Foreign-Gas-Broadening Effects in the 15 μm CO2 Bands

The effects of N2, O2 Ar, and He on the absorption of radiation by the 15 μm perpendicular CO2 bands are reported. The investigation was carried out at medium resolution and at gas pressures less than 1 atm. The results of the study are presented in the form of a band-averaged broadening coefficient for N2, band-averaged broadening factors for O2 Ar, and He, and wavelength dependent broadening coefficients for N2, O2 Ar, and He. Comparisons are made with other experimental and theoretical results. In addition transmittances were calculated for homogeneous paths using some of the molecular parameters determined in the study and compared with measured transmittances. The agreement was reasonably satisfactory and revised values for the intensities of some of the 15 μm bands are presented.