Abstract
A formula is given for the time-resolved spectrum of the resonantly- scattered radiation from an exciton-phonon system, and it is applied to the calculation of two-LO-phonon assisted spectrum. Both the Raman component associated with virtual intermediate states and the luminescence with real intermediate states are obtained. A Raman-like component with an oscillatory behavior can be seen, when the exciton relaxation time is shorter than the excitation pulse duration. It is proposed that the energy dependence of exciton relaxation rate can be directly measured from the time decay of a hot luminescence spectrum.
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