Abstract
On the basis of neutralization of low-energy D + ions, the nature of bonding of potassium on Pt(111), Si(100) and Si(111) surfaces has been studied in a low-coverage region (< 0.2 ML). It is concluded that the K adatoms on the Si(100) surface are highly ionic while those on the Pt(111) surface are characterized by covalent or metallic bonding. The ionic nature of potassium can be ascribed to the existence of the empty dangling-bond states and/or the bulk band gap of the Si(100) substrate.
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