Berlin 2008 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 43: Poster Session II - MA 141/144 (Surface Spectroscopy on Kondo Systems; Frontiers of Surface Sensitive Electron Microscopy; Methods: Scanning Probe Techniques+Electronic Structure Theory+Other; Time-Resolved Spectroscopy of Surface Dynamics with EUV and XUV Radiation; joined by SYNF posters)
O 43.45: Poster
Dienstag, 26. Februar 2008, 18:30–19:30, Poster F
Spectral Line Shape Variations in Time-Resolved Photoemission from a Solid — E.E. Krasovskii1,2, •Karsten Balzer2, Sebastian Bauch2, and Michael Bonitz2 — 1Insititute of Metal Physics, National Academy of Science of Ukraine, 03142 Kiev, Ukraine — 2Institut für Theoretische Physik und Astrophysik, Christian-Albrechts-Universität Kiel, Leibnizstrasse 15, 24098 Kiel, Germany
Time resolved photoemission with (sub)femtosecond UV pulses is of hight current interest [1] and is, here, studied by solving the time-dependent Schrödinger equation for a one-dimensional model crystal [2]. Without the laser field the shape and the energy location of the spectrum is determined by the energy dependence of photoemission cross section. In the presence of the laser field, the time growth of the population of the final state is predicted to cause extremely sharp variations of spectral width as a function of release time. This can help enhance resolution of the measurements. A simple phenomenological model to describe the line shape is proposed and shown to accurately reproduce the numerical results.
[1] M. Hentschel et al., Nature 414, 509 (2001).
[2] E.E. Krasovskii, and M. Bonitz, accepted for publication in Phys. Rev. Lett. (2007).