Dresden 2011 – wissenschaftliches Programm

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A: Fachverband Atomphysik

A 26: Poster III

A 26.11: Poster

Donnerstag, 17. März 2011, 16:00–18:30, P2

Angular anisotropy parameters in photoionization processes of spherical metallic cluster anions — •Myroslav Zapukhlyak and Jan-Michael Rost — Max-Planck-Institut für Physik komplexer Systeme, Nöthnitzer Straße 38, 01187 Dresden, Germany

Size-selected sodium cluster anions of approximately spherical form were studied by angle resolved photoelectron spectroscopy over a broad range of photon energies [1,2]. The role of possible correlation effects in this experiment has been discussed theoretically [3]. Recently, the measurements have been extended to copper and silver cluster anions [4]. When the anisotropy parameter dependence is plotted against the impulse of the photoelectron multiplied by the cluster radius, the obtained evolution of the beta parameter is very similar for the photoelectrons from l=4 levels for different cluster species. This striking similarity in the anisotropy parameter may be seen as a counter-argument of the distinct role of correlation effects in such photoionization processes at least for the weakest bound electrons. In this theoretical study we investigate the beta parameters with the goal to elucidate the underlying physics of the photoionization process, and compare our results with the available experimental data and theoretical calculations.

[1] C. Bartels, PhD thesis, University of Freiburg, Freiburg, (2008)

[2] C. Bartels et al., Science, 323, 1323 (2009)

[3] A. V. Solov'yov et al., Phys. Rev. A, 81, 021202 (2010)

[4] A. Piechaczek et al., In DPG Frühjahrstagung AMOP, (2010)