SKM 2023 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 67: Poster: Electronic Structure of Surfaces
O 67.9: Poster
Mittwoch, 29. März 2023, 18:00–20:00, P2/EG
Exploring electronic structural properties of Copper(Cu) via Auger Photoelectron Coincidence Spectroscopy — •Swarnshikha Sinha1,2, Danilo Kühn1, and Alexander Föhlisch1,2 — 1Helmholtz-Zentrum Berlin für Materialien und Energie GmbH, Albert-Einstein-Strasse 15, 12489 Berlin, Germany — 2Universtät Potsdam, Institut für Physik und Astronomie
The electronic structure of the 3d transition metals are immensely influenced by many electron effects. Photoemission spectroscopy (PES) and Auger electron spectroscopy (AES) can help to learn about screening processes in core excited states and electron correlations in two-hole final states, respectively.
However, in Cu 3p photoemission and MVV Auger decay, the final state holes are located in the same main shell as the initial vacancy, leading to strong lifetime broadening in the spectra. APECS, can help in reducing lifetime broadening and revealing overlapping spectral features. [1] A comparative study of three different copper surfaces (111,110 and 100) was conducted using APECS, at the COESCA station, UE52 PGM beamline at BESSYII [2].Our results confirm a strong energy sharing between the Photo and Auger electrons [3]and substantial differences in the screening of the final states, leading to different asymmetry of the atomic multiplet peaks in the two-hole spectra of the three Cu surfaces.
[1] H.W. Haak, et al., Phys. Rev. Lett. 41, 1825 (1978) [2] T. Leitner, et al., J. El. Spec. 250, 147075 (2021) [3] E. Jensen, et al., Phys. Rev. Lett. 62, 71 (1989)