Abstract
To elucidate further the electronic changes occurring during the initial stages of intercalation, we have made the first studies of ordered Cs and K overlayers on single crystal graphite using angle-resolved ultraviolet photoelectron spectroscopy (ARUPS). In this Communication, we clearly demonstrate that in the case of a (2 × 2) R0° overlayer of Cs or K, the outer alkali metal s electron is completely transferred to the graphite π ∗-conduction bands. We find no evidence for alkali-like s states at the Fermi level.
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