The structure of dense sulphur layers on Ru(0001) II. The (√7 × √7) R19.1° structure

Sklarek, W.; Schwennicke, C.; Jürgens, D.; Pfnür, H.

doi:10.1016/0039-6028(95)00060-7

Cited by 24 publications

(23 citation statements)

References 25 publications

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“…Thoroughly investigated is the S/Ru͑0001͒ system which displays five commensurate phases. 17,23 However, in contrast to the low-coverage hc structure found for S/Cu͑111͒, the lowcoverage phase is a p(2ϫ2) overlayer, which cannot share the openness of the hc structure. Further examples often referred to in connection to the S/Cu͑111͒ are the S/Pd͑111͒ and S/Ag͑111͒ systems.…”

Section: Fig 7 Photoemission Spectra From Rt S/cu͑111͒mentioning

confidence: 89%

Low-temperature structure of S/Cu(111)

et al. 2001

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We use scanning tunneling microscopy ͑STM͒ and core and valence photoemission as well as low-energy electron diffraction to characterize recently discovered S/Cu͑111͒ surface structures that appear at low coverage below ordering temperatures of around 230 K. At even lower coverage ordered local arrangements are observed near steps and dislocations. Of the laterally extending structures one is open and honeycomb ͑hc͒ like, while three other structures ͑I,II,III͒ are more complicated. It is suggested that the structures can be explained as reordered ͑0001͒ planes of CuS. Surprisingly the open hc structure gives room for the Cu͑111͒ surface state according to photoemission and scanning tunneling spectra. Core level spectra provide support for one of the models proposed for an earlier studied room-temperature structure ͓Cu͑111͒-(ͱ7ϫͱ7)RϮ19.1°-S͔.

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Section: Fig 7 Photoemission Spectra From Rt S/cu͑111͒mentioning

confidence: 89%

Low-temperature structure of S/Cu(111)

et al. 2001

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“…The other significant relaxation in the second layer is the vertical displacement of Ni9 downwards; this atom cannot show a lateral displacement because the threefold rotation axis passes through it. Atom Ni9 bonds to six Ni atoms within the second layer (Ni atoms designated 6,7,8,10,11,12), three Ni atoms above (3,4,5) and three below (16,17,18). The triad Ni6, Ni7 and Ni8 is forced to have strong bonding together as noted above, whereas the triad Ni10, Ni11 and Ni12 each necessarily bonds to ten Ni atoms and two phosphorus atoms; Ni9 cannot therefore attain its full bonding quota through its secondlayer neighbours (nor can it to the first layer where its neighbours Ni3, Ni4 and Ni5 already have strong bonding both to phosphorus atoms and to Ni1) and so it displaces down by bonding more strongly to Ni16, Ni17 and Ni18 in the third layer (e.g.…”

Section: Discussionmentioning

confidence: 99%

“…A variation of this model is now believed to be adopted by the S/Ca(III) system. 32 The breadth possible in surface structural chemistry is perhaps well emphasized by the fact that all p 7 ð p 7 R19.1°structures formed by the P/Ni(111), P/Rh(111), 4 S/Pd(111), 5 S/Cu(111) (M. Saidy and K. A. R. Mitchell, unpublished results), S/Ru(0001) 3 and I/Pt(111) 31 systems show significant differences in model type.…”

Section: Issues For Related Structuresmentioning

confidence: 96%

“…This may be a factor in the Ru(0001) surface accommodating individually chemisorbed sulphur atoms without reconstruction at up to 0.57 ML coverage, 3 whereas Rh(111) only appears to do that for sulphur at up to 0.5 ML prior to the onset of cluster formation. 26 For sulphur chemisorbed on Ni(111), reconstruction has occurred at 0.46 ML, although not at 0.33 ML, 27 but for S/Cu(111) it is possible that the critical coverage for reconstruction has been reached even by 0.33 ML, given some uncertainty about the existence of the p 3 ð p 3 R30°s tructure.…”

Section: Issues For Related Structuresmentioning

confidence: 98%

“…Such structures formed, for example, by sulphur or phosphorus on close-packed transition metal surfaces, may involve simple chemisorption bonding on an unreconstructed metal surface (e.g. S/Ru(0001) 3 ) or may involve a substantial reconstruction (e.g. P/Rh(111), 4 S/Pd(111) 5 ) or even an intermediate situation of part reconstruction and part simple chemisorption bonding (e.g.…”

Section: Introductionmentioning

confidence: 99%

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Tensor LEED analysis for the Ni(111)-(√7 × √7)R19.1°-P surface structure: comparison with other √7 systems

Saidy

Zhou

Mitchell

1999

Surf. Interface Anal.

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A crystallographic analysis is reported using low‐energy electron diffraction (LEED) in the tensor LEED approach for the (√7 × √7)R19.1° structure formed by 3/7 monolayer of phosphorus at the Ni(111) surface. This surface has a novel structure in which each phosphorus atom bonds to seven neighbouring Ni atoms, four in the top layer and three in the second layer, at an average distance close to 2.39 Å. Formally this reconstruction involves three neighbouring Ni atoms in a triangular arrangement per unit mesh of the original unreconstructed surface being replaced by three phosphorus atoms. A discussion is included of the structural relaxations that occur in this surface as the demands of Ni–P bonding are balanced against those for Ni–Ni and P–P contributions. Comparisons are made with the √7 reconstructions observed for related systems, including those for P/Rh(111), S/Pd(111) and S/Cu(111). Copyright © 1999 John Wiley & Sons, Ltd.

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