1
|
Rakovský J, Svoboda V, Horká-Zelenková V, Votava O. Pattern recognition as a new strategy in high-resolution spectroscopy: application to methanol OH-stretch overtones. Phys Chem Chem Phys 2021; 23:20193-20200. [PMID: 34473152 DOI: 10.1039/d1cp02639a] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
We further develop a strategy for a line-by-line assignment of complex high-resolution overtone spectra. A search for specific line patterns in the spectrum allows to identify upper rotational states by extending the concept of ground state combination differences (GSCD). Simultaneous use of all GSCDs relating to a given upper state significantly reduces a probability of incorrect assignments. To test this approach, we have analysed a newly recorded spectrum of methanol in the first OH-stretch overtone region, 2νOH, between 7170 cm-1 and 7220 cm-1 at temperature of 19 K by combining a tunable-laser-diode absorption spectrometer with a slit-jet supersonic expansion. The spectrum consists of 1002 lines at this low temperature reflecting the fact that methanol is an asymmetric rotor with a hindered internal rotation. In total, 295 lines have been reliably assigned, representing 63% of the total intensity. Rotational energies and rotational quantum numbers for 52 upper states have been determined. Many of these states have the same quantum numbers, suggesting couplings to a manifold of 'dark' vibrational states in this overtone region.
Collapse
Affiliation(s)
- Jozef Rakovský
- ASCR, J. Heyrovský Institute of Physical Chemistry, v.v.i., Dolejškova 2155/3, 182 23 Prague 8, Czech Republic.
| | - Vít Svoboda
- ASCR, J. Heyrovský Institute of Physical Chemistry, v.v.i., Dolejškova 2155/3, 182 23 Prague 8, Czech Republic. .,Laboratory of Physical Chemistry, ETH Zürich, Vladimir-Prelog-Weg 2, 8093 Zürich, Switzerland
| | - Veronika Horká-Zelenková
- ASCR, J. Heyrovský Institute of Physical Chemistry, v.v.i., Dolejškova 2155/3, 182 23 Prague 8, Czech Republic. .,ASCR, Institute of Physics, v.v.i., Na Slovance 1999/2, 182 21 Prague 8, Czech Republic
| | - Ondrej Votava
- ASCR, J. Heyrovský Institute of Physical Chemistry, v.v.i., Dolejškova 2155/3, 182 23 Prague 8, Czech Republic.
| |
Collapse
|
2
|
Georges R, Michaut X, Moudens A, Goubet M, Pirali O, Soulard P, Asselin P, Huet T, Roy P, Fournier M, Vigasin A. Nuclear Spin Symmetry Conservation in 1H 216O Investigated by Direct Absorption FTIR Spectroscopy of Water Vapor Cooled Down in Supersonic Expansion. J Phys Chem A 2017; 121:7455-7468. [PMID: 28914060 DOI: 10.1021/acs.jpca.7b06858] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
We report the results of an experimental study related to the relaxation of the nuclear spin isomers of the water molecule in a supersonic expansion. Rovibrational lines of both ortho and para spin isomers were recorded in the spectral range of H2O stretching vibrations at around 3700 cm-1 using FTIR direct absorption. Water vapor seeded in argon, helium, or oxygen or in a mixture of oxygen and argon was expanded into vacuum through a slit nozzle. The water vapor partial pressure in the mixture varied over a wide range from 1.5 to 102.7 hPa, corresponding to a water molar fraction varying between 0.2 and 6.5%. Depending on expansion conditions, the effect of water vapor clustering was clearly seen in some of our measured spectra. The Boltzmann plot of the line intensities allowed the H2O rotational temperatures in the isentropic core and in the lateral shear layer probed zones of the planar expansion to be determined. The study of the OPR, i.e., the ratio of the ortho to para absorption line intensities as a function of Trot, did not reveal any signs of the OPR being relaxed to the sample temperature. In contrast, the OPR was always conserved according to the stagnation reservoir equilibrium temperature. The conservation of the OPR was found irrespective of whether water molecule clustering was pronounced or not. Also, no effect of the paramagnetic oxygen admixture enhancing OPR relaxation was observed.
