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A correlated set of experiments was performed with a view to study the effect of trivalent bismuth upon some properties of NaCl, KCl and RbCl crystals. For NaCl the effect of BiO+ ions was also investigated. It was stated that: 1. The hydrolytic properties of bismuth are responsible for the formation of BiO+ centres also in crystals doped with Bi3+ ions. 2. During all experiments performed, the dopant remains in the form of trivalent cations. 3. Optical absorption spectra of bismuth are similar to those characteristic of other heavy metal ions with the s2 electronic configuration. 4. The charge excess of Bi3+ ions is compensated by cation vacancies whereas for BiO+ ions the preferential bonding between Bi3+ and O2- serves for the charge compensation.

Investigations of Defect Centres in Alkali Halides Doped with Trivalent Cations. Part 1: Bismuth in NaCl, KCl and RbCl Crystals