Darmstadt 2008 – wissenschaftliches Programm
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K: Fachverband Kurzzeitphysik
K 6: Röntgenlaser & EUV - Quellen und deren Anwendungen
K 6.8: Vortrag
Dienstag, 11. März 2008, 18:15–18:30, 2D
Direct measurement of core-level relaxation dynamics on a surface-adsorbate system — •Guido Saathoff1, Luis Miaja-Avila2, Stefan Mathias3, Jing Yin2, Chan La-o-vorakiat2, Michael Bauer4, Martin Aeschlimann3, Margaret Murnane2, and Henry Kapteyn2 — 1Max-Planck-Institut für Quantenoptik, 85748 Garching, Germany — 2Jila and University of Colorado, Boulder, Colorado, 80309, USA — 3Universität Kaiserslautern, 67663 Kaiserslautern, Germany — 4Universität Kiel, 24118 Kiel, Germany
Electronic coupling in surface/adsorbate systems, which occurs on ultrafast time scales in the low femto- to attosecond regime, is fundamental to the understanding of surface chemistry. However, the dynamics of highly-excited adsorbate states have only been studied indirectly to-date. Recently, we extended the laser-assisted photoelectric effect (LAPE), a powerful tool to study ultrafast electron dynamics, to clean solid surfaces [1,2]. In this work, we present the first direct time-resolved observation of the lifetime of a core-excited state of an atom adsorbed onto a surface. By combining the LAPE with laser-assisted Auger decay on an adsorbate/surface system, we directly measure the lifetime of the 4d−1 core level of Xenon on Pt(111) to be 7 ± 1 fs [3]. This result opens up time domain measurements of highly-excited state dynamics in materials systems where, because of complex interactions, energy-resolved measurements provide incomplete information.
[1] L. Miaja-Avila et al., Phys Rev. Lett. 97, 113604 (2006)
[2] G. Saathoff et al., submitted to Phys. Rev. A
[3] L. Miaja-Avila et al., submitted to Science