Electronic states on the surface of zinc sulfide crystal phosphors

Abstract

An optical method of heterogeneous spectroscopy of the surface has been developed, which makes it possible to determine the energy position of electronic states on the surface itself of wideband solid bodies. The method is based on a new phenomenon discovered by us which is a highly efficient heterogeneous electronic accommodation of the energy of heterogeneous chemical reactions; it consists specifically in an increase, by 3–5 orders of magnitude, in the rate of generation of electrons by reaction energy to the C-zone of a crystal existing in the metastable state as compared with an unexcited specimen. We have determined the energy denths of electronic states that participate in accommodation of the reaction energy of heterogeneous recombination of atoms for a large number of zinc sulfide crystal phosphors.