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