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Electronic structure of methanethiolate self-assembled on the Cu(1 0 0) surface
Ist Teil von
Surface science, 2004-09, Vol.566, p.591-596
Ort / Verlag
Elsevier B.V
Erscheinungsjahr
2004
Link zum Volltext
Quelle
Elsevier ScienceDirect Journals
Beschreibungen/Notizen
We present a high-resolution UV photoelectron spectroscopy investigation of methanethiolate (CH
3S–) adsorbed on the clean Cu(1
0
0) surface, by vapour-phase deposition of dimethyl disulphide [(CH
3S)
2, DMDS] in controlled ultra-high-vacuum conditions (UHV). The low-energy electron-diffraction (LEED) pattern reveals the formation of a first p(2
×
2) low-density phase up to 2.7 Langmuir (L) exposure, followed by a two-domain c(2
×
6) high-density phase, at room temperature. We identify the valence band peaks specific of the corresponding structural phases due to S–Cu bond formation, and in particular a different spectral density of electronic states for the two long-range ordered phases is brought to light. Keeping the substrate at low-temperature, a physisorbed multilayer phase of un-dissociated DMDS molecules grows-up on top of the first chemisorbed monolayer, with a clear long-range ordered c(2
×
2) structure.