Abstract
Angle resolved ultraviolet photoemission (ARUPS) and sulphur K-edge near edge X-ray absorption fine structure (NEXAFS) have been used to study the interaction of dimethyl disulphide ((CH 3 S) 2 ) and methyl mercaptan (CH 3 SH) on Cu(111) Both species are adsorbed molecularly at low temperature while on warming to, or exposing at, room temperature, a single common species is found which we identify as methyl mercaptide, CH 3 S-. ARUPS from this species shows only three peaks in the HeI spectra which were ascribe to an increase in the symmetry to C 3v . Assinging the first stron gpeak in the NEXAFS spectrum to a σ CS shape resonance, we find that the polarisation dependence of this peak indicates a tilt in the C-S bond away from the surface normal of approximately 30°. This degree of tilt is apparently insufficient to introduce significant loss of energy degeneracy in the valence orbitals probed by ARUPS.
Published Version
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