dorsal/arxiv
View SchemaHe Scattering from Random Adsorbates, Disordered Compact Islands and Fractal Submonolayers: Intensity Manifestations of Surface Disorder
| Authors | A. T. Yinnon, D. A. Hamburger, I. Farbman, R. B. Gerber, P. Zeppenfeld, M. A. Krzyzowski, G. Comsa |
|---|---|
| Categories | |
| ArXiv ID | physics/9701021 |
| URL | https://arxiv.org/abs/physics/9701021 |
| DOI | 10.1063/1.473513 |
Abstract
A theoretical study is made on He scattering from three fundamental classes of disordered ad-layers: (a) Translationally random adsorbates, (b) disordered compact islands and (c) fractal submonolayers. The implications of the results to experimental studies of He scattering from disordered surfaces are discussed, and a combined experimental-theoretical study is made for Ag submonolayers on Pt(111). Some of the main theoretical findings are: (1) Structural aspects of the calculated intensities from translationally random clusters were found to be strongly correlated with those of individual clusters. (2) Low intensity Bragg interference peaks appear even for scattering from very small ad-islands, and contain information on the ad-island local electron structure. (3) For fractal islands, just as for islands with a different structure, the off-specular intensity depends on the parameters of the He/Ag interaction, and does not follow a universal power law as previously proposed in the literature. In the experimental-theoretical study of Ag on Pt(111), we use first experimental He scattering data from low-coverage (single adsorbate) systems to determine an empirical He/Ag-Pt potential of good quality. Then, we carry out He scattering calculations for high coverage and compare with experiments. The conclusions are that the actual experimental phase corresponds to small compact Ag clusters of narrow size distribution, translationally disordered on the surface.
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"abstract": "A theoretical study is made on He scattering from three fundamental classes\nof disordered ad-layers: (a) Translationally random adsorbates, (b) disordered\ncompact islands and (c) fractal submonolayers. The implications of the results\nto experimental studies of He scattering from disordered surfaces are\ndiscussed, and a combined experimental-theoretical study is made for Ag\nsubmonolayers on Pt(111). Some of the main theoretical findings are: (1)\nStructural aspects of the calculated intensities from translationally random\nclusters were found to be strongly correlated with those of individual\nclusters. (2) Low intensity Bragg interference peaks appear even for scattering\nfrom very small ad-islands, and contain information on the ad-island local\nelectron structure. (3) For fractal islands, just as for islands with a\ndifferent structure, the off-specular intensity depends on the parameters of\nthe He/Ag interaction, and does not follow a universal power law as previously\nproposed in the literature. In the experimental-theoretical study of Ag on\nPt(111), we use first experimental He scattering data from low-coverage (single\nadsorbate) systems to determine an empirical He/Ag-Pt potential of good\nquality. Then, we carry out He scattering calculations for high coverage and\ncompare with experiments. The conclusions are that the actual experimental\nphase corresponds to small compact Ag clusters of narrow size distribution,\ntranslationally disordered on the surface.",
"arxiv_id": "physics/9701021",
"authors": [
"A. T. Yinnon",
"D. A. Hamburger",
"I. Farbman",
"R. B. Gerber",
"P. Zeppenfeld",
"M. A. Krzyzowski",
"G. Comsa"
],
"categories": [
"physics.chem-ph"
],
"doi": "10.1063/1.473513",
"title": "He Scattering from Random Adsorbates, Disordered Compact Islands and Fractal Submonolayers: Intensity Manifestations of Surface Disorder",
"url": "https://arxiv.org/abs/physics/9701021"
},
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