Hannover 2013 – scientific programme

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A: Fachverband Atomphysik

A 21: Poster: Photoionization

A 21.1: Poster

Tuesday, March 19, 2013, 16:00–18:30, Empore Lichthof

Investigation of shake-up processes in Beryllium with the Multiconfigurational time-dependent Hartree-Fock method — •Christopher Hinz, David Hochstuhl, and Michael Bonitz — Institut für Theoretische Physik und Astrophysik, Christian-Albrechts-Universität zu Kiel, Leibnizstr. 15 24098 Kiel, Germany

The Multiconfigurational time-dependent Hartree-Fock (MCTDHF) method is an extension of Hartree-Fock to gradually include correlations, in addition to the contributions of the mean-field. Extending our previous work on Helium [1], we apply MCTDHF to the full four-electron system of Beryllium in an external electro-magnetic field for different amounts of correlation, while previous works [2,3] using traditional approaches—like Configuration interaction (CI)—were only capable of treating two active electrons. Of special interest are shake-up processes, in which a second electron is excited during photoionization, which can be subsequently ionized by a second photon with a higher resulting electron energy. Since the shake-up is a consequence of correlations between the shake-up electron and the first photoelectron this process is not treatable with pure Hartree-Fock methods. To resolve the time evolution of the shake-up process, we apply a pump-probe scheme to the atomic system, which is not accessible with a time-independent method.
[1] D. Hochstuhl, M. Bonitz, J. Chem. Phys. 134, 084106 (2011)
[2] S. Laulan, H. Bachau, Physical review A 69, 033408 (2004)
[3] F.L. Yip et al., Physical review A 81, 063419 (2010)