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When an exciton absorption overlaps a continuum background absorption, the exciton line is broadened and interferes with the background. The interference effect is investigated for an exciton superposed on the continuum absorption of its spin-orbit partner channel. For that case it is shown that the electron-hole exchange interaction is the important factor for the interference. A line-shape formula is derived which properly takes account of the interference caused by the exchange interaction, and the result is compared with experiment for NaBr with reasonable agreement.
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Yositaka Onodera (1971) studied this question.
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