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The binding energy of excitons to neutral donors in the approximation of spherical, nondegenerate energy bands, is calculated by a variational method for relevant range of electron-to-hole mass ratio. Estimated relative intensities of LO-phonon replicas of radiative recombination of the exciton-neutral-donor complex are in fair agreement with measured intensities of fluorescent lines.
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Ungier et al. (1981) studied this question.
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