Dresden 2011 – scientific programme

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O: Fachverband Oberflächenphysik

O 90: Electronic structure III

O 90.9: Talk

Thursday, March 17, 2011, 19:15–19:30, WIL C107

Double photoemission illuminates the Auger process — •Zheng Wei, Grant van Riessen, Rajendra S. Dhaka, Carsten Winkler, Frank O. Schumann, and Jürgen Kirschner — Max-Planck-Institut für Mikrostrukturphysik, 06120 Halle, Germany

We performed a double photoemission (DPE) experiment on a Cu(001) surface at the BESSY-II storage ring. The energy of the linearly polarized photons was tuned to 125 eV. We are able to map out the photoelectron and Auger electron simultaneously in large energy space of 30 eV×30 eV [1]. Electron pairs emitted directly from the valence band are known to share continuously the available energy due to the fact that this process proceeds in a single-step [2]. Usually the emergence of an Auger electron is explained via a two-step process in which the relaxation leading to the Auger emission is preceded by the emission of a photo-electron. Our observation of a continuous energy sharing in the DPE intensity involving core electrons can only be explained within a single-step process.