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A: Fachverband Atomphysik

A 11: Posters: Interaction with attosecond and VUV-light

A 11.9: Poster

Tuesday, March 11, 2008, 16:30–18:30, Poster C3

Momentum-resolved photoemission of small atomic clusters — •Rainer Unterumsberger, Matthias Hoener, Sebastian Schorb, Heiko Thomas, Thomas Möller, and Christoph Bostedt — IOAP - Technische Universität Berlin

The investigation of photoionization and photofragmentation processes of rare-gas clusters with time-of-flight spectroscopy has lead to a rather detailed knowledge about their size-dependent electronic structure. However, comparably little is known about their angular photoemission characteristics. We have used a reaction microscopy akin COLTRIMS to investigate the photoemission of small to medium sized clusters in the near threshold regime. The photoelectrons could be detected in the full solid angle and their moment could be resolved. The data show that the photoemission of clusters becomes much more isotropic for increasing cluster sizes. The data is discussed and compared to recent angle-resolved tof experiments [Rolles, PRA 75, 031201 (2007)].

We would like to thank the groups of H. Schmidt-Böcking and R. Dörner from the Universität Frankfurt for their help.