The CH4  absorption spectra at low temperature and in nonopores

L. N. Sinitsa; A. A. Lugovskoi; N. M. Emel`yanov; A. A. Tanichev

doi:10.1117/12.2540939

18 December 2019 The CH₄ absorption spectra at low temperature and in nonopores

L. N. Sinitsa, A. A. Lugovskoi, N. M. Emel`yanov, A. A. Tanichev

Proceedings Volume 11208, 25th International Symposium on Atmospheric and Ocean Optics: Atmospheric Physics; 112080N (2019) https://doi.org/10.1117/12.2540939
Event: XXV International Symposium, Atmospheric and Ocean Optics, Atmospheric Physics, 2019, Novosibirsk, Russian Federation

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.

Citation Download Citation

L. N. Sinitsa, A. A. Lugovskoi, N. M. Emel`yanov, and A. A. Tanichev "The CH₄ absorption spectra at low temperature and in nonopores", Proc. SPIE 11208, 25th International Symposium on Atmospheric and Ocean Optics: Atmospheric Physics, 112080N (18 December 2019); https://doi.org/10.1117/12.2540939

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