Abstract
The electronic properties of Cs adsorbed on W(100) and Mo(100) are studied by ELS and UPS.For W(100), the main loss observed in ELS has a constant value of 1.5 eV for coverage θ between 0.6 and 1 monolayer while a small increase from 1.58 to 1.65 eV is observed for Cs on Mo(100).These results are in opposition to the energy loss increase on Cs adsorbed on Cu(111) which is found equal to n1/2 (n being the surface atom density) and attributed to the excitation of a surface plasmon. An interband transition involving the Cs 6s-6p resonances is postulated for Cs on Mo(100) and W(100).Preliminary UPS results indicate that the tungsten surface state observed at normal emission remains sharp and intense and suffers a 1 eV shift to higher binding energy but disappears on Mo(100).
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