Abstract
Evolution of the surface concentration of cesium adsorbed on HOPG turbostratic graphite samples have been studied after various heat treatments. After heating at 750 K of the first deposit, the cesium then deposited at room temperature, quickly dissolves in the bulk. When deposited at 200 K, a new cesium layer is stable. The ratio of cesium Auger transitions (47 eV and 563 eV) varies appreciably (from 1 to 4) in accordance with the quantity adsorbed and the successive heat treatments of the sample. The formation of graphite lamellar compounds of cesium produces a new transition at 280 eV on the graphite KVV Auger peak. Metallographic microscope pictures of the sample after deposition and dissolution of several monolayers of cesium exhibit a preferential diffussion along grain boundaries of the sbustrate.
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