DOI: 10.1063/1.4916045] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Affiliation(s)
- Chengyin Wu
- State Key Laboratory for Mesoscopic Physics, Department of Physics, Peking University, Beijing 100871, People’s Republic of China
- Collaborative Innovation Center of Quantum Matter, Beijing 100871, People’s Republic of China
| | - Cong Wu
- State Key Laboratory for Mesoscopic Physics, Department of Physics, Peking University, Beijing 100871, People’s Republic of China
| | - Yameng Fan
- State Key Laboratory for Mesoscopic Physics, Department of Physics, Peking University, Beijing 100871, People’s Republic of China
| | - Xiguo Xie
- State Key Laboratory for Mesoscopic Physics, Department of Physics, Peking University, Beijing 100871, People’s Republic of China
| | - Peng Wang
- State Key Laboratory for Mesoscopic Physics, Department of Physics, Peking University, Beijing 100871, People’s Republic of China
| | - Yongkai Deng
- State Key Laboratory for Mesoscopic Physics, Department of Physics, Peking University, Beijing 100871, People’s Republic of China
| | - Yunquan Liu
- State Key Laboratory for Mesoscopic Physics, Department of Physics, Peking University, Beijing 100871, People’s Republic of China
- Collaborative Innovation Center of Quantum Matter, Beijing 100871, People’s Republic of China
| | - Qihuang Gong
- State Key Laboratory for Mesoscopic Physics, Department of Physics, Peking University, Beijing 100871, People’s Republic of China
- Collaborative Innovation Center of Quantum Matter, Beijing 100871, People’s Republic of China
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6
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Li Z, Borner A, Levin DA. Multi-scale study of condensation in water jets using ellipsoidal-statistical Bhatnagar-Gross-Krook and molecular dynamics modeling. J Chem Phys 2014; 140:224501. [PMID: 24929401 DOI: 10.1063/1.4879797] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Abstract
Homogeneous water condensation and ice formation in supersonic expansions to vacuum for stagnation pressures from 12 to 1000 mbar are studied using the particle-based Ellipsoidal-Statistical Bhatnagar-Gross-Krook (ES-BGK) method. We find that when condensation starts to occur, at a stagnation pressure of 96 mbar, the increase in the degree of condensation causes an increase in the rotational temperature due to the latent heat of vaporization. The simulated rotational temperature profiles along the plume expansion agree well with measurements confirming the kinetic homogeneous condensation models and the method of simulation. Comparisons of the simulated gas and cluster number densities, cluster size for different stagnation pressures along the plume centerline were made and it is found that the cluster size increase linearly with respect to stagnation pressure, consistent with classical nucleation theory. The sensitivity of our results to cluster nucleation model and latent heat values based on bulk water, specific cluster size, or bulk ice are examined. In particular, the ES-BGK simulations are found to be too coarse-grained to provide information on the phase or structure of the clusters formed. For this reason, molecular dynamics simulations of water condensation in a one-dimensional free expansion to simulate the conditions in the core of a plume are performed. We find that the internal structure of the clusters formed depends on the stagnation temperature. A larger cluster of average size 21 was tracked down the expansion, and a calculation of its average internal temperature as well as a comparison of its radial distribution functions (RDFs) with values measured for solid amorphous ice clusters lead us to conclude that this cluster is in a solid-like rather than liquid form. In another molecular-dynamics simulation at a much lower stagnation temperature, a larger cluster of size 324 and internal temperature 200 K was extracted from an expansion plume and equilibrated to determine its RDF and self-diffusion coefficient. The value of the latter shows that this cluster is formed in a supercooled liquid state rather than in an amorphous solid state.