Collapse
Affiliation(s)
- Robert Georges
- Institut de Physique de Rennes, UMR6251, CNRS-Université de Rennes 1 , Campus de Beaulieu, 35042 Rennes, France
| | - Xavier Michaut
- Laboratoire d'Etudes du Rayonnement et de la Matière en Astrophysique et Atmosphères, Sorbonne Universities, UPMC Univ. Paris 06, Université de Cergy-Pontoise, Observatoire de Paris, PSL Research University, CNRS , F-75252 Paris, France
| | - Audrey Moudens
- Laboratoire d'Etudes du Rayonnement et de la Matière en Astrophysique et Atmosphères, Sorbonne Universities, UPMC Univ. Paris 06, Université de Cergy-Pontoise, Observatoire de Paris, PSL Research University, CNRS , F-75252 Paris, France
| | - Manuel Goubet
- Université Lille, CNRS, UMR8523-PhLAM - Physique des Lasers, Atomes et Molécules , F-59000 Lille, France
| | - Olivier Pirali
- AILES beamline, Synchrotron SOLEIL, L'Orme des Merisiers , Saint Aubin BP 48, F-91192 Gif-sur-Yvette Cedex, France.,Institut des Sciences Moléculaires d'Orsay (ISMO), UMR 8214 CNRS, Univ. Paris-Sud, Université Paris-Saclay , F-91405 Orsay, France
| | - Pascale Soulard
- Sorbonne Universités, UPMC Univ Paris 06, CNRS, UMR 8233, MONARIS , F-75005 Paris, France
| | - Pierre Asselin
- Sorbonne Universités, UPMC Univ Paris 06, CNRS, UMR 8233, MONARIS , F-75005 Paris, France
| | - Thérèse Huet
- Université Lille, CNRS, UMR8523-PhLAM - Physique des Lasers, Atomes et Molécules , F-59000 Lille, France
| | - Pascale Roy
- AILES beamline, Synchrotron SOLEIL, L'Orme des Merisiers , Saint Aubin BP 48, F-91192 Gif-sur-Yvette Cedex, France
| | - Martin Fournier
- Institut de Physique de Rennes, UMR6251, CNRS-Université de Rennes 1 , Campus de Beaulieu, 35042 Rennes, France
| | - Andrey Vigasin
- Obukhov Institute of Atmospheric Physics, Russian Academy of Sciences , 3 Pyzhevsky per, 119017 Moscow, Russia
| |
Collapse
|
3
|
Owens A, Yurchenko SN, Yachmenev A, Tennyson J, Thiel W. A highly accurate ab initio potential energy surface for methane. J Chem Phys 2016; 145:104305. [DOI: 10.1063/1.4962261] [Citation(s) in RCA: 34] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Affiliation(s)
- Alec Owens
- Department of Physics and Astronomy, University College London, Gower Street, WC1E 6BT London, United Kingdom
- Max-Planck-Institut für Kohlenforschung, Kaiser-Wilhelm-Platz 1, 45470 Mülheim an der Ruhr, Germany
| | - Sergei N. Yurchenko
- Department of Physics and Astronomy, University College London, Gower Street, WC1E 6BT London, United Kingdom
| | - Andrey Yachmenev
- Department of Physics and Astronomy, University College London, Gower Street, WC1E 6BT London, United Kingdom
| | - Jonathan Tennyson
- Department of Physics and Astronomy, University College London, Gower Street, WC1E 6BT London, United Kingdom
| | - Walter Thiel
- Max-Planck-Institut für Kohlenforschung, Kaiser-Wilhelm-Platz 1, 45470 Mülheim an der Ruhr, Germany
| |
Collapse
|
4
|
Rey M, Nikitin AV, Campargue A, Kassi S, Mondelain D, Tyuterev VG. Ab initio variational predictions for understanding highly congested spectra: rovibrational assignment of 108 new methane sub-bands in the icosad range (6280–7800 cm−1). Phys Chem Chem Phys 2016; 18:176-89. [DOI: 10.1039/c5cp05265c] [Citation(s) in RCA: 37] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
This work demonstrates for the first time how accurate first principles global calculations allow assigning complicated spectra of a molecule with more than 4 atoms.
