Abstract
Two-photon photoelectron spectra of GaP have been measured using 3-ps laser pulses of a photon energy below the valence-band photoelectron threshold. Clean, 1\ifmmode\times\else\texttimes\fi{}1 ordered GaP(110) surfaces and surfaces disordered by ${\mathrm{Ar}}^{+}$ sputtering are compared. Delayed excitation/probe measurements set an upper limit of 3 ps on the relaxation time of transiently populated states. Changes in the photoemission spectra have been observed following pulsed-laser irradiation of surfaces with photon energies less than the band gap, and fluences below the threshold of single-shot damage. The changes in the spectrum are discussed with reference to previous studies of laser-induced desorption and damage on GaP.
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