Abstract
Resonance Raman scattering in AgCl is investigated at 1.8K for excitation around the indirect exciton absorption edge. The observed scattering processes involve pairs of momentum-conserving TA(L) and LA(L) phonons with energies of 8.2 and 12.9 meV, respectively. The weakness of the scattered intensity is explained by a reduction of free-exciton lifetime due to self-trapping. The quantitative analysis of the scattered intensity as a function of exciton kinetic energy reveals that, besides self-trapping as the most important relaxation mechanism, intravalley scattering by long-wavelength LA and LO phonons and intervalley scattering by TA(X) and LA(X) phonons are effective. Relative exciton-phonon matrix elements and scattering probabilities are determined. An estimate is made for the effective mass and total lifetime of the free exciton giving M*=(2.4+or-1.2)me and tau tot=65 ps, respectively.
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