Collapse
Affiliation(s)
- Michaël Rey
- Groupe de Spectrométrie Moléculaire et Atmosphérique
- Reims Cedex 2
- France
| | - Andrei V. Nikitin
- Laboratory of Theoretical Spectroscopy
- Institute of Atmospheric Optics
- SB RAS
- 634055 TOMSK
- Russia
| | | | - Samir Kassi
- Univ. Grenoble Alpes
- LIPhy
- F-38000 Grenoble
- France
- CNRS
| | | | | |
Collapse
|
5
|
Svoboda V, Horká-Zelenková V, Rakovský J, Pracna P, Votava O. OH-stretch overtone of methanol: empirical assignment using a two temperature technique in a supersonic jet. Phys Chem Chem Phys 2015; 17:15710-7. [PMID: 26008900 DOI: 10.1039/c5cp00425j] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
This paper describes a novel approach for empirical lower state assignments in complex high resolution ro-vibrational overtone spectra of molecules with low rotational constants and complex intramolecular dynamics. Methanol, CH3OH, was chosen as a representative of such molecules - it is an asymmetric top with two non-hydrogen nuclei and hindered internal rotation leading to dense and disordered rotational structure of vibrational overtone bands. We report the first rotationally resolved methanol spectra of the OH-stretch overtone 2ν1 band using sub-Doppler diode laser spectroscopy in a supersonic jet, and describe how the combination of two temperature analysis (TTA) and analysis by ground state combination differences (GSCDs) is used to reliably identify spectral lines that originate from lowest rotational states. In the first step of the analysis, the TTA was utilized to obtain a set of possible rotational assignments for each spectral line using the line intensity variation between two different temperatures in the supersonic jet (13, and 56 K respectively). Thereafter, the GSCDs were used to confirm specific lower state assignment for those spectral lines that have been identified to have low rotational ground states by the TTA. We show that the TTA pre-selection leads to fast and reliable confirmation by GSCDs and avoids false assignments due to accidental GSCD matches. The procedure yields an important subset of reliably assigned spectral lines in the complex ro-vibrational structure that provides a convenient starting point for subsequent application of traditional spectral analysis techniques.
Collapse
Affiliation(s)
- Vít Svoboda
- J. Heyrovský Institute of Physical Chemistry of the ASCR, v.v.i., Dolejškova 2155/3, 182 23 Prague 8, Czech Republic.
| | | | | | | | | |
Collapse
|
6
|
Ulenikov O, Bekhtereva E, Fomchenko A, Litvinovskaya A, Leroy C, Quack M. On the ‘expanded local mode’ approach applied to the methane molecule: isotopic substitutions CH3D ←CH4 and CHD3 ←CH4. Mol Phys 2014. [DOI: 10.1080/00268976.2014.912360] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
Affiliation(s)
- O.N. Ulenikov
- Institute of Physics and Technology, National Research Tomsk Polytechnic University, Tomsk, Russia
- Physics Department, National Research Tomsk State University, Tomsk, Russia
| | - E.S. Bekhtereva
- Institute of Physics and Technology, National Research Tomsk Polytechnic University, Tomsk, Russia
- Physics Department, National Research Tomsk State University, Tomsk, Russia
| | - A.L. Fomchenko
- Physics Department, National Research Tomsk State University, Tomsk, Russia
- Laboratoire Interdisciplinaire Carnot de Bourgogne, UMR CNRS 6303, Université de Bourgogne, Dijon, France
| | - A.G. Litvinovskaya
- Physics Department, National Research Tomsk State University, Tomsk, Russia
| | - C. Leroy
- Institute of Physics and Technology, National Research Tomsk Polytechnic University, Tomsk, Russia
- Laboratoire Interdisciplinaire Carnot de Bourgogne, UMR CNRS 6303, Université de Bourgogne, Dijon, France
| | - M. Quack
- Physical Chemistry, ETH-Zürich, CH-8093, Zürich, Switzerland
| |
Collapse
|
7
|
Cacciani P, Čermák P, Cosléou J, Romh JE, Hovorka J, Khelkhal M. Spectroscopy of ammonia in the range 6626–6805 cm−1: using temperature dependence towards a complete list of lower state energy transitions. Mol Phys 2014. [DOI: 10.1080/00268976.2014.924653] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
Affiliation(s)
- P. Cacciani
