Stuttgart 2012 – scientific programme

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A: Fachverband Atomphysik

A 30: Precision spectroscopy of atoms and ions II

A 30.3: Talk

Thursday, March 15, 2012, 11:30–11:45, V47.03

Accurate spectroscopic references near 488 nm — •Sebastian Albrecht¹, Heiko Jestädt¹, Sanah Altenburg¹, Tobias Murböck¹, Manuel Vogel¹, Gerhard Birkl¹, and the SPECTRAP collaboration² — ¹Institut für Angewandte Physik, Technische Universität Darmstadt, Schlossgartenstraße 7, 64289 Darmstadt — ²GSI, Planckstraße 1, 64291 Darmstadt

Several current experimental ventures such as the study of the hyperfine transition of highly charged ²⁰⁹Bi⁸²⁺ ions or the excitation of Rydberg states in atomic rubidium strongly profit from a spectroscopic reference at wavelengths of 480 to 490 nm. Molecular tellurium provides a map of recorded spectra in this wavelength region [1].

We operate a frequency-quadrupled laser system for the generation of light at a wavelength of 244 nm for ²⁰⁹Bi⁸²⁺ spectroscopy [2]. The blue light available after the first frequency-doubling stage allows us to record tellurium spectra with improved accuracy. Previous measurements of the 1S-2S transition of muonium, deuterium and hydrogen as well as coinciding reference lines of an Ar⁺ laser have lead to calibrated tellurium resonances. Using these sub-Megahertz precise lines we can generate a continuous spectrum of tellurium with a span of 1.4 THz around 488 nm. This easily can be expanded to other wavelength regions in the blue for extended frequency calibration.

[1] J. Cariou and P. Luc, Atlas du spectre d’absorption de la molecule de tellure (Laboratoire Aime-Cotton, Paris, 1980)

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