Hannover 2010 – scientific programme

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A: Fachverband Atomphysik

A 25: Precision Spectroscopy of Atoms and Ions III

A 25.1: Talk

Friday, March 12, 2010, 10:30–10:45, F 107

Characterisation of a laser source for spectroscopy of trapped highly charged bismuth ions — •Sebastian Albrecht¹, Gerhard Birkl¹, and the SPECTRAP collaboration² — ¹Institut für Angewandte Physik, Technische Universität Darmstadt, Schlossgartenstraße 7, 64289 Darmstadt — ²GSI, Planckstraße 1, 64291 Darmstadt

Our objective is to investigate the ground state hyperfine splitting of highly charged ions. Unprecedented precision and accuracy will be achieved by applying high resolution laser spectroscopy to ions cooled and stored in a Penning trap. This experiment is carried out within the SPECTRAP collaboration at GSI within the HITRAP facility.

For ²⁰⁹Bi⁸²⁺ ions, transitions between hyperfine ground states can be exited using light at 243.9 nm. This light is produiced in a lasersystem and two frequency-doubling stages resulting in 15 mW in the UV. A Tellurium-cell was used as reference to measure the scan-range and reproduicibility in the range of 487.8 nm. In this presentation we describe schemes for laser stabilization and spectroscopic tests of the lasersystem performance.