Berlin 2005 – wissenschaftliches Programm

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SYPE: Der Photoeffekt im Licht neuester Forschung


SYPE 2.4: Hauptvortrag

Freitag, 4. März 2005, 18:00–18:30, HU Senatssaal

The Electronic Structure of Charged Matter: Photoionization of Positive and Negative Ions — •Nora Berrah — Physics Department, Western Michigan University, Kalamazoo, Mi, USA

Prior to third generation light sources, the electronic structure of charged matter was investigated in Europe via challenging photoionization studies of positive ions [1, 2], due to tenuous targets and low photon flux. The new and improved light sources have allowed a rebirth in fundamental studies of photon-matter interactions, and in particular of the electronic structure and dynamics of negative and positive ions.

We will present at the symposium, new unprecedented results of photoionization studies in both positive and negative ions conducted at Super-ACO, France [3], ASTRID, Denmark [4], and the ALS [5, 6], USA. Specifically, the electronic dynamics was examined, including the mechanisms of electronic decay processes of multi-excited states, nuclear dynamics and structure. This work will in general extend our quantum mechanical understanding of complex systems.
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A. A. Covington et al., Phys. Rev. Lett. 87, 243002 (2001); J. Phys. B. 34, L735 (2001).
N. Berrah et al., PRL 87, 253002 (2001); PRL 88, 093001 (2002).

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