Quasifree electron transport under electric field in nonpolar simple-structured condensed matters

Drift behaviours of quasifree electrons in nonpolar condensed matters (dense gases, liquids and solids) under uniform electric fields are reported in this review. Measurements have shown that, in some sorts of nonpolar fluid, zero-field electron mobility depends strongly on the number density of atom or molecule comprising the matters from dilute gas to solid phase. The dependence was explained by the fact that in the condensed phase new energy levels of the valence electrons are formed through a regular spatial arrangement of long-range order, the crystal lattice, due to the Pauli exclusion principle, and that excess electrons move in the conduction band. The electron drift motion under the fields in the conduction band is also described. (topical review)