Measurements and modeling of N2-broadening coefficients for the ν6 band of CH3F, comparison with CH3Cl and CH3Br molecules

• Published in: Journal of quantitative spectroscopy & radiative transfer 2017-12, Vol.203, p.480-489
• Main Authors: Ramchani, A. Barbouchi, Jacquemart, D., Soulard, P., Guinet, M.
• Format: Article
• Language: English
• Subjects: J and K-dependences; Methyl fluoride; N2-broadening coefficients; Physics; ν6 band
• ISSN: 0022-4073; 1879-1352
• DOI: 10.1016/j.jqsrt.2017.06.013

•Fourier transform spectroscopy of the ν6 band of methyl fluoride at room temperature.•N2-broadening coefficients for 899 transitions.•Comparison between our measurements and calculations with those from literature.•Comparison of N2-broadening coefficients with CH3Br and CH3Cl molecules. The 8.5-µm spectral region of methyl fluoride was recently studied in terms of line positions, intensities and self-broadening coefficients at room temperature [JQSRT 2016;185:58–69]. The present work is dedicated to measurements of N2-broadening coefficients for transitions of the ν6 band. Based on new set of Fourier transform spectra using various mixtures of CH3F and N2, a multispectrum fitting procedure was used to retrieve N2-broadening for 1189 transitions between 1105 and 1291 cm−1. 899 transitions have been studied to model the J- and K-rotational quantum number dependences of the N2-broadening coefficients in order to generate any transitions of CH3F assuming no vibrational dependence. The accuracy of the retained N2-broadening coefficients was estimated to be between 2–5%. These measurements have been compared with previous studies from the literature obtained for other bands of CH3F. Comparison with the results obtained for similar empirical J- and K-rotational model applied to CH3Cl, CH3Br and CH3F (this work) molecules is also presented. [Display omitted]