Abstract
The orientation of pyridine adsorbed on Rh(111) at room temperature has been investigated as a function of surface coverage using angle resolved UV photoelectron spectroscopy (ARUPS), thermal desorption spectroscopy (TDS) and work function measurements. The ARUPS data exhibit significant differences in spectral behaviour at low and at high pyridine surface coverages, which are interpreted in terms of a transition from flat lying molecules at low coverage to inclined molecules at high coverage. The TDS results, which show some molecular pyridine desorption at T> room temperature, in conjunction with ARUPS spectra recorded as a function of temperature suggest the presence of intact pyridine molecules in the room temperature dosed adlayer.
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