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Affiliation(s)
- Zheng Li
- Department of Aerospace Engineering, The Pennsylvania State University, University Park, Pennsylvania 16802, USA
| | - Arnaud Borner
- Department of Aerospace Engineering, The Pennsylvania State University, University Park, Pennsylvania 16802, USA
| | - Deborah A Levin
- Department of Aerospace Engineering, The Pennsylvania State University, University Park, Pennsylvania 16802, USA
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7
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Kumar R, Li Z, van Duin A, Levin D. Molecular dynamics studies to understand the mechanism of heat accommodation in homogeneous condensing flow of carbon dioxide. J Chem Phys 2011; 135:064503. [PMID: 21842939 DOI: 10.1063/1.3624335] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/19/2022] Open
Abstract
Using molecular dynamics (MD), we have studied the mechanism of heat accommodation between carbon dioxide clusters and monomers for temperatures and cluster size conditions that exist in homogeneous condensing supersonic expansion plumes. The work was motivated by our meso-scale direct simulation Monte Carlo and Bhatnagar-Gross-Krook based condensation simulations where we found that the heat accommodation model plays a key role in the near-field of the nozzle expansion particularly as the degree of condensation increases [R. Kumar, Z. Li, and D. Levin, Phys. Fluids 23, 052001 (2011)]. The heat released by nucleation and condensation and the heat removed by cluster evaporation can be transferred or removed from either the kinetic or translational modes of the carbon dioxide monomers. The molecular dynamics results show that the time required for gas-cluster interactions to establish an equilibrium from an initial state of non-equilibrium is less than the time step used in meso-scale analyses [R. Kumar, Z. Li, and D. Levin, Phys. Fluids 23, 052001 (2011)]. Therefore, the good agreement obtained between the measured cluster and gas number density and gas temperature profiles with the meso-scale modeling using the second energy exchange mechanism is not fortuitous but is physically based. Our MD simulations also showed that a dynamic equilibrium is established by the gas-cluster interactions in which condensation and evaporation processes take place constantly to and from a cluster.
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Affiliation(s)
- Rakesh Kumar
- The Pennsylvania State University, University Park, Pennsylvania 16802, USA.
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8
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Pérez-Ríos J, Tejeda G, Fernández JM, Hernández MI, Montero S. Inelastic collisions in molecular oxygen at low temperature (4 ⩽T⩽ 34 K). Close-coupling calculations versus experiment. J Chem Phys 2011; 134:174307. [DOI: 10.1063/1.3585978] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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9
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Hesse S, Wassermann TN, Suhm MA. Brightening and Locking a Weak and Floppy N−H Chromophore: The Case of Pyrrolidine. J Phys Chem A 2010; 114:10492-9. [DOI: 10.1021/jp105517b] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Susanne Hesse
- Institut für Physikalische Chemie, Universität Göttingen, Tammannstrasse 6, 37077 Göttingen, Germany
| | - Tobias N. Wassermann
- Institut für Physikalische Chemie, Universität Göttingen, Tammannstrasse 6, 37077 Göttingen, Germany
| | - Martin A. Suhm
- Institut für Physikalische Chemie, Universität Göttingen, Tammannstrasse 6, 37077 Göttingen, Germany
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10
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Wassermann TN, Suhm MA. Ethanol Monomers and Dimers Revisited: A Raman Study of Conformational Preferences and Argon Nanocoating Effects. J Phys Chem A 2010; 114:8223-33. [DOI: 10.1021/jp104861q] [Citation(s) in RCA: 49] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Tobias N. Wassermann
- Institut für Physikalische Chemie, Universität Göttingen, Tammannstrasse 6, 37077 Göttingen, Germany
| | - Martin A. Suhm
- Institut für Physikalische Chemie, Universität Göttingen, Tammannstrasse 6, 37077 Göttingen, Germany
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11
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Balabin RM. The identification of the two missing conformers of gas-phase alanine: a jet-cooled Raman spectroscopy study. Phys Chem Chem Phys 2010; 12:5980-2. [PMID: 20383408 DOI: 10.1039/b924029b] [Citation(s) in RCA: 47] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/08/2023]
Abstract
The jet-cooled spontaneous Raman spectrum of an amino acid-alanine (Ala, 2-aminopropanoic acid; H(2)NCH(CH(3))COOH)-is reported. The low-frequency vibrational spectrum (below 500 cm(-1)) was recorded and assigned using quantum chemical data: ab initio (MP2) and DFT (BLYP, B3LYP, and PBE0). Band polarization measurements were used to confirm the vibrational assignments. The acquired medium resolution spectra (HWHM of approximately 4 cm(-1)) allow the different alanine conformations to be distinguished. Four alanine conformers were observed and identified: two previously reported by microwave spectroscopy studies and two that were previously unreported. A set of reasons for why these conformers eluded previous studies are discussed. Selective collisional relaxation processes in the jet (associated with low interconversion barriers between different alanine conformations) that depopulate the high-energy conformers were experimentally demonstrated.
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Affiliation(s)
- Roman M Balabin
- Department of Chemistry and Applied Biosciences, ETH Zurich, 8093 Zurich, Switzerland.
