Patterson Function from Low-Energy Electron Diffraction Measured Intensities and Structural Discrimination

Details Patterson Function from Low-Energy Electron Diffraction Measured Intensities and Structural Discrimination Patterson Function from Low-Energy Electron Diffraction Measured Intensities and Structural Discrimination

2002-12-16

arxiv.org/abs/cond-mat/0212359v1

Physics

Condensed Matter

Materials Science

5 pages, 4 figures

Scientific paper

10.1103/PhysRevB.67.073402

Surface Patterson Functions have been derived by direct inversion of experimental Low-Energy Electron Diffraction I-V spectra measured at multiple incident angles. The direct inversion is computationally simple and can be used to discriminate between different structural models. 1x1 YSi_2 epitaxial layers grown on Si(111) have been used to illustrate the analysis. We introduce a suitable R-factor for the Patterson Function to make the structural discrimination as objective as possible. From six competing models needed to complete the geometrical search, four could easily be discarded, achieving a very significant and useful reduction in the parameter space to be explored by standard dynamical LEED methods. The amount and quality of data needed for this analysis is discussed.

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