Dresden 2014 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 16: Electronic Structure and Spin-Orbit Interaction II
O 16.8: Vortrag
Montag, 31. März 2014, 17:45–18:00, GER 38
Efficient photoemission spectroscopy via a MHz high-harmonic light source — •Andreas Trützschler1,2, Michael Huth1, Cheng-Tien Chiang1,2, Jürgen Kirschner1,2, and Wolf Widdra2,1 — 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 demonstrate an efficient photoemission setup by combining time-of-flight (ToF) spectroscopy with a laboratory MHz pulsed light source with photon energies from 16 to 40 eV. The light is provided by high-order harmonic generation driven by a compact fiber laser system. The high flux of 109 photons per second (at 25 eV) at the sample position together with the efficient collection of photoelectrons using ToF spectroscopy allows rapid band mapping of the electronic band structure. As an example we demonstrate photoemission experiments on Ag(100), which reveal the valence band electronic structure within 10 seconds measurement time without remarkable space-charge effects.