Abstract
Abstract The modification of LEED patterns of GaP(111) surfaces induced by irradiation with laser pulses of indirect-band-gap energy has been examined. It is shown that the (17×17) reconstructed structure of the clean GaP(111) surface transforms to the (1×1) structure upon irradiation with a laser pulse having a fluence that does not give appreciable temperature rise. Irradiation with a laser pulse of higher fluence is found to destroy the crystalline structure of the surface layers; the threshold fluence is found to approach that of transformation to the (1×1) structure when the specimens are bombarded with multiple laser pulses.
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