Abstract

Angle-resolved photoemission with synchrotron radiation has been applied to the study of adsorbed films of cytosine on Cu(110). Using dipole selection rules, we established that in the monolayer the molecules adsorb with the molecular plane perpendicular to the surface while in multilayer films only a preferred, but indeterminate, orientation was ascertainable. The oxygen lone-pair orbital was found to be strongly affected by the adsorption in the monolayer.

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