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Stuttgart 2012 – scientific programme

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A: Fachverband Atomphysik

A 21: Poster: Precision spectroscopy of atoms and ions

A 21.2: Poster

Tuesday, March 13, 2012, 16:30–19:00, Poster.V

Spectroscopic reference for the measurement of the hyperfine transition frequency of highly charged bismuth ionsSebastian Albrecht1, •Heiko Jestädt1, Sanah Altenburg1, Tobias Murböck1, Manuel Vogel1,2, Gerhard Birkl1, and the SPECTRAP collaboration21Institut 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)

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