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O: Fachverband Oberflächenphysik

O 77: Electronic Structure and Spin-Orbit Interaction III

O 77.7: Vortrag

Donnerstag, 14. März 2013, 17:30–17:45, H33

Development of a Megahertz high-harmonic light source for time-of-flight photoemission spectroscopy — •Cheng-Tien Chiang^1,2, Michael Huth¹, Alexander Blättermann², Jürgen Kirschner^1,2, and Wolf Widdra^2,1 — 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 developed a tunable laboratory light source for time-of-flight photoemission spectroscopy using high-order harmonic generation at 4 MHz. The harmonics are driven by a commercial Ti-sapphire laser oscillator and generated in a tight-focusing geometry. Photons with energies beyond 20 eV are produced from an argon gas jet, and the intensity of harmonics can be significantly increased by using a xenon jet. With this light source, we demonstrate photoemission experiments at 4 MHz repetition rate on the well-known Cu(111) surface with a characteristic electronic structure [1].

[1] C.-T. Chiang, A. Blättermann, M. Huth, J. Kirschner, and W. Widdra, Appl. Phys. Lett. 101, 071116 (2012)