SEMICLASSICAL LINE MIXING ANALYSIS IN THE FIRST OVERTONE BAND OF CO COMPRESSED BY N-2

Infrared spectra of the 2<--0 absorption band of CO compressed by N-2 at various densities up to 456 Amagat and at temperatures of 296, 188 and 122 K have been analyzed. To interpret these spectra we have appli ed a semiclassical model with adiabatic corrections which accounts for the line-mixing effects. This model provides a satisfactory agreement with experimental bandshapes for all temperatures, especially for the lower N-2 densities. The discrepancy arising at higher densities may be due to imperfections of the calculated relaxation matrix and/or to the non-validity of the impact and binary collision approximations.