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The CH4 absorption spectra at low temperature and in nonopores
Author(s): L. N. Sinitsa; A. A. Lugovskoi; N. M. Emel`yanov; A. A. Tanichev
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Paper Abstract

The methane absorption spectra in the range between 6600 and 9200 cm-1 have been recorded at 296 K and 109 K by the Fourier spectrometer IFS – 125M at pressures from 11 to 300 mbar, and spectral resolution 0.03 cm-1. Low temperature cell with a length of 220 cm was used, which provided the threshold sensitivity to absorption of the order of 10-7 cm-1. Empirical values of the lower state energy level were derived from the intensity ratios of the lines measured at 200 K and 296 K. Line assignment of the the 3ν3 band of the 12CH4 molecule was performed. The parameters of Voigt, SDV, HTP contours (the line center, intensity) were determined at 296K.

Paper Details

Date Published: 18 December 2019
PDF: 10 pages
Proc. SPIE 11208, 25th International Symposium on Atmospheric and Ocean Optics: Atmospheric Physics, 112080N (18 December 2019); doi: 10.1117/12.2540939
Show Author Affiliations
L. N. Sinitsa, V. E. Zuev Institute of Atmospheric Optics (Russian Federation)
A. A. Lugovskoi, V. E. Zuev Institute of Atmospheric Optics (Russian Federation)
N. M. Emel`yanov, V. E. Zuev Institute of Atmospheric Optics (Russian Federation)
A. A. Tanichev, V. E. Zuev Institute of Atmospheric Optics (Russian Federation)


Published in SPIE Proceedings Vol. 11208:
25th International Symposium on Atmospheric and Ocean Optics: Atmospheric Physics
Oleg A. Romanovskii; Gennadii G. Matvienko, Editor(s)

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