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Spectroscopic determination of the optical deformation-potential constant in semiconductors.

The optical deformation-potential constant, atherwise inaccessible in undaped materials, is measured in CdSe by optical spectroscopy with subpicosecond time resolution. The phonon-assisted transitions from B to A excitons occur with a decay time of 0.9 ps, determined by pump-and-probe experiments. An analytic expression for the transition time is obtained. Since the Frohlich interaction is symmetry forbidden, we use a nonpolar optical Hamiltonian and extract a deformation-potential constant of d 0 =32 eV