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12
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Dauster I, Rice CA, Zielke P, Suhm MA. N–H⋯π interactions in pyrroles: systematic trends from the vibrational spectroscopy of clusters. Phys Chem Chem Phys 2008; 10:2827-35. [PMID: 18465000 DOI: 10.1039/b717823a] [Citation(s) in RCA: 65] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Affiliation(s)
- Ingo Dauster
- Institut für Physikalische Chemie, Universität Göttingen, Göttingen, Germany
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13
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Nedić M, Wassermann TN, Xue Z, Zielke P, Suhm MA. Raman spectroscopic evidence for the most stable water/ethanol dimer and for the negative mixing energy in cold water/ethanol trimers. Phys Chem Chem Phys 2008; 10:5953-6. [DOI: 10.1039/b811154e] [Citation(s) in RCA: 35] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/27/2022]
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14
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Fonfría JP, Ramos A, Thibault F, Tejeda G, Fernández JM, Montero S. Inelastic collisions in molecular nitrogen at low temperature (2⩽T⩽50K). J Chem Phys 2007; 127:134305. [DOI: 10.1063/1.2784255] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/22/2023] Open
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15
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Scharge T, Cézard C, Zielke P, Schütz A, Emmeluth C, Suhm MA. A peptide co-solvent under scrutiny: self-aggregation of 2,2,2-trifluoroethanol. Phys Chem Chem Phys 2007; 9:4472-90. [PMID: 17690773 DOI: 10.1039/b705498j] [Citation(s) in RCA: 58] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/01/2023]
Abstract
Trifluoroethanol (TFE) and its aggregates are studied via supersonic jet FTIR and Raman spectroscopy as well as by quantum chemistry and simple force field approaches. A multi-slit nozzle is introduced to study collisionally excited clusters. Efforts are made to extract harmonic frequencies from experiment for better comparison to theory. Based on deuteration, the OH stretching anharmonicity changes weakly upon dimerization, but increases for trimers. Among the possible dimer conformations, only an all-gauche, homoconfigurational, compact, OH-F connected structure is observed in an extreme case of chiral discrimination. Quantum tunneling assisted pathways for this surprising helicity synchronization are postulated. The oscillator coupling in hydrogen-bonded trimers is analyzed. Trans conformations of TFE start to become important for trimers and probably persist in the liquid state. Simple force fields can be refined to capture some molecular recognition features of TFE dimer, but their limitations are emphasized.
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Affiliation(s)
- Tina Scharge
- Institut für Physikalische Chemie, Universität Göttingen, Tammannstr. 6, 37077, Göttingen, Germany
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16
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Steinbach C, Fárník M, Ettischer I, Siebers J, Buck U. Isomeric transitions in size-selected methanol hexamers probed by OH-stretch spectroscopy. Phys Chem Chem Phys 2006; 8:2752-8. [PMID: 16763708 DOI: 10.1039/b604715g] [Citation(s) in RCA: 27] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
We have measured the isomeric transition between the energetically lowest lying isomers of S6 and C2-symmetry of (CH3OH)6. The clusters are size-selected by deflection in collisions with He, and the isomers are identified by their infrared spectra of the OH-stretching vibration. The measurements are carried out at three source temperatures 253, 300 and 373 K which correspond to the cluster temperatures 93, 106 and 135 K. The latter ones are estimated by a relaxation model that accounts for the cluster formation and the energy released by the condensation. The transition takes place at a cluster temperature of about 102 K which is in agreement with the Molecular Dynamics simulation of such a transition at about 117 K using a realistic model potential.
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Affiliation(s)
- C Steinbach
- Max-Planck-Institut für Dynamik und Selbstorganisation, Bunsenstrasse 10, 37073 Göttingen, Germany
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17
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Amaral GA, Aoiz FJ, Bañares L, Barr J, Herrero VJ, Martínez-Haya B, Menéndez M, Pino GA, Tanarro I, Torres I, Verdasco JE. Low-Temperature Rotational Relaxation of CO in Self-Collisions and in Collisions with Ne and He. J Phys Chem A 2005; 109:9402-13. [PMID: 16866388 DOI: 10.1021/jp051766u] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
The low-temperature rotational relaxation of CO in self-collisions and in collisions with the rare-gas atoms Ne and He has been investigated in supersonic expansions with a combination of resonance-enhanced multiphoton ionization (REMPI) spectroscopy and time-of-flight techniques. For the REMPI detection of CO, a novel 2 + 1' scheme has been employed through the A(1)Pi state of CO. From the measured data, average cross sections for rotational relaxation have been derived as a function of temperature in the range 5-100 K. For CO-Ne and CO-He, the relaxation cross sections grow, respectively, from values of approximately 20 and 7 A(2) at 100 K to values of approximately 65-70 and approximately 20 A(2) in the 5-20 K temperature range. The cross section for the relaxation of CO-CO grows from a value close to 40 A(2) at 100 K to a maximum of 60 A(2) at 20 K and then decreases again to 40 A(2) at 5 K. These results are qualitatively similar to those obtained previously with the same technique for N(2)-N(2), N(2)-Ne, and N(2)-He collisions, although in the low-temperature range (T < 20 K) the CO relaxation cross sections are significantly larger than those for N(2). Some discrepancies have been found between the present relaxation cross sections for CO-CO and CO-He and the values derived from electron-induced fluorescence experiments.
