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CO2-broadening coefficients in the ν3 fundamental band of methane.
- Source :
-
Journal of Molecular Spectroscopy . Jun2019, Vol. 360, p1-6. 6p. - Publication Year :
- 2019
-
Abstract
- • Determination of CO 2 -broadening coefficients of lines in the ν 3 band of methane. • The half-widths were measured using a high resolution diode-laser spectrometer. • The parameters were deduced from the Voigt, Rautian-Sobel'man and Galatry profiles. In this paper, CO 2 -broadening coefficients of 11 lines in the ν 3 band of CH 4 , located between 2906 and 2959 cm−1, were measured at room temperature using an improved tunable diode-laser spectrometer. Each line was recorded for 4 different pressures, ranging from 20.15 to 60.20 mbar. The experimental determination of the CO 2 -broadening coefficients was performed by fitting a theoretical profile on the experimental line shape for each line recorded at each pressure. The Voigt, Rautian-Sobel'man and Galatry models were therefore used. The ratio between the present CO 2 -broadened results and the data available in the literature for air-broadening is investigated and compared to the ratio between N 2 - and air-broadening. The γ CO 2 / γ air presents significant differences with the ratio γ N 2 / γ air as well as a large scattering. This shows the need to make dedicated studies, both experimentally and theoretically, for CO 2 -broadening coefficients. [ABSTRACT FROM AUTHOR]
- Subjects :
- *METHANE
*SPECTROMETERS
*CARBON dioxide
Subjects
Details
- Language :
- English
- ISSN :
- 00222852
- Volume :
- 360
- Database :
- Academic Search Index
- Journal :
- Journal of Molecular Spectroscopy
- Publication Type :
- Academic Journal
- Accession number :
- 136541895
- Full Text :
- https://doi.org/10.1016/j.jms.2018.12.004