Berlin 2015 – wissenschaftliches Programm

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O: Fachverband Oberflächenphysik

O 66: Electronic Structure of Surfaces

O 66.8: Poster

Mittwoch, 18. März 2015, 18:15–21:00, Poster A

Core-resonant double photoemission from palladium films — •Ilya Kostanovskiy, Frank Schumann, Zheng Wei, Yuri Aliaev, and Jürgen Kirschner — Max Planck Institute of Microstructure Physics, Halle, Germany

We present a core-resonant double photoemission study from palladium films with synchrotron radiation. In an MVV Auger process a 3d (M) core level electron is excited and the subsequent decay involves two 4d (V) valence electrons. This process provides access to the electron-electron interactions in the valence band. We measured Pd 3d photoelectrons in coincidence with the Auger MVV electrons by means of linear polarized light. We selected two polarization directions perpendicular to each other. In contrast to single electron photoemission we observe a polarization dependence not only for the photo electrons, but also for the Auger line. This effect can be quantitatively explained within a simple model.

Additionally, we present the sum energy spectra which display a simple triangular-like line shape. It resembles a self convolution of a constant density of states. Our results will be compared with theoretical descriptions of the Auger decay. These either implement an electron-electron interaction within the valence band or use atomic multiplet theory.