Abstract
The magnetic circular dichroism has been in the past an excellent tool to clarify the optical cycle of theF centres in alkali halides and the nature of the relaxed excited state. We have used such technique to study the weak doubleF emission found recently in NaI and the luminescence ofF andFA centres (of both type I and II) in KCl. We have found that the long-wavelengthF emission in NaI and theFA(I) emission in KCl∶Na+ behave like the well-known emission of theF centres, confirming the attribution of the above luminescence in NaI to the normal relaxed excited state. A completely different behaviour is displayed by the short-wavelengthF emission in NaI and by theFA(II) emission in KCl∶Li+. The experimental data have been compared with the Ham and Grevsmuhl vibronic theory of the relaxed excited state.
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