The Hall effect for carriers released by light has been studied over a temperature range 4^∘{} to 114^∘{}K in additively colored crystals of KCl containing various concentrations of F centers. A negative Hall signal was observed corresponding to electrons released from F centers by light absorbed in the high-energy side of the F band. The Hall mobility rises steeply below 80^∘{}K due to freezing out of the optical modes of lattice vibration. A residual mobility near 4000 cm²/volt sec is found below 30^∘{}K in the crystals prepared so far.
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Brown et al. (1961) studied this question.
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