Abstract

The recently published drift velocity measurements of excess electrons in solid Ar, Kr, and Xe show a complete saturation of the drift velocity with applied field between ${10}^{4}$ and ${10}^{5}$ V ${\mathrm{cm}}^{\ensuremath{-}1}$. In this paper it is suggested that the interaction of the conduction electrons with the periodic structure is the basic velocity-limiting mechanism in these solids. The model is supported by a simple calculation in which an energy-dependent effective mass is included in the Shockley hot electron theory. The computed field dependence of the drift velocity, involving one adjustable parameter, is in good agreement with the observed curves for solid Ar, Kr, and Xe over the complete range of applied fields.

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