Abstract
Spin—orbit splitting of the first excited state of the F center is estimated in the simple effective-mass approximation. The splitting due to the outermost s orbitals of the atoms neighboring the vacancy in the crystal is related to the splitting of the p state in the free atom. As an example, spin—orbit splitting of the F center in cesium halides is estimated. It is found to 4-to-6 orders of magnitude too small to account for the structure observed in the F-center absorption band in cesium halides.
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