Raman bands of fluid N₂

Abstract

Molecular dynamic simulations and experimental measurements on Raman bands of fluid N₂ at about 150 K and two densities (1·05 and 1·8 times the critical density) are reported. Induced effects are accounted for by the dipole-induced-dipole mechanism at the first order. A satisfactory agreement between time correlation functions and spectral shapes derived from simulation and experiment is obtained. A detailed analysis of the different contributions to the total correlation function is reported, either performing or without performing the projection of the collision induced polarizability onto the orientational variables. The density dependence of static and dynamical properties is discussed together with the role played by the cross and pure collision induced contributions. The approximation of neglecting all orientational correlation is successfully used for the estimate of the pure collision induced terms.

Notes

Work partially supported by GNSM (CNR) and MPI.