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 language | English |
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Pages (from-to) | 1-10 |
Number of pages | 10 |
Journal | Surface Science |
Volume | 248 |
Issue number | 1-2 |
DOIs | |
State | Published - 3 May 1991 |