ELECTRON-LATTICE INTERACTION IN ABSORPTION SPECTRA OF THALLIUM DOPED ALKALI HALIDES

The electron-lattice interaction of NaCl:Tl+, KCl:Tl+, KBr:Tl+, and KI:Tl+ is discussed using the moments of the absorption bands. The discussion is based on a theory of Toyozawa and Inoue and Honma. Consistency of the data is found for the absorption measurements. An analysis of the band shift under applied stress shows for the A-band in KCl and KBr and for the A- and B-band in KI that the electronlattice coupling constants derived from these data assuming next neighbour interaction differ considerably from those derived from the second moments of the bands. © 1969 Springer-Verlag.