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Affiliation(s)
- G A Amaral
- Departamento de Química Física, Facultad de Química, Universidad Complutense de Madrid, E-28040 Madrid, Spain
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18
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Maté B, Thibault F, Tejeda G, Fernández JM, Montero S. Inelastic collisions in para-H2: translation-rotation state-to-state rate coefficients and cross sections at low temperature and energy. J Chem Phys 2005; 122:064313. [PMID: 15740378 DOI: 10.1063/1.1850464] [Citation(s) in RCA: 40] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/12/2023] Open
Abstract
We report an experimental determination of the k(00-->02) rate coefficient for inelastic H(2):H(2) collisions in the temperature range from 2 to 110 K based on Raman spectroscopy data in supersonic expansions of para-H(2). For this purpose a more accurate method for inverting the master equation of rotational populations is presented. The procedure permits us to reduce the measured k(00-->02) rate coefficient to the corresponding sigma(00-->02) cross section in the range of precollisional energy from 360 to 600 cm(-1). Numerical calculations of sigma(00-->02) carried out in the frame of the coupled channel method are also reported for different intermolecular potentials of H(2). A good agreement is found between the experimental cross section and the numerical one derived from Diep and Johnson's potential [J. Chem. Phys. 112, 4465 (2000)].
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Affiliation(s)
- B Maté
- Instituto de Estructura de la Materia, CSIC Serrano 121, 28006 Madrid, Spain
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19
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Pasteris JD, Wopenka B, Freeman JJ, Brewer PG, White SN, Peltzer ET, Malby GE. Raman spectroscopy in the deep ocean: successes and challenges. APPLIED SPECTROSCOPY 2004; 58:195A-208A. [PMID: 15282037 DOI: 10.1366/0003702041389319] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/24/2023]
Affiliation(s)
- Jill Dill Pasteris
- Department of Earth and Planetary Sciences, Washington University, Campus Box 1169, St. Louis, MO 63132-4899, USA
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20
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Maté B, Thibault F, Ramos A, Tejeda G, Fernández JM, Montero S. Experimental and theoretical determination of rotational-translational state-to-state rate constants for N2:He collisions at low temperature (3 J Chem Phys 2003. [DOI: 10.1063/1.1543945] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/19/2022] Open
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21
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Bonnamy A, Georges R, Benidar A, Boissoles J, Canosa A, Rowe BR. Infrared spectroscopy of (CO2)N nanoparticles (30 J Chem Phys 2003. [DOI: 10.1063/1.1539036] [Citation(s) in RCA: 35] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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22
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Aoiz FJ, Bañares L, Herrero VJ, Martínez-Haya B, Menéndez M, Quintana P, Tanarro I, Verdasco E. Low-Temperature Rotational Relaxation of N2 in Collisions with Ne. J Phys Chem A 2001. [DOI: 10.1021/jp010845c] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/11/2023]
Affiliation(s)
- F. J. Aoiz
- Departamento de Química Física and CAI de espectroscopía, Facultad de Química, Universidad Complutense, E-28040 Madrid, Spain, Instituto de Estructura de la Materia (CSIC), Serrano 123, E-28006 Madrid, Spain, and Departamento de Ciencias Ambientales, Universidad Pablo de Olavide, E-41013 Sevilla, Spain
| | - L. Bañares
- Departamento de Química Física and CAI de espectroscopía, Facultad de Química, Universidad Complutense, E-28040 Madrid, Spain, Instituto de Estructura de la Materia (CSIC), Serrano 123, E-28006 Madrid, Spain, and Departamento de Ciencias Ambientales, Universidad Pablo de Olavide, E-41013 Sevilla, Spain
| | - V. J. Herrero
- Departamento de Química Física and CAI de espectroscopía, Facultad de Química, Universidad Complutense, E-28040 Madrid, Spain, Instituto de Estructura de la Materia (CSIC), Serrano 123, E-28006 Madrid, Spain, and Departamento de Ciencias Ambientales, Universidad Pablo de Olavide, E-41013 Sevilla, Spain
