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

- Absorption spectra of CH4 broadened by pressure of CO2 between 5390 and 6200 cm−1.
- CO2 broadening coefficients of 533 methane spectral lines are measured.
- CO2 pressure induced shift coefficients of 386 methane spectral lines are measured.
- Equation describing rotational dependence of broadening coefficients is suggested.

The absorption spectra of a mixture of CH4 with CO2 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 CO2 broadening and pressure induced shift coefficients, respectively, for 533 and 386 CH4 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.