Anisotropy of the electron density and effective charge in alkali halide monocrystals

We discuss the use of the positron annihilation method to study the electron structure of alkali halide monocrystals, particularly the electron density and the effective charge of the ions. The distribution of electron density and the values of the effective ion charge are found experimentally for two crystallographic directions, 110 and 100, in a KBr monocrystal. On the basis of the data obtained it is concluded that this is an effective method for obtaining information about the anisotropy of electron states in the crystal.Translated from Izvestiya Uchebnykh Zavedenii, Fizika, No. 5, pp. 34–37, May, 1972.