Vibrational frequency shifts of fluid nitrogen up to ultrahigh temperatures and pressures

Abstract

Vibrational frequency shift measurements in fluid nitrogen (over a temperature range of 77K<T< 3521 K and a pressure range of 1 bar<P<158 kbar) are used to test the predictions of a generalized pertured hard sphere fluid theory. The experimental data include new Raman scattering measurements, up to near the freezing density of N 2 at 295 K, as well as previous static and shocked high-pressure and temperature measurements. These are comparcd with the predictions of a theory which independently treats the effects of short range repulsive, long range attractive, and centrifugal forces. Repulsive solvation forces are modeled using the cavity distribution function of a reference hard sphere fluid