Step interaction and relaxation at steps: Pt(110)

Swamy, K.; Bertel, E.; Vilfan, I.

doi:10.1016/s0039-6028(99)00250-2

Cited by 33 publications

(20 citation statements)

References 36 publications

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“…Atomically-resolved images of the ͑2ϫ1͒-p2mg-2CO structure created on the flat terraces allow us to confidently conclude that the pressure gap has indeed been bridged for this system. Contrary to the findings of McIntyre et al we do, however, not observe any large-scale changes, i.e., the wellknown mesoscopic ''corrugated-iron'' structure 47,48 is not modified even after overnight exposure to 1 bar CO at 373 K. The level of gas cleanliness may be the point where the study of McIntyre et al differs from the present study and could explain the discrepancies.…”

Section: B High-coverage Behaviorcontrasting

confidence: 99%

CO-induced restructuring of Pt(110)-(1×2): Bridging the pressure gap with high-pressure scanning tunneling microscopy

Thostrup

Vestergaard

et al. 2003

The Journal of Chemical Physics

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We present an extensive investigation of CO-induced structural transformations occurring on the reconstructed Pt(110)-(1×2) surface while bridging the so-called pressure gap between surface science and industrial catalysis. The structural changes are followed on the atomic scale as a function of CO pressure over 12 orders of magnitude, up to 1 bar, by the use of a novel high-pressure scanning tunneling microscope (HP-STM). The transition between the low-coverage and saturation-coverage structures is found to proceed through local displacements of substrate Pt atoms. The structural transformations of the Pt surface as observed by STM can be explained within a very simple picture governed by the gain in CO binding energy when CO binds to low-coordinated metal atoms.

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Section: B High-coverage Behaviorcontrasting

confidence: 99%

CO-induced restructuring of Pt(110)-(1×2): Bridging the pressure gap with high-pressure scanning tunneling microscopy

Thostrup

Vestergaard

et al. 2003

The Journal of Chemical Physics

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“…While the DFT analysis describes a perfectly ordered (1ϫ2) reconstructed surface of infinite extension, the real sample exhibits a vast number of steps as known through STM. 36,38 Below a step edge the buckled third layer has to match the unbuckled second and fourth layer of the neighboring terraces. Additionally, step relaxations as known from other stepped surfaces 69 will be superimposed and the overall structural matching may reduce the average buckling amplitude.…”

Section: Comparison and Discussion Of Structural Resultsmentioning

confidence: 99%

“…This broadening is due to small terrace widths of only about 15 Å on average for this direction due to the mesoscopic ''corrugated-iron'' structure found for this surface. 36,38 Bromine molecules were dosed at TϷ130 K by means of a solid-state electrolysis cell. Annealing of the sample at 780 K leads to partial bromine desorption leaving 0.5 ML of dissociated Br on the surface ͑for details of the preparation see Ref.…”

Section: Experimental and Computational Detailsmentioning

confidence: 99%

Structure of thec(2×2)-Br/Pt(110) surface

et al. 2002

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We present a detailed investigation of the c(2ϫ2)-Br/Pt(110) adlayer structure supplemented by the analysis of the (1ϫ2) missing-row ͑MR͒ structure of the clean Pt͑110͒ surface. Quantitative low energy electron diffraction analyses and first-principles calculations are in impressive agreement in both cases. The clean surface reconstruction is determined with unprecedented accuracy. For the adsorbate, the analysis retrieves a simple Br-adlayer structure with the Br atoms residing in every second short bridge position on the closepacked Pt rows with the MR reconstruction lifted. The Br-Pt bond length Lϭ2.47 Å is almost equal to the sum of the atomic radii. The substrate below the adsorbate exhibits a contraction of the first layer spacing which amounts to half of that calculated for an unreconstructed clean surface.

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“…‡ Before the recognition of the utility of the Wigner distribution, one could not deal quantitatively with smallÃ [35].…”

Section: Preliminary Numerical Resultsmentioning

confidence: 99%

Terrace-width distributions and step–step repulsions on vicinal surfaces: symmetries, scaling, simplifications, subtleties, and Schrödinger

et al. 2001

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For more than three decades, measurement of terrace width distributions (TWDs) of vicinal crystal surfaces have been recognized as arguably the best way to determine the dimensionless strength A of the elastic repulsion between steps. For sufficiently strong repulsions, the TWD is expected to be Gaussian, withÃ varying inversely with the squared variance. However, there has been a controversy over the proportionality constant. From another perspective the TWD can be described as a continuous generalized Wigner distribution (CGWD) essentially no more complicated than a Gaussian but a much better approximation at the few calibration points where exact solutions exist. This paper combines concisely the experimentally most useful results from several earlier papers on this subject and describes some advancements that are in progress regarding numerical tests and in using Schrödinger-equation formalism to give greater understanding of the origin of the CGWD and to give hope of extensions to more general interaction potentials between steps. There are many implications for future experiments.

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Step interaction and relaxation at steps: Pt(110)

Cited by 33 publications

References 36 publications

CO-induced restructuring of Pt(110)-(1×2): Bridging the pressure gap with high-pressure scanning tunneling microscopy

CO-induced restructuring of Pt(110)-(1×2): Bridging the pressure gap with high-pressure scanning tunneling microscopy

Structure of thec(2×2)-Br/Pt(110) surface

Terrace-width distributions and step–step repulsions on vicinal surfaces: symmetries, scaling, simplifications, subtleties, and Schrödinger

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