Abstract
In a series of three papers (1981) the authors have recently proposed a coherent interpretation of different experimental results on the defect emitting a no-phonon luminescence at 0.84 eV in GaAs:Cr. According to the model, the transitions arise from a substitutional Cr2+ ion on a Ga site submitted to a perturbation having C3v symmetry but in which this trigonal effect is completely quenched in the ground set of states. This perturbation is induced by another defect present in the neighbourhood. In this paper they present a more precise study of the centre in its ground set of states. They extend the theory to try to interpret some phonon scattering experiments, but the complexity of the data prevents us from getting definitive conclusions on this point. The authors also present theoretical Zeeman splitting of the luminescence spectrum in the (110) direction, a result not given in their previous work.
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