Reciprocal Space Mapping by spot profile analyzing low energy electron diffraction

In: Review of Scientific Instruments, Jg. 76 (2005) ; Nr. 8, S. 85102
ISSN: 1089-7623, 0034-6748
Zeitschriftenaufsatz / Fach: Physik
Fakultät für Physik » Experimentalphysik
Abstract:
We present an experimental approach for the recording of two-dimensional reciprocal space maps using spot profile analyzing low energy electron diffraction (SPA-LEED). A specialized alignment procedure eliminates the shifting of LEED patterns on the screen which is commonly observed upon variation of the electron energy. After the alignment, a set of one-dimensional sections through the diffraction pattern is recorded at different energies. A freely available software tool is used to assemble the sections into a reciprocal space map. The necessary modifications of the Burr-Brown computer interface of the two Leybold and Omicron type SPA-LEED instruments are discussed and step-by-step instructions are given to adapt the SPA 4.1d software to the changed hardware. Au induced faceting of 4° vicinal Si(001) is used as an example to demonstrate the technique.

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