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Abstract
The possible importance of $F$-center states in alkali halides associated with the energy-band minimum at ${X}_{3}$ in the Brillouin zone is discussed. The coexistence of these states with the "traditional" $F$-center states associated with ${\ensuremath{\Gamma}}_{1}$ may lead to new and interesting phenomena. In particular, it is speculated that the discrepancy between radiative lifetime and ground-state repopulation time observed by Fulton in the CsF $F$ center can be resolved by including ${X}_{3}$ $F$-center states.
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