Problem of intercollisional correlation in vibration-rotation spectra of molecules

Abstract The shapes of vibration-rotation bands are studied considering the statistical dependence between the moments of occurring of different collisions (intercollisional correlation). The expression for the shape of spectral lines has been obtained describing the influence of intercollisional correlation on the absorption in the frequency range near the centers of lines. Modeling of the distribution function for the intervals between adjacent collisions has been carried out. Numerical calculations of the absorption coefficient in the vibration-rotation bands of CO and N 2 O have been performed using the proposed model for the line shape. Comparison between calculated results and available experimental data for the absorption at high pressures shows that the present model can adequately explain molecular absorption in compressed gases.