Abstract
On increasing K coverages, the valence levels of π-bonded ethylene formed on K precovered Pt(111) surfaces are seen to shift continuously towards higher binding energies up to θK = 0.14 and to level off beyond that coverage. This behaviour is explained using simple electrostatic considerations. At low coverage, the compression of the molecules is suggested to move the π-bonded molecules towards the K atoms (i.e. towards higher local electrostatic potential). Above θk = 0.14, the predominant effect comes from the influence of several K adatoms.
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