Abstract

K, Rb and Cs graphite intercalation compounds have been studied by photoelectron spectroscopy both in U.P.S. and in X.P.S. The study in high vacuo purity conditions and on well characterized samples ensures the experimental results to be relative to clean and not deteriorated surfaces. This certainty has been verified by comparison with spectra obtained on the same surfaces after a well-controlled oxidization. Core and valence spectra of carbon and alkaline species obtained at three different energies (1253.6, 21.2 and 40.8 eV) at room and at low temperature are analyzed in terms of stoichiometry and surface cleanness. Observing the surface of the first stage Cs-, Rb- and K- graphite intercalation compounds, the XC 8 composition has been obtained provided the bulk is stoichiometric and the ultra-high vacuo of good quality. Criteria for surface cleanness are described and the work functions given.

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