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Electronic and vibronic states of the acceptor–bound-exciton complex (,X) in CdS. III. High-density electronic resonant Raman scattering at the (,X) complex
Phys. Rev. B 31, 3621 – Published 15 March, 1985
DOI: https://doi.org/10.1103/PhysRevB.31.3621
Abstract
A very strong high-density resonant Raman effect in the bound-exciton region of CdS is explained by electronic B→A hole conversion within the (,X) configuration. The (,) states with one hole from the second B valence band analyzed in paper II of this series [J. Gutowski, preceding paper, Phys. Rev. B 31, 3611 (1985)] act as resonance terms for the incoming photon while the (,) ground state, involving two A valence-band holes and occupied after the conversion process, forms a resonance term for the scattered light. On the one hand, our model developed in the preceding paper for the (,X) complex in CdS is able to explain the scattering process excellently. On the other hand, the resonant Raman scattering is a useful tool for analyzing the highly sensitive dependence of the (,X) configuration on the excitation parameters. Thus the spatial dimensions of the complex alter with the energy that is available for its creation. Moreover, high-density excitation results in a stimulation of the Raman transitions. Laser activity of the Raman light becomes observable above a certain threshold of the excitation intensity.
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