Hamburg 2009 – scientific programme
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MO: Fachverband Molekülphysik
MO 13: Molekülphysik Poster 1
MO 13.2: Poster
Tuesday, March 3, 2009, 16:30–19:00, VMP 8 Foyer
Fourier-transform spectroscopy on Sr2 for modeling cold collisions — •Alexander Stein, Horst Knöckel, and Eberhard Tiemann — Leibniz Universität Hannover, Welfengarten 1, 30167 Hannover
Strontium could be a candidate for a new optical frequency standard (see e.g. A. D. Ludlow et.al., Science 319, 1805 (2008)). Hence there is high interest in cooling and trapping of cold strontium atoms. Additionally, ultracold Sr2 molecules are proposed to offer good opportunities for new and exciting experiments as the precise measurement of the time variation of the electron-proton mass ratio (T. Zelevinsky, S. Kotochigova, and J. Ye, Phys. Rev. Lett. 100, 043201 (2008)). Nevertheless there are no sufficiently precise ground state potentials available for the Sr2 molecule allowing the direct calculation of collisional properties like the scattering length, and still only few of the excited electronic states are spectroscopically investigated.
We report on new spectroscopic investigations by Fourier-transform spectroscopy of laser induced fluorescence in a heat pipe setup. Our derived potentials show significant deviations compared to the previously most precise work (G. Gerber, R. Möller, and H. Schneider, J. Chem. Phys. 81, 1538 (1984)) due to a change in the rotational assignment.
The current status of the experiment and improved potentials of the X1Σg+ ground state (including the long range region) and excited state 2(A)1Σu+ will be presented. Improved estimations of the ground state scattering lengths for all combinations of natural isotopes are given.