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A: Atomphysik

A 5: Hauptvortr
äge: Elektronen- und Ionendynamik

A 5.1: Hauptvortrag

Dienstag, 14. März 2006, 10:40–11:10, H7

Negative Ions - Fragile Quantum Systems — •Dag Hanstorp — Department of Physics, Göteborg University, SE-41296 Göteborg, Sweden

Negative ions are fragile quantum systems with binding energies about an order of magnitude smaller than in atoms. The extra electron does not experience the Coulomb force from the nucleus at large distances. Instead, core polarization induced by the extra electron stabilizes the ion. The correlated motion of the electrons require theoretical models that go beyond the independent particle approximation, and experimental investigations of the structure and dynamics of negative ions can hence lead to an increased understanding of many-electron effects. A review of the progress in the exploration of the structure and dynamics of negative ions will be presented. In particular, result obtained using new experimental techniques, such as resonance ionisation spectroscopy, storage rings, synchrotron radiation will be discussed. The experimental results will, wherever possible, be compared with recent theoretical studies. Further, the possible use of laser photodetachment as a tool to improve the selectivity in Accelerator Mass Spectrometry (AMS) will be discussed.