The P-branch of methane's ν3 band is probed to carry out an extensive study of the 2905-2908cm-1 infrared spectral region. Absolute line intensities as well as N2-, O2-, H2-, He-, Ar- and CO2-broadening coefficients are determined for nine transitions at room temperature. Narrowing parameters due to the Dicke effect have also been investigated. A narrow emission line-width (~0.0001cm-1) difference-frequency-generation (DFG) laser system is used as the tunable light source. To retrieve the CH4 spectroscopic parameters, Voigt and Galatry profiles were used to simulate the measured line shape of the individual transitions.
|Original language||English (US)|
|Number of pages||12|
|Journal||Journal of Quantitative Spectroscopy and Radiative Transfer|
|State||Published - Dec 2014|
ASJC Scopus subject areas
- Atomic and Molecular Physics, and Optics