Theory of collision induced absorption in dense rare gas mixtures

Abstract

Correlation functions and spectral densities associated with the collision induced absorption of dense rare gas mixtures are generated by the Zwanzig-Mori theory. Two modes are theoretically predicted. A diffusive mode, due to the mutual diffusion of rare gas atoms, creates a low frequency dip in the line shape. An oscillatory mode, due to the oscillations of atoms in the fluid mixture, generates a caging spike in the wing of the spectrum.