The interaction of methanethiol, CH3 SH, with Cu(100) was studied by S 1s photoemission, S K-edge near-edge X-ray absorption fine structure and normal-incidence standing X-ray wavefield absorption at both (200) and (111) reflections. The results indicate that a single methanethiolate species, CH3S-, was formed and this was bonded to the unreconstructed surface via the S atoms which adopt the fourfold symmetric hollow site. This conclusion confirms the results of a near-edge and surface extended X-ray absorption fine structure study, but contrasts with the established adsorbate-induced reconstruction produced by this species on Cu(111).

A Structural Study of Methanethiolate Adsorbed on Cu(100). M.S.Kariapper, C.Fisher, D.P.Woodruff, B.C.C.Cowie, R.G.Jones: Journal of Physics - Condensed Matter, 2000, 12[10], 2153-61