SKM 2023 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 92: Oxide and Insulator Surfaces II: Structure, Epitaxy and Growth
O 92.5: Vortrag
Freitag, 31. März 2023, 11:30–11:45, CHE 91
LEED I(V) with ViPErLEED: Overview and Applications — •Alexander M. Imre1, Florian Kraushofer1,2, Florian Doerr1, Tilman Kißlinger3, Michael Schmid1, Ulrike Diebold1, Lutz Hammer3, and Michele Riva1 — 1TU Wien, Vienna, Austria — 2TU Munich, Munich, Germany — 3FAU Erlangen-Nürnberg, Erlangen, Germany
LEED I(V) is an extension to qualitative Low Energy Electron Diffraction (LEED) pattern analysis in which diffraction intensities are quantitatively studied as a function of incident electron energy. This yields structural information about the surface that can be difficult to obtain otherwise. Regrettably, LEED I(V) has been underutilized by the surface science community over the last decades.
Our group has developed the Vienna Package for TensErLEED (ViPErLEED); a suite of hardware and software aiming to drastically reduce the barrier of entry for the technique. The three core parts of ViPErLEED are: (1) electronics that enable upgrading existing LEED setups for LEED I(V), (2) a spot tracker for easy I(V) curve extraction, and (3) a Python package for LEED I(V) analysis based on the TensErLEED package.
We present a quick overview of ViPErLEED and give insight into current developments. We then show LEED I(V) results obtained and analyzed using ViPErLEED for the α-Fe2O3(012)-(1×1) and (2×1) surfaces. While a bulk-truncation is confirmed for α-Fe2O3(012)-(1×1), current structural models cannot explain the (2×1) termination.