The dynamics of intervalley scattering of electrons is investigated in GaAs with 6 fs optical pulses at room temperature. We report the observation of a ``resonant coupling'' between the {Γ} and X conduction bands. This effect slows the apparent rate of scattering of carriers in the {Γ} valley at energies near the minimum of the X valley.
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Bigot et al. (1990) studied this question.
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