Investigation of adsorbates with low energy electron diffraction at very low energies (VLEED)

H. Pfnür, M. Lindroos, D. Menzel

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Abstract

A systematic test of the properties of LEED in the energy range below 40 eV and its geometrical sensitivity for the case of light adsorbates was carried out using the p(2 × 2) and p(2 × 1) ordered phases of oxygen on Ru(001) as test systems. After modelling the surface barrier by a two-step function calculated IV-curves of the (00)-beam fit the experimental data reasonably well with the optimal geometries obtained by full LEED IV analyses previously. The site sensitivity to light adsorbates like O was found comparable to conventional LEED, although only an integral-order beam was used for the analysis. Multiple scattering contributions for inter- and intra-layer scattering between adsorbate and substrate and within the adsorbed layer were found to be small above 8 eV and incidence angles up to 45° so that VLEED can also be used to analyze disordered lattice gases.

Original languageEnglish
Pages (from-to)1-10
Number of pages10
JournalSurface Science
Volume248
Issue number1-2
DOIs
StatePublished - 3 May 1991

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