Abstract
The ratio of intensities of inverse hydrogenlike series (IHS) luminescence bands which are due to two-electron transitions in an excitonic molecule (EM) have been calculated. The rates of two-photon and two-electron spontaneous transitions in the excitonic molecule have been estimated. Their ratio has been obtained as 0.13. The correlation between theoretical estimations and experimental results obtained from the luminescence spectra of β - ZnP 2 crystals has been analyzed.
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