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Degenerate pump and probe measurements on bulk GaAs <100> surfaces with sub-100 fs near infrared laser pulses have been performed in the 0.8 − 3 × 1017 carriers cm-3 excitation range at room temperature. Transient reflectivity data reveal the progressive extinction of the LO-phonon emission channel when the excess excitation energy is decreased. At these wavelengths and for low excitation levels, acoustic phonon absorption from conduction band minimum is observed. Surface recombination rates are deduced from the picosecond evolution of the reflectivity.
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