Abstract

Recently Gellerman et al.1 discovered highly stable laser-active color centers based on TI impurities in alkali halide host crystals, and they have called these FA III centers. However, our own investigations of the new centers show that they are instead neutral TI atoms perturbed by the field of an adjacent anion vacancy or so-called TI0(1) centers.2 The argument is as follows: First recall that the electronic configuration of neutral TI is a single p electron outside a closed shell.

© 1982 Optical Society of America

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