Abstract

Subpicosecond time-resolved transient grating and transient absorption experiments were performed in mercuric iodide, a wide bandgap semiconductor. Sub-bandgap excitation in the Urbach tail induces an index grating which forms in about 2 ps and which exhibits biexponential decay with time constants 60 ps and 1 .5ns. We ascribe this change in the index of refraction to the formation of defect states. In addition, coherent Raman excitation of the 1 14 cm1 Aig lattice mode was observed.

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