Hannover 2016 – scientific programme
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A: Fachverband Atomphysik
A 40: Precision spectroscopy of atoms and ions III (with Q)
A 40.6: Talk
Friday, March 4, 2016, 12:15–12:30, f428
Towards Electron Affinity Measurements of Radioactive Elements: Laser Photodetachment of Negative Ions at CERN/ISOLDE — Sebastian Rothe2,3,5, •Reinhard Heinke1, Valentin Fedosseev2, Thomas Day Goodacre2,5, Dag Hanstorp3, Tobias Kron1, Yuan Liu4, Bruce Marsh2, Annie Ringwall-Moberg3, Ralf Erik Rossel2, Julia Sundberg3, Jakob Welander3, and Klaus Wendt1 — 1JGU Mainz — 2EN Department, CERN — 3University of Gothenburg — 4Oak Ridge National Laboratory — 5University of Manchester
Modern on-line isotope separators such as ISOLDE at CERN yield access to a wide variety of exotic nuclei. Besides investigations on nuclear properties of rare isotopes, these facilities allow for detailed studies on the fundamental atomic structures of the few all-radioactive elements across the Periodic Table. In this respect, two values are of elementary importance: (a) The first ionization potential (IP), i.e. the required energy to remove an electron from the neutral atom and produce a positively charged ion, and (b) the electron affinity (EA), i.e. the binding energy of an extra electron to form a negatively charged ion. For all-radioactive elements, their knowledge is even more relevant, as they are required as input for quantum chemical calculations on the behaviour within chemical compounds. Whereas the IPs of the all-radioactive elements Polonium and Astatine were precisely measured at ISOLDE via Rydberg spectroscopy recently, the EAs of these elements are still under investigation.
The talk will give an overview of the experimental setup as well as on the measurement technique, applying laser photodetachment spectroscopy with a high performance, high repetition rate tuneable laser system. First results on iodine carried out on a negative ion beam at ISOLDE are discussed together with alternatives for negative ion production at ISOLDE and an outlook on the envisaged experiments.