Berlin 2018 – wissenschaftliches Programm

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O: Fachverband Oberflächenphysik

O 41: Poster: Metal Substrates - Structure, Epitaxy, Growth and Adsorption

O 41.3: Poster

Dienstag, 13. März 2018, 18:15–20:30, Poster A

IV-LEED investigations of Ag(001): experimental effects and data analysis — •Jascha Bahlmann, Frederic Timmer, and Joachim Wollschläger — Fachbereich Physik, Universität Osnabrück, Barbarastraße 7, 49076 Osnabrück, Germany

IV-LEED is a powerful technique for surface sensitive structure analysis since the electrons of the used energy range provide information of only the few topmost surface layers. For a successful IV-LEED analysis, it is crucial to know the influences of the experimental setup like the angle of incidence of the electron beam or the temperature of the sample as well as the subtleties in data evaluation.

These effects were investigated systematically for the well known Ag(001) surface. Especially, we examined their influence on IV-curves recorded in the energy range 50-700 eV and studied the effect on the Pendry R-factor and the resulting geometrical structures determined by IV-LEED analysis. Low temperatures and a well known angle of incidence are essential for reliable results. Additionally the Debye-Waller factor and the root mean square of the thermal displacement of atoms were determined. Furthermore the influence of different filters for the smoothing of experimental spectra was evaluated.