Line shape in the low-frequency wing of self-broadened CO_2 lines

The shape of the far wings of self-broadened CO(2) lines has been investigated in the spectral region (2140-2250 cm(-1).), i.e., on the low wavenumber side of the lines of the most intense band (upsilon(3) of(12)C(16)O(2)). The experimental results have been compared to calculated values based on the AFGL 1982 compilation. From this comparison it appears that the wings of the lines on the low wavenumber side of the centers decay much more rapidly than do Lorentz lines, by about the same amount as has been previously shown for the high wavenumber side. However, an asymmetrical correcting line shape factor is needed to obtain good agreement between experimental and synthetic spectra.