Ultraviolet absorptions of non-stoichiometric lead chloride PbCl2

Abstract

Tempering evaporated lead chloride films in a nitrogen atmosphere without or with excess lead or chlorine results in extra absorption bands between 268 and 360 mμ and at about 253 mμ, and in a change of the existing absorption at 265.5 mμ (measured at liquid nitrogen temperature). These absorption are discussed in terms of transitions of electrons near single or clustered chloride ion vacancies.