A semiclassical theory of the mobility of excess electrons in gaseous He is given. The electron-He interaction is treated via an effective Wigner-Seitz potential. Departures of the mobility from classical kinetic theory are explained by two mechanisms: first, scattering of electrons from fluctuations in the effective potential, and second, formation of low-mobility localized states in deep potential wells. Two parameters are introduced in the theory, and by adjusting them we get good agreement with the experimental values of Levine and Sanders.
All Science Journal Classification (ASJC) codes
- Physics and Astronomy(all)