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- Because of the reconstruction of the defect surroundings after a charge change, Stokes shifts, especially strong in oxide crystals, between the optical and the thermal defect levels result. For brevity we do not make a distinction between both types of levels here
- This is caused by charge transfer absorptions. The corresponding bands are usually much stronger than internal transitions at a defect ion, such as crystal field transitions. Absorption changes due to the latter thus will not be observed
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