Accurate variational high-resolution spectra calculations in the range 0-8000 cm−1 are reported for the first time for the monodeutered methane (12CH3D). Global calculations were performed by using recent ab initio surfaces for line positions and line intensities derived from the main isotopologue 12CH4. Calculation of excited vibrational levels and high-J rovibrational states is described by using the normal mode Eckart-Watson Hamiltonian combined with irreducible tensor formalism and appropriate numerical procedures for solving the quantum nuclear motion problem. The isotopic H→D substitution is studied in details by means of symmetry and nonlinear normal mode coordinate transformations. Theoretical spectra predictions are given up to J = 25 and compared with the HITRAN 2012 database representing a compilation of line lists derived from analyses of experimental spectra. The results are in very good agreement with available empirical data suggesting that a large number of yet unassigned lines in observed spectra could be identified and modeled using the present approach.
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28 July 2014
Research Article|
July 31 2014
Accurate first-principles calculations for 12CH3D infrared spectra from isotopic and symmetry transformations
Michaël Rey;
Michaël Rey
a)
1
Groupe de Spectrométrie Moléculaire et Atmosphérique
, UMR CNRS 6089, BP 1039, F-51687, Reims Cedex 2, France
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Andrei V. Nikitin;
Andrei V. Nikitin
2Laboratory of Theoretical Spectroscopy,
Institute of Atmospheric Optics
, SB RAS, 634055 Tomsk, Russia
3
Tomsk State University
, 36 Lenin Avenue, 634050 Tomsk, Russia
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Vladimir G. Tyuterev
Vladimir G. Tyuterev
1
Groupe de Spectrométrie Moléculaire et Atmosphérique
, UMR CNRS 6089, BP 1039, F-51687, Reims Cedex 2, France
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a)
Electronic mail: [email protected]
J. Chem. Phys. 141, 044316 (2014)
Article history
Received:
May 14 2014
Accepted:
July 11 2014
Citation
Michaël Rey, Andrei V. Nikitin, Vladimir G. Tyuterev; Accurate first-principles calculations for 12CH3D infrared spectra from isotopic and symmetry transformations. J. Chem. Phys. 28 July 2014; 141 (4): 044316. https://doi.org/10.1063/1.4890956
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