Abstract
The InAs(111)2 × 2 and InAs(111) 1 × 1 surfaces have been studied with high resolution core level spectroscopy. For the InAs(111)1 × 1 surface both the In 4d and the As 3d core levels display strong surface core level shifts, while for the InAs(111)2 × 2 surface only the In 4d level shows a detectable surface shift. The results indicate that the InAs(111) 1 × 1 surface is relaxed, with atom layer displacement extending to subsurface layers. Unexpectedly, we find no surface shifted anion core level for the InAs(111) 2 × 2 surface
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