Abstract
Evolution of surface structures during conversion from various As-stabilized surfaces to Ga-stabilized ones is observed by surface photo-absorption. Desorption of As dimers parallel to [110] is observed during the structural change of c(4 × 4) and (2 × 4) γ. The evolution of Ga- and As-related peaks is isolated in surface dielectric anisotropy spectra, which are determined using p- and s-polarized surface photo-absorption spectra during the conversion of (2 × 4) β to a Ga-stabilized (4 × 2) surface.
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