Heidelberg 2015 – wissenschaftliches Programm

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A: Fachverband Atomphysik

A 11: Poster: Atomic clusters (with MO)

A 11.3: Poster

Montag, 23. März 2015, 17:00–19:00, C/Foyer

Linear Paul-trap for core-level photoelectron spectroscopy of Metal Clusters at FLASH — •Michael Köther, Franklin Martinez, Patrice Oelßner, Josef Tiggesbäumker, and Karl-Heinz Meiwes-Broer — Universität Rostock, Institut für Physik, 18055 Rostock

Previous photoelectron spectroscopy experiments at the free electron laser in Hamburg (FLASH) have shown distinct changes in the binding energy of lead 5d and 4f levels as a function of cluster size[1,2]. With higher photon energies available it is now possible to excite even deeper core electrons. On the other hand photoionization cross sections decrease rapidly. For compensation higher target densities are necessary and will be achieved by a new setup currently under construction. The main changes include a cryogenic, linear Paultrap and a radio frequency ion buncher. In the trap, cluster ions from a continuous source are cooled and accumulated, thus approaching a structural ground state, before pulsed extraction into the FEL interaction region. This contribution reports about simulations and first test runs of the Paultrap. The work is funded by the BMBF FSP 302, and supported by the DFG (SFB 652). [1] V. Senz et al., Phys.Rev.Lett.,102, 138303 (2009). [2] J. Bahn et al., New J. Phys., 14, 075008 (2012).