Transport Properties of Spin-Polarized Atomic Hydrogen Using Generalized Scattering Theory

Abstract

Our results for the scattering and thermophysical properties of spin-polarized atomic hydrogen \((\hbox {H}{\downarrow })\) have been presented in the temperature range 0.01–10 K using the Galitskii–Migdal–Feynman formalism. These results include the quantum second virial coefficient, the average total and viscosity cross sections, the viscosity, the diffusion coefficient, and the thermal conductivity. The calculations have been undertaken using three triplet-state potentials: Morse-type, Silvera and Born–Oppenheimer potentials. The Morse potential is less attractive and very simple, but less accurate to describe spin-polarized atomic hydrogen. That explains the differences between it and the other two potentials, which are clearly better. From the results of the average total cross sections, it is concluded the \(\hbox {H}{\downarrow }\) remains a gas even at low temperature. The viscosity, the thermal conductivity, and the diffusion coefficients of \(\hbox {H}{\downarrow }\) increase in all cases with increasing temperature.