Stuttgart 2012 – wissenschaftliches Programm

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A: Fachverband Atomphysik

A 21: Poster: Precision spectroscopy of atoms and ions

A 21.2: Poster

Dienstag, 13. März 2012, 16:30–19:00, Poster.V

Spectroscopic reference for the measurement of the hyperfine transition frequency of highly charged bismuth ions — Sebastian Albrecht¹, •Heiko Jestädt¹, Sanah Altenburg¹, Tobias Murböck¹, Manuel Vogel^1,2, Gerhard Birkl¹, and the SPECTRAP collaboration² — ¹Institut für Angewandte Physik, Technische Universität Darmstadt, Schlossgartenstraße 7, 64289 Darmstadt — ²GSI, Planckstraße 1, 64291 Darmstadt

The investigation of the ground state hyperfine splitting of highly charged ions is one of the objectives of the experiments planned to be carried out by the SPECTRAP collaboration within the HITRAP facility at GSI. For ²⁰⁹Bi⁸²⁺ ions, transitions between hyperfine ground states can be exited using light at 243.9 nm. This light is produced in a laser system and two frequency-doubling stages resulting in 15 mW in the UV [1].

At twice the target wavelength (≈ 488 nm) the light frequency is compared to previously calibrated resonances of molecular tellurium. A maximum deviation of 6 MHz at 244 nm relative to the tellurium spectrum was found. We report on the configuration of the laser system, on an improved determination of the tellurium resonances and on further improvements in the laser system for a reduction in the remaining uncertainty of the laser frequency.

[1] S. Albrecht, S. Altenburg, C. Siegel, N. Herschbach, G. Birkl, Appl. Phys. B, DOI: 10.1007/s00340-011-4732-8 (2011)