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• W1981036458 abstract "A detailed understanding of the sulfur phases formed by the dissociation of hydrogen sulfide and methyl mercaptan at Cu(110) surfaces has been obtained in a combined STM/X-ray photoelectron spectroscopy study. At low concentrations adsorbed sulfur atoms are mobile at room temperature, forming the ordered c(2×2) structures only when the concentration of sulfur reaches approximately 3.8×1014 cm−2. Surface oxygen inhibits sulfur diffusion and ordered c(2×2) sulfur structures are formed at much lower sulfur concentrations in its presence, the sulfur also influences the oxygen structure inhibiting the formation of large oxygen islands. Sulfur concentration (σs) limits for the c(2×2) (σs<4.4×1014 cm−2), p(5×2) (4.4×1014 cm−2<σs<6.6 ×1014 cm−2) and the p(3×2) (σs=7.1×1014 cm−2) sulfur phases have been established. Models, involving surface buckling, have been suggested for these structures which reconcile the previous LEED, STM and SEXAFS data. The adsorption of methyl mercaptan at 295 K results in mercaptide formation but no ordered structures; a herringbone type structure is, however, observed when methyl mercaptan is adsorbed at 70 K and then warmed to room temperature. On heating to 450 K mercaptide dissociates with the complete desorption of carbon as hydrocarbons, providing an alternative route to high chemisorbed sulfur concentration structures. On the basis of XP spectra of methyl mercaptan and a correlation between the XP data and the STM images, the total photoionisation cross-section of the S 2p orbital reported in the literature has been shown to be in error and a new value (2.10, relative to the C 1s cross-section) derived." @default.
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• W1981036458 date "2000-02-01" @default.
• W1981036458 modified "2023-09-24" @default.
• W1981036458 title "The structure of sulfur adlayers at Cu(110) surfaces: an STM and XPS study" @default.
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• W1981036458 doi "https://doi.org/10.1016/s0039-6028(99)01191-7" @default.
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