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Berlin 2012 – scientific programme

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O: Fachverband Oberflächenphysik

O 43: Clean surfaces III

O 43.10: Talk

Wednesday, March 28, 2012, 12:45–13:00, MA 043

Dichroism in double photoemission from a Cu surfaceZheng Wei1, •Frank O. Schumann1, Gianluca Difilippo2, Giovanni Stefani2, and Jürgen Kirschner11Max-Planck-Institut für Mikrostrukturphysik, 06120 Halle, Germany — 2Dipartimento di Fisica, Università Roma Tre, Rome, Italy

We performed a double photoemission (DPE) experiment with circular polarized light on a Cu(001) surface. The photon energy was chosen to be 125 eV leading to comparable kinetic energies of the 3p photo electron and related Auger electron. We find that the coincidence spectra display circular dichroism while the singles spectra are helicity independent. 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 photoelectron. This is at odds with a continuous energy sharing [1] and the observation of dichroism in the coincidence spectra only. Our observation can only be explained within a single-step process.

[1] G. van Riessen, Z. Wei, R. S. Dhaka, C. Winkler, F. O. Schumann and J. Kirschner, J. Phys.:Condens. Matter 22, 092201 (2010).
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