CO2-broadening and shift coefficients in the ν3 and ν2+(ν4+ν5)+0 bands of acetylene. (March 2018) - Lyulin, O.M.
Highlights: CO2 -broadening and shift coefficients of 119 lines of the acetylene ν3 and ν 2 + ( ν 4 + ν 5 ) + 0 bands are measured. Both CO2 -broadening and shift coefficients of the acetylene ν3 and ν 2 + ( ν 4 + ν 5 ) + 0 bands have very close values. Polynomial equation describing the rotational dependence of the broadening coefficients is suggested. Abstract: The absorption spectra of the mixture of C2 H2 and CO2 at different partial pressures of both gases have been recorded at room temperature in the 3 µm region using the 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 acetylene spectral lines. The CO2 broadening and pressure induced shift coefficients for 119 lines of the ν3 and ν 2 + ( ν 4 + ν 5 ) + 0 bands of acetylene have been derived. The rotational dependence of the values of these coefficients is discussed. The comparison of the obtained coefficients to those published by other authors for the ν1 + ν3 and ( ν 4 + ν 5 ) + 0 bands is performed.