Dresden 2009 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 65: Time-resolved spectroscopies III
O 65.4: Vortrag
Freitag, 27. März 2009, 12:00–12:15, SCH A315
Direct measurement of core-level relaxation dynamics on a surface-adsorbate system — •Stefan Mathias1, Luis Miaja-Avila2, Guido Saathoff3, Jing Yin2, Chan La-o-vorakiat2, Michael Bauer4, Martin Aeschlimann1, Margaret Murnane2, and Henry Kapteyn2 — 1University of Kaiserslautern, 67663 Kaiserslautern, Germany — 2JILA and University of Colorado, Boulder, Colorado, 80309, USA — 3Max-Planck-Institute of Quantum Optics, 85748 Garching, Germany — 4Universität Kiel, 24908 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. 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 using high-harmonic generation (HHG) EUV light pulses. By combining the laser-assisted photoelectric effect (LAPE) on surfaces [1,2] 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., Phys. Rev. A 77, 022903 (2008)
[3] L. Miaja-Avila et al., Phys. Rev. Lett. 101, 046101 (2008)