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O: Oberflächenphysik
O 45: Zeitaufgelöste Spektroskopie II
O 45.2: Vortrag
Freitag, 12. März 2004, 11:30–11:45, H39
Electron Dynamics of C6F6/Cu(111) studied by time-resolved photoelectron and resonant Auger-Raman spectroscopy — •Patrick Kirchmann1, Panagiotis Loukakos1, Uwe Bovensiepen1, Martin Wolf1, Vijayalakshmi Sethuraman2, Franz Hennies2, Alexander Föhlisch2 und Wilfried Wurth2 — 1Freie Universität Berlin, Fachbereich Physik, Arnimallee 14, 14195 Berlin — 2Universität Hamburg, Institut für Experimentalphysik, Luruper Chaussee 149, 22761 Hamburg
Ultrafast charge transfer times in molecular resonances at metal substrates can be obtained in the frequency domain by the "atomic-clock" method, i.e. where the ratio between "Raman" type and "Auger" type decay channels of a resonant core hole excitation is evaluated [1]. On the other hand, the temporal evolution of the population of photoinjected electrons into an adsorbate resonance by a femtosecond laser pulse can be probed directly in the time-domain by two-photon-photoemission (2PPE)[2]. To compare these two approaches quantitatively, we performed systematic experiments on C6F6/Cu(111) employing resonant X-ray photoelectron spectroscopy at BESSY II and time-resolved 2PPE using sub 30 fs laser pulses in the laboratory. Respective procedures of data analysis and coverage dependent electron lifetimes will presented.
[1] W. Wurth and D. Menzel, Chem. Phys. 251, 141 (2000).
[2] C. Gahl, K. Ishioka, Q. Zhong, A. Hotzel, and M. Wolf; Faraday Discussion 117, 191 (2000).