Measurements of the broadening and shift parameters of methane spectral lines in the 5550-6140 cm~(-1) region induced by pressure of carbon dioxide

摘要

The absorption spectra of a mixture of CH_4 with CO_2 at different partial pressures of both gases have been recorded at room temperature in the 5390-6200 cm~(-1) region using a Bruker IFS 125 HR FTIR spectrometer. The multispectrum fitting procedure has been applied to these spectra to recover the broadening and shift parameters of the methane spectral lines. The CO_2 broadening and pressure induced shift coefficients, respectively, for 533 and 386 CH_4 spectral lines with good values of the signal to noise ratio have been derived. The rotational dependence of the values of these coefficients is discussed.