After the EL2 absorption band at 1.2 eV is fully photoquenched [i.e., EL2 defect completely transferred from the normal (EL20) to metastable (EL2*) state] it can be partially recovered by photon excitation. This EL2*→EL20 recovery exhibits peaks at 0.80 and 0.90 eV with shoulders at 0.86 and 0.94 eV. Comparison is made to the previously published photon-induced photoconductivity recovery and the results are used to construct a modified configuration coordinate model for the EL2 defect.
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David W. Fischer (1987) studied this question.
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