Coverage-dependent bond-length changes of chlorine adsorbed on Ag{110} determined by shadow-cone<i>–</i>enhanced desorption

Winograd, Nicholas; Chang, Che Chen

doi:10.1103/physrevlett.62.2568

Cited by 16 publications

(6 citation statements)

References 6 publications

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“…However, the situation has been already less clear for Cl on Ag(111) although the structure has been solved long ago ,,− and Ag − low-index surfaces and also to the (√3×√3) R 30° pattern obtained for 0.33 monolayer (ML) coverage of Cl and I on the Cu(111), − Rh(111), , Pd(111), , and Ag(111) ,,− metal surfaces. …”

Section: Introductionmentioning

confidence: 99%

A Systematic Study of the Structure and Bonding of Halogens on Low-Index Transition Metal Surfaces

2006

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The structure and bonding of halogens on various transition metal low-index surfaces has been studied by means of density functional theory (DFT) calculations using periodic slabs to model the surface. This approach is shown to be capable of reproducing available experimental data of naked and halogen-covered surfaces. Periodic trends are discerned and discussed for several properties, including metal-halogen bond distances and vibrational frequencies, adsorption energies, and bond ionicities, which have been evaluated by a Bader population analysis of the corresponding density. A simple correlation is discerned, relating the bond ionicity to the metal work function, so that higher work function surfaces are associated with more covalent bonding. Periodic trends in bond ionicities and metal-halogen vibrational frequencies are in harmony with corresponding data derived in an electrochemical environment, indicating that the metal-halogen bonding in vacuum share some features with the electrode metal surface-halogen bonding.

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Section: Introductionmentioning

confidence: 99%

A Systematic Study of the Structure and Bonding of Halogens on Low-Index Transition Metal Surfaces

2006

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“…The chlorine atoms sit in the 4-fold hollows in the troughs, directly above second layer atoms. At saturation coverage (0.75 ML) the Cl atoms move along the Ag rows to form an incommensurate structure where they occupy the psuedo 3-fold sites and form a c (2 × 4) overlayer. − We have observed a c (2 × 4) LEED pattern following adsorption of molecular chlorine at room temperature and subsequent annealing to 475 K . This may indicate that the (111) microfacet site is also occupied by the chlorine atoms on the Cu 50 Pd 50 (110) alloy surface.…”

Section: Methodsmentioning

confidence: 86%

Quantitative Analysis of Adsorbate Induced Segregation at Bimetallic Surfaces: Improving the Accuracy of Medium Energy Ion Scattering Results

et al. 2001

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Bimetallic systems respond dynamically to the nature of the gas phase in contact with the surface. The development of a surface analytical tool which probes the layer by layer composition of a bimetallic surface covered by an adsorbate would be of great benefit in understanding complex catalytic and corrosion processes. This paper examines critically the possibility of using medium energy ion scattering to obtain such information. The unique shadowing and blocking capabilities of this technique make it possible, in principle, to selectively illuminate integer numbers of surface layers. As the physics of the incident ion-surface atom collision is well established, it should then be possible to effectively count the number of each atom type present in the first layer, the top two layers, the top three layers, etc., of the bimetallic surface, thereby giving quantitative compositional information. Using a combination of experiment and simulation, we investigate how the number of layers illuminated depends on the extent of the surface layer relaxation, the adsorbate and the surface Debye temperature. We calculate the layer compositions of the top three layers in the Cu 50 Pd 50 (110)/C 2 H 4-x Cl x system. We show that hydrocarbon adsorption produces a measurable Pd enrichment in the surface layer, while Cu enrichment is produced by the presence of Cl(ads) and C(ads).

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“…Our results reveal that, although the ``megaevent'' [24,25] induced by the ion impacts may be important under some speci®c conditions of ion incidence, these events are rare and do not contribute signi®cantly to the total amount of surface damage created by the static keV ion bombardment. It is thus possible to characterize the geometric structure of the surface using the static secondary ion mass spectrometry (SIMS) [47,48]. Results of our studies on the dependence of the average displacement upon the initial atomic distance from the target atom also reveal that the ioninduced structural disturbance is very localized.…”

Section: Discussionmentioning

confidence: 94%

Crystal order near the point of impact under static keV ion bombardment

Chang

1999

Nuclear Instruments and Methods in Physics Research Section B:

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Coverage-dependent bond-length changes of chlorine adsorbed on Ag{110} determined by shadow-cone–enhanced desorption

Cited by 16 publications

References 6 publications

A Systematic Study of the Structure and Bonding of Halogens on Low-Index Transition Metal Surfaces

A Systematic Study of the Structure and Bonding of Halogens on Low-Index Transition Metal Surfaces

Quantitative Analysis of Adsorbate Induced Segregation at Bimetallic Surfaces: Improving the Accuracy of Medium Energy Ion Scattering Results

Crystal order near the point of impact under static keV ion bombardment

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