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In CdS, CdSe, and CdTe investigations of both reflectivity – by polarimetric methods – and transmission are made in the spectral region of energies higher than the exciton ground state. An additional structure at energies of approximate E ex + E LO is explained by indirect exciton transitions with phonon emission and compared with simple second‐order perturbation theory taking into account ground exciton states only. The observed shift towards lower energies can be ascribed to the configuration interaction.
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Dillinger et al. (1968) studied this question.
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