Global analysis of the high temperature infrared emission spectrum of (12)CH4 in the dyad (ν2/ν4) region

The Journal of Chemical Physics
B AmyayVincent Boudon

Abstract

We report new assignments of vibration-rotation line positions of methane ((12)CH4) in the so-called dyad (ν2/ν4) region (1100-1500 cm(-1)), and the resulting update of the vibration-rotation effective model of methane, previously reported by Nikitin et al. [Phys. Chem. Chem. Phys. 15, 10071 (2013)], up to and including the tetradecad. High resolution (0.01 cm(-1)) emission spectra of methane have been recorded up to about 1400 K using the high-enthalpy source developed at Institut de Physique de Rennes associated with the Fourier transform spectrometer of the SOLEIL synchrotron facility (AILES beamline). Analysis of these spectra allowed extending rotational assignments in the well-known cold band (dyad-ground state (GS)) and related hot bands in the pentad-dyad system (3000 cm(-1)) up to Jmax = 30 and 29, respectively. In addition, 8512 new transitions belonging to the octad-pentad (up to J = 28) and tetradecad-octad (up to J = 21) hot band systems were successfully identified. As a result, the MeCaSDa database of methane was significantly improved. The line positions assigned in this work, together with the information available in the literature, were fitted using 1096 effective parameters with a dimensionless standard devi...Continue Reading

References

Feb 25, 1998·Journal of Molecular Spectroscopy·R GeorgesO Robert
Nov 30, 1999·Journal of Molecular Spectroscopy·N CheblalV Boudon
May 7, 2002·Spectrochimica Acta. Part A, Molecular and Biomolecular Spectroscopy·David W Schwenke
Mar 21, 2008·Nature·Mark R SwainGiovanna Tinetti
May 30, 2013·Physical Chemistry Chemical Physics : PCCP·A V NikitinM Quack
Jul 1, 2014·Proceedings of the National Academy of Sciences of the United States of America·Sergei N YurchenkoGiovanna Tinetti
Dec 18, 2014·Science·Christopher R WebsterUNKNOWN MSL Science Team
Jan 27, 2015·Proceedings of the National Academy of Sciences of the United States of America·Kathryn McKainSteven C Wofsy

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Citations

Sep 17, 2016·The Journal of Chemical Physics·Alec OwensWalter Thiel
Oct 4, 2018·The Journal of Chemical Physics·Andrei V NikitinVladimir G Tyuterev

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