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A: Fachverband Atomphysik

A 24: Photoionization

A 24.2: Talk

Thursday, March 13, 2008, 14:15–14:30, 3D

Photoionization cross sections of helium in two and three dimensions — •Johannes Eiglsperger¹, Javier Madroñero^1,2, Harald Friedrich¹, and Bernard Piraux² — ¹Physik Department (T30a), TU München, Germany — ²Unité de physique atomique, moléculaire et d’optique, UC Louvain, Belgium

We explore the regime of highly doubly excited states in two-electron atoms. Photoionization cross sections of planar helium are calculated for this regime and the fluctuations in these cross sections are discussed. Furthermore, we describe the state-of-the-art of our approach for 3D helium, which combines the complex rotation method with an appropriate expansion of the atom wave function in a basis of products of Coulomb-Sturmian functions of the electron radial coordinates with independent dilation parameters for the two electrons and bipolar harmonics of the angular coordinates.