Hannover 2010 – scientific programme
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MO: Fachverband Molekülphysik
MO 8: Poster: Electronic Spectroscopy
MO 8.1: Poster
Tuesday, March 9, 2010, 16:00–18:30, Lichthof
Fourier-transform spectroscopy on Sr2 — •Alexander Stein, Horst Knöckel, and Eberhard Tiemann — Institut für Quantenoptik, Leibniz Universität Hannover, Welfengarten 1, 30167 Hannover
There is a 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 detection of the time variation of the electron-proton mass ratio (T. Zelevinsky and S. Kotochigova and J. Ye, Phys. Rev. Lett. 100, 043201 (2008)). Nevertheless there was no sufficiently precise molecular ground state potential available for the Sr2 molecule allowing the direct calculation of collisional properties like the scattering length, and still only few of the excited states are spectroscopically investigated at least to a small part.
We now report on new spectroscopic investigations using laser induced fluorescence out of a heat pipe and a Fourier transform spectrometer. Our results on excited states, which were previously experimentally unknown at least from the gas phase, like the state 11Σu+ and the state 11Πu, show strong deviations to the available ab initio calculations. The current status of the experiment and improved potentials of the X1Σg+ ground state (including the asymptotic region) and excited states as the states 1 and 2(A)1Σu+ and the state 11Πu will be presented, together with improved estimations of the ground state scattering lengths for all combinations of natural abundant isotopes.