Dresden 2014 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 16: Electronic Structure and Spin-Orbit Interaction II
O 16.9: Vortrag
Montag, 31. März 2014, 18:00–18:15, GER 38
Electron pair emission detected by time-of-flight spectrometers: new perspectives — •Michael Huth1, Cheng-Tien Chiang1,2, Andreas Trützschler1,2, Wolf Widdra2,1, Frank O. Schumann1, and Jürgen Kirschner1,2 — 1Max-Planck-Institut für Mikrostrukturphysik, Weinberg 2, D-06120, Halle(Saale), Germany — 2Institute of Physics, Martin-Luther-Universität Halle-Wittenberg, Von-Danckelmann-Platz 3, D-06120, Halle(Saale), Germany
We present results for electron coincidence spectroscopy obtained by using two time-of-flight (ToF) spectrometers. Electron-pair emission from a Cu(111) surface detected in coincidence and excited by electron impact allows to resolve the dispersion of the Shockley surface state in the momentum distribution. By combining the two ToF spectrometers with a high-order harmonic generation light source opens up new perspectives to enable (γ,2e) spectroscopy in the laboratory that required synchrotron radiation in the past. Utilizing this setup we report results for (γ,2e) on NiO(001) on Ag(001) excited with light at 30 eV photon energy.