Hannover 2010 – wissenschaftliches Programm
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A: Fachverband Atomphysik
A 8: Poster I
A 8.9: Poster
Dienstag, 9. März 2010, 16:30–19:00, Lichthof
Angle-resolved photoelectron spectroscopy of metal clusters — •Adam Piechaczek, Christian Hock, Raphael Kuhnen, Christof Bartels, and Bernd v.Issendorff — Fakultät für Mathematik und Physik, Universität Freiburg, Stefan-Meier Str.19, 79104 Freiburg
Angle and energy resolved photoelectron spectroscopy of size-selected K 55−, Ag55− and Cu55− clusters
has been performed. The electrons are photodetached by a ns laser pulse with photon wavelengths between 248 nm and 428 nm.
The photoelectron angular distributions (PADs) of the outgoing electrons contain information about the angular momentum
character of the bound state electrons. In the case of one photon excitation the PADs can be described by a single anisotropy parameter β. This parameter has been extracted for transitions from electrons detached from different bound states of the clusters as a function of photon energy. The data is compared with our results for sodium clusters [1].
When the evolutions of the betaparameter are plotted against the wavenumber k of the outgoing electrons
multiplied by the clusterradius, the positions of the minima are astonishingly similar for the peaks
of the 1g levels.
This seems to indicate a very similar effective potential which is seen by the electron for the different clusters species.
In this case the evolution of beta could possibly be described in a single active electron model.
[1] C. Bartels et al., Science 323, 1323-1327 (2009)