Abstract
Optical absorption and magnetic circular dichroism (MCD) spectra of KCl:Ga+ in the region of the A and B bands have been measured over the temperature range 4.5-210K. Moments of the lineshape of the resolved A and B bands have been determined up to the fourth moment for absorption and up to the third moment for MCD. The lineshape of both the absorption and MCD spectra in the A and B region have been calculated theoretically using a model that includes spin-orbit coupling and the dynamical Jahn-Teller coupling to modes of A1g, Eg, and T2g symmetry. Because of difficulties connected with the determination of the first and third MCD moments for the A band, the coupling constants could not be determined completely from the experimental data. Calculated absorption spectra are in quite reasonable agreement with experiment over a range of temperatures. The lineshape of the MCD spectrum agrees less well with experiment and this emphasises the greater sensitivity of the MCD spectrum to fine details of the theoretical model employed.
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