Abstract
When divalent titanium (d 2) is incorporated into MnCl 2, the 1E g (D 3d notation) level of the guest ion is the lowest energy- excited state. In this paper we show that exchange effects play a dominant role in both the absorption and emission spectra. Using a one parameter model based on a Ti 2+ (Mn 2+) 6 spin cluster an excellent agreement can be obtained between the calculated ground-state multiplet and the observed temperature-dependent absorption spectra. The emission spectrum, on the other hand, only agrees with the predictions of the model at temperatures above ∼20K. At lower temperatures a number of completely new features are found which indicate that emission is taking place into a magnetically unrelaxed ground state. This is rationalised in terms of magnetic Franck-Condon transitions which arise as a result of Ti 2+ being magnetically decoupled in the excited state. These phenomena are studied in an applied magnetic field.
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