Abstract
The reflection and absorption edge spectra in Hg 2 I 2 and Hg 2 Br 2 single crystals were measured in the visible and near ultraviolet region at various temperatures. The exciton transition of the lowest energy was assigned as the direct transition for E // c between the bonding and antibonding states of the Hg-Hg bond. The high temperature steepness constant was obtained to be 0.53 in Hg 2 I 2 from the analysis of the absorption edge, suggesting the strong exciton–LO phonon interaction in this crystal.
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