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Proceedings Paper

Electron localization and solvation in two dimensions
Author(s): Charles B. Harris; Paul Szymanski; Sean Garrett-Roe; Andre D. Miller; Kelly J. Gaffney; Simon H. Liu; Ilya Bezel
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Paper Abstract

Two-photon photoemission of thiolate/Ag(111), nitrile/Ag(111), and alcohol/Ag(111) interfaces elucidates electron solvation and localization in two dimensions. For low coverages of thiolates on Ag(111), the occupied (HOMO) and unoccupied (LUMO) electronic states of the sulfer-silver bond are localized due to the lattice gas structure of the adsorbate. As the coverage saturates and the adsorbate-adsorbate nearest neighbor distance decreases, the HOMO and LUMO delocalize across many adsorbate molecules. Alcohol- and nitrile-covered Ag(111) surfaces solvate excess image potential state (IPS) electrons. In the case of alcohol-covered surfaces, this solvation is due to a shift in the local workfunction of the surface. For two-monolayer coverages of nitriles/Ag(111), localization accompanies solvation of the IPS. The size of the localized electron can be estimated by Fourier transformation of the wavefunction from momentum- to position-space. The IPS electron localizes to 15 ± 4 angstroms full-width at half maximum in the plane of the surface, i.e., to a single lattice site.

Paper Details

Date Published: 4 December 2003
PDF: 10 pages
Proc. SPIE 5223, Physical Chemistry of Interfaces and Nanomaterials II, (4 December 2003); doi: 10.1117/12.504849
Show Author Affiliations
Charles B. Harris, Univ. of California/Berkeley (United States)
Lawrence Berkeley National Lab. (United States)
Paul Szymanski, Univ. of California/Berkeley (United States)
Lawrence Berkeley National Lab. (United States)
Sean Garrett-Roe, Univ. of California/Berkeley (United States)
Lawrence Berkeley National Lab. (United States)
Andre D. Miller, Intel Corp. (United States)
Kelly J. Gaffney, Stanford Linear Accelerator Ctr. (United States)
Simon H. Liu, The Aerospace Corp. (United States)
Ilya Bezel, Los Alamos National Lab. (United States)


Published in SPIE Proceedings Vol. 5223:
Physical Chemistry of Interfaces and Nanomaterials II
Tianquan Lian; Hai-Lung Dai, Editor(s)

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