A comparison between calculated and experimental relaxation phenomena in binary gaseous mixtures N₂-He, Ne and Ar

Abstract

The usefulness of available anisotropic potential energy surfaces for the calculation of collision cross sections governing relaxation phenomena is considered for binary mixtures of N₂ with the noble gases He, Ne and Ar. The relaxation phenomena specifically considered are collision broadening of the depolarized Raman and Rayleigh spectra of scattered light. In addition, the relaxation cross section associated with the position on the magnetic field by pressure, B/p, axis of the viscomagnetic effect in such binary mixtures is examined. Six N₂-He potentials, eight N₂-Ne potentials and seven N₂-Ar potentials have been considered in the present study. Of the N₂-He potentials, one is satisfactory as far as these relaxation phenomena are concerned; a set of six Hartree-Fock plus damped dispersion (HFD) potentials seem to be reasonable for the N₂-Ne system, and three HFD potentials seem reasonable for the N₂-Ar system. However, when the present results are combined with transport property requirements, only one of the N₂-Ne and none of the N₂-Ar potentials are able to predict all the transport coefficients and relaxation cross sections considered in our study.

Work started in 1984 while two of the authors were at the Department of Chemical Engineering and Chemical Technology, Imperial College, London, U.K.

Work started in 1984 while two of the authors were at the Department of Chemical Engineering and Chemical Technology, Imperial College, London, U.K.

Notes

Work started in 1984 while two of the authors were at the Department of Chemical Engineering and Chemical Technology, Imperial College, London, U.K.

Additional information

Notes on contributors

Gregory C. Corey

NSERC of Canada University Research Fellow