Dresden 2011 – wissenschaftliches Programm

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A: Fachverband Atomphysik

A 4: Precision spectroscopy of atoms and ions I

A 4.5: Vortrag

Montag, 14. März 2011, 15:00–15:15, BAR 205

Spectroscopic reference for the measurement of the transition frequency of highly charged bismuth ions — Sanah Altenburg¹, •Sebastian Albrecht¹, 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 within 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.

The expected wavelength of the transition between the hyperfine ground states is located near previously measured resonances of the 1S-2S transitions of muonium, deuterium and hydrogen. For those earlier measurements some molecular resonances of tellurium vapour have been calibrated with sub-Megahertz precision. These references can be used to create new references in the regime of the expected bismuth transition.

The spectrum between these calibrated resonances has been measured with an accuracy corresponding to the one of our laser system. In our presentation we describe the technique used and the performance reached.