Rotational velocity correlation function for assessing molecular models for gas and liquid phase studies

Abstract

The rotational velocity correlation function 〈u(0)·[graphic omitted]u_i(t)〉(RVCF) is used to assess two analytical models of the molecular motion which gives rise to far infra-red (2–200 cm^–1) absorptions in dipolar compressed gases and liquids. These functions are compared with those derived from the experimental data, and the discrepancies attributed largely to induced, temporary dipoles, the short time (< 2 ps) behaviour of which being more clearly reflected in these short time correlation functions than in the corresponding vectorial ones.