- Laboratoire de Physique des Lasers, Atomes et Molécules, CNRS, UMR 8523, Université Lille 1 , Villeneuve d’Ascq Cedex, France
| | - P. Čermák
- Department of Experimental Physics, Faculty of Mathematics, Physics and Informatics, Comenius University , Bratislava, Slovakia
| | - J. Cosléou
- Laboratoire de Physique des Lasers, Atomes et Molécules, CNRS, UMR 8523, Université Lille 1 , Villeneuve d’Ascq Cedex, France
| | - J. El Romh
- Laboratoire de Physique des Lasers, Atomes et Molécules, CNRS, UMR 8523, Université Lille 1 , Villeneuve d’Ascq Cedex, France
- Department of Molecular Quantum Mechanics and Modeling, Lebanese University (Hadath) , Beirut, Lebanon
| | - J. Hovorka
- Department of Experimental Physics, Faculty of Mathematics, Physics and Informatics, Comenius University , Bratislava, Slovakia
| | - M. Khelkhal
- Laboratoire de Physique des Lasers, Atomes et Molécules, CNRS, UMR 8523, Université Lille 1 , Villeneuve d’Ascq Cedex, France
| |
Collapse
|
8
|
Tyuterev V, Tashkun S, Rey M, Kochanov R, Nikitin A, Delahaye T. Accurate Spectroscopic Models for Methane Polyads Derived from a Potential Energy Surface Using High-Order Contact Transformations. J Phys Chem A 2013; 117:13779-805. [DOI: 10.1021/jp408116j] [Citation(s) in RCA: 107] [Impact Index Per Article: 9.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Vladimir Tyuterev
- GSMA,
UMR CNRS 7331, University of Reims, BP 1039, 51687 Reims Cedex 2, France
| | - Sergei Tashkun
- LTS, V.E. Zuev Institute of Atmospheric Optics, Academician Zuev square 1, 634021, Tomsk, Russia
| | - Michael Rey
- GSMA,
UMR CNRS 7331, University of Reims, BP 1039, 51687 Reims Cedex 2, France
| | - Roman Kochanov
- GSMA,
UMR CNRS 7331, University of Reims, BP 1039, 51687 Reims Cedex 2, France
- LTS, V.E. Zuev Institute of Atmospheric Optics, Academician Zuev square 1, 634021, Tomsk, Russia
| | - Andrei Nikitin
- GSMA,
UMR CNRS 7331, University of Reims, BP 1039, 51687 Reims Cedex 2, France
- LTS, V.E. Zuev Institute of Atmospheric Optics, Academician Zuev square 1, 634021, Tomsk, Russia
| | - Thibault Delahaye
- GSMA,
UMR CNRS 7331, University of Reims, BP 1039, 51687 Reims Cedex 2, France
| |
Collapse
|
9
|
Nikitin AV, Boudon V, Wenger C, Albert S, Brown LR, Bauerecker S, Quack M. High resolution spectroscopy and the first global analysis of the Tetradecad region of methane 12CH4. Phys Chem Chem Phys 2013; 15:10071-93. [DOI: 10.1039/c3cp50799h] [Citation(s) in RCA: 71] [Impact Index Per Article: 6.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
|
10
|
Tanner CM, Quack M. Reinvestigation of the ν2 + 2ν3subband in the overtone icosad of12CH4using cavity ring-down (CRD) spectroscopy of a supersonic jet expansion. Mol Phys 2012. [DOI: 10.1080/00268976.2012.702934] [Citation(s) in RCA: 26] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/28/2022]
|
11
|
Ulenikov O, Fomchenko A, Bekhtereva E, Gromova O, Leroy C. On the ‘expanded local mode’ approach applied to the methane molecule: isotopic substitution CH2D2←CH4. Mol Phys 2011. [DOI: 10.1080/00268976.2011.611479] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/16/2022]
|
12
|
Mondelain D, Kassi S, Jost R, Campargue A. The high sensitivity absorption spectrum of ozone (18O3 and 16O3) near 7800cm−1: Identification of the 3A2(000)–X(110) hot band superimposed to very weak vibrational bands. Chem Phys Lett 2011. [DOI: 10.1016/j.cplett.2011.05.043] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
|
13
|
Mondelain D, Kassi S, Wang L, Campargue A. The 1.28 μm transparency window of methane (7541–7919 cm−1): empirical line lists and temperature dependence (80 K–300 K). Phys Chem Chem Phys 2011; 13:7985-96. [DOI: 10.1039/c0cp02948c] [Citation(s) in RCA: 29] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Affiliation(s)
- D Mondelain
- Université Grenoble 1/CNRS, UMR5588 LIPhy, Grenoble, F-38041, France
| | | | | | | |
Collapse
|
14
|
Campargue A, Wang L, Liu A, Hu S, Kassi S. Empirical line parameters of methane in the 1.63–1.48μm transparency window by high sensitivity Cavity Ring Down Spectroscopy. Chem Phys 2010. [DOI: 10.1016/j.chemphys.2010.05.011] [Citation(s) in RCA: 35] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/19/2022]
|