Hannover 2010 – wissenschaftliches Programm

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A: Fachverband Atomphysik

A 23: Poster II

A 23.14: Poster

Donnerstag, 11. März 2010, 16:30–19:00, Lichthof

Online Spectroscoy of Trapped Radium Isotopes — •Oscar O. Versolato, Gouri S. Giri, Joost van den Berg, Duurt Johan van der Hoek, Wilbert Kruithof, Bodhaditya Santra, Praveen Shidling, Lorenz Willmann, Hans W. Wilschut, and Klaus Jungmann — Kernfysisch Versneller Instituut, University of Groningen

Radium ions are of particular interest for a most precise measurement of Atomic Parity Violation. From a single cold and trapped ion one expects a significantly improved measurement of the weak mixing (Weinberg) angle through a determination of the light shift in the forbidden 7²S_1/2-6²D_3/2 transition. In preparation of such precision measurements the transitions relevant for this (7S-7P, 6D-7P) were observed and measured in the isotopes ²¹²Ra, ²¹³Ra and ²¹⁴Ra. The isotopes were produced at the TRIµP facility of KVI, when a ²⁰⁸Pb beam hit a solid ¹²C target. The Ra isotopes were stopped and re-ionized to Ra⁺ in a Thermal Ionizer, mass separated in a Wien Filter and cooled in a gas filled Radio Frequency Quadrupole. The ions were stored as a cloud in a Paul trap, where they also interacted with laser light. All necessary wavelengths were obtained by semiconductor lasers. The setup and the measurements will be discussed.