Dresden 2006 – wissenschaftliches Programm

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O: Oberflächenphysik

O 26: Particles and clusters I

O 26.5: Vortrag

Dienstag, 28. März 2006, 16:45–17:00, WIL A317

Dynamic final state effect for the photoemission of gold clusters on graphite: comparison with scanning-tunneling spectroscopy — •Heinz Hövel and Ingo Barke — Universität Dortmund, Experimentelle Physik I, 44221 Dortmund, Germany

We present an experimental study for the electronic properties of metal clusters on surfaces. For the specific case of the confined Shockley surface state on the top (111) facets of gold clusters on graphite [1] we were able to detect the quantized electronic structure with two independent experimental techniques, scanning tunneling spectroscopy (STS) and ultraviolet photoelectron spectroscopy (UPS). Here we present new UPS data and their analysis which shows a quantitative agreement if we compare the density of states, extracted from the STS spectra by averaging over the cluster size distribution, with the UPS spectra using a deconvolution to compensate the dynamic final state effect [2] which leads to a systematic asymmetric broadening of all valance band UPS features [3].

[1] I. Barke, H. Hövel, Phys. Rev. Lett. 90, 166801 (2003).

[2] H. Hövel, B. Grimm, M. Pollmann, B. Reihl, Phys. Rev. Lett. 81, 4608 (1998).

[3] H. Hövel, I. Barke, Prog. Surf. Sci., submitted for publication.