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The InAs(111)2~2 and ~n~s (i i i) l x l surfaces have been studied with high resolution core level spectroscopy. For the ~n~s (i i i) l x l surface both the In 4d and the As 3d core levels display strong surface core level shifts, while for the InAs(l11)2x2 surface only the In 4d level shows a detectable surface shift. The results indicate that the ~n A s (i i i) l x l 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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