Abstract
Lattice relaxation accompanying phototransformation of In bistable centers from the ground, deep state to the shallow state in CdF2 crystal has been measured with the use of scanning tunnelling microscope. It is shown that relatively small macroscopic changes of the crystal length in the order of 1.8 x 10 -6 accompany the phototransformation of In ions. Lattice expansion upon the influence of population of shallow donor levels in CdF2 explains the observed small changes of lattice constant during the process.
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