Abstract
Subpicosecond time-resolved transient grating experiments were performed in mercuric iodide, a wide bandgap semiconductor. Hot carriers created by two-photon absorption cooled within a few picoseconds to form the free excition. The free excition lifetime was 1.8 ± 0.2 ns. Coherent Raman excitation of the 114 cm−1 A1g lattice mode was observed.
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