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

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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.