| | - B. Martínez-Haya
- Departamento de Química Física and CAI de espectroscopía, Facultad de Química, Universidad Complutense, E-28040 Madrid, Spain, Instituto de Estructura de la Materia (CSIC), Serrano 123, E-28006 Madrid, Spain, and Departamento de Ciencias Ambientales, Universidad Pablo de Olavide, E-41013 Sevilla, Spain
| | - M. Menéndez
- Departamento de Química Física and CAI de espectroscopía, Facultad de Química, Universidad Complutense, E-28040 Madrid, Spain, Instituto de Estructura de la Materia (CSIC), Serrano 123, E-28006 Madrid, Spain, and Departamento de Ciencias Ambientales, Universidad Pablo de Olavide, E-41013 Sevilla, Spain
| | - P. Quintana
- Departamento de Química Física and CAI de espectroscopía, Facultad de Química, Universidad Complutense, E-28040 Madrid, Spain, Instituto de Estructura de la Materia (CSIC), Serrano 123, E-28006 Madrid, Spain, and Departamento de Ciencias Ambientales, Universidad Pablo de Olavide, E-41013 Sevilla, Spain
| | - I. Tanarro
- Departamento de Química Física and CAI de espectroscopía, Facultad de Química, Universidad Complutense, E-28040 Madrid, Spain, Instituto de Estructura de la Materia (CSIC), Serrano 123, E-28006 Madrid, Spain, and Departamento de Ciencias Ambientales, Universidad Pablo de Olavide, E-41013 Sevilla, Spain
| | - E. Verdasco
- Departamento de Química Física and CAI de espectroscopía, Facultad de Química, Universidad Complutense, E-28040 Madrid, Spain, Instituto de Estructura de la Materia (CSIC), Serrano 123, E-28006 Madrid, Spain, and Departamento de Ciencias Ambientales, Universidad Pablo de Olavide, E-41013 Sevilla, Spain
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Aoiz FJ, Díez-Rojo T, Herrero VJ, Martínez-Haya B, Menéndez M, Quintana P, Ramonat L, Tanarro I, Verdasco E. Low-Temperature Rotational Relaxation of N2 Studied with Resonance-Enhanced Multiphoton Ionization. J Phys Chem A 1999. [DOI: 10.1021/jp983850y] [Citation(s) in RCA: 22] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/16/2022]
Affiliation(s)
- F. J. Aoiz
- Departamento de Química Física, Facultad de Química, Universidad Complutense, E-28040 Madrid, Spain, and Instituto de Estructura de la Materia (CSIC), Serrano 113, E-28006 Madrid, Spain
| | - T. Díez-Rojo
- Departamento de Química Física, Facultad de Química, Universidad Complutense, E-28040 Madrid, Spain, and Instituto de Estructura de la Materia (CSIC), Serrano 113, E-28006 Madrid, Spain
| | - V. J. Herrero
- Departamento de Química Física, Facultad de Química, Universidad Complutense, E-28040 Madrid, Spain, and Instituto de Estructura de la Materia (CSIC), Serrano 113, E-28006 Madrid, Spain
| | - B. Martínez-Haya
- Departamento de Química Física, Facultad de Química, Universidad Complutense, E-28040 Madrid, Spain, and Instituto de Estructura de la Materia (CSIC), Serrano 113, E-28006 Madrid, Spain
| | - M. Menéndez
- Departamento de Química Física, Facultad de Química, Universidad Complutense, E-28040 Madrid, Spain, and Instituto de Estructura de la Materia (CSIC), Serrano 113, E-28006 Madrid, Spain
| | - P. Quintana
- Departamento de Química Física, Facultad de Química, Universidad Complutense, E-28040 Madrid, Spain, and Instituto de Estructura de la Materia (CSIC), Serrano 113, E-28006 Madrid, Spain
| | - L. Ramonat
- Departamento de Química Física, Facultad de Química, Universidad Complutense, E-28040 Madrid, Spain, and Instituto de Estructura de la Materia (CSIC), Serrano 113, E-28006 Madrid, Spain
| | - I. Tanarro
- Departamento de Química Física, Facultad de Química, Universidad Complutense, E-28040 Madrid, Spain, and Instituto de Estructura de la Materia (CSIC), Serrano 113, E-28006 Madrid, Spain
| | - E. Verdasco
- Departamento de Química Física, Facultad de Química, Universidad Complutense, E-28040 Madrid, Spain, and Instituto de Estructura de la Materia (CSIC), Serrano 113, E-28006 Madrid, Spain
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24
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Någård MB, Marković N, Pettersson JBC. Scattering and trapping dynamics of gas-surface interactions: Vibrational excitation of CF3Br on graphite. J Chem Phys 1998. [DOI: 10.1063/1.477690] [Citation(s) in RCA: 17] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/10/2023] Open
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