Heidelