Abstract
The luminescence at 0.839 eV in GaAs:Cr is interpreted as a split 5E-5T2 transition within the Cr2+ ion. The degeneracies are removed by first- and second-order trigonal-field and spin-orbit-coupling perturbations. The parameters appearing in the effective Hamiltonians for 5E and 5T2 are all deduced from the high-resolution photoluminescence spectroscopy of Barrau and co-workers (1982); the fit of the energy levels and oscillator strengths provides a very accurate solution. The electronic and Jahn-Teller parameters are deduced. These results lead to a complete interpretation of the magnetic field Zeeman splittings of Eaves (1980), Killoran and co-workers (1980). The accuracy of the interpretation of all the experimental results represents an important improvement on previous models. In particular, the authors show how the interpretation of the ground state a 5E (C3v) is a poor approximation to the results presented.
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