Vibronic side bands of Sm²⁺ in alkali halides

Abstract

The calculation of vibronic side bands of defects in crystals is discussed. A model for the deformation of the lattice about a Sm 2+ defect in alkali halides and side-band calculations on this model for KBr and KCl containing Sm 2+ are compared with experimentally observed side bands. Improvements, particularly in the low frequency region, are found over the calculations assuming no deformation.