Abstract
Structural change of $\mathrm{GaP}(\overline{1}\overline{1}\overline{1})$ surfaces induced by irradiation with laser pulses in the photon energy region between the indirect and direct band gaps has been investigated. A dip was found near the indirect band-gap energy in the relation between the photon energy and the threshold laser fluence above which the change from the (17\ifmmode\times\else\texttimes\fi{}17) reconstructed structure to the (1\ifmmode\times\else\texttimes\fi{}1) structure occurs. It is concluded that the structural change induced by laser pulses near the indirect band-gap photon energy is due to surface electronic excitation.
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