Molecular dynamics simulations of depolarized Rayleigh scattering from liquid argon at the triple point

The depolarized Rayleigh spectrum of liquid argon at the triple point has been calculated using molecular dynamics simulations. In these calculations, it is necessary to truncate the pair polarizability anisotropy at some finite value, and it has been found that the intensity of the spectrum at liquid densities is an oscillatory function of this truncation. Despite the resulting difficulty in estimating the intensity of the dipole-induced-dipole (DID) spectrum, it is apparently several times larger than the experimental result. The truncation of the anisotropy also affects the time correlation functions beyond about 0.1 psec, and thereby the simulated band shapes. An approximate model of depolarized light scattering is used to help analyze the dependence of the integrated intensity of the DID spectrum on the truncation of the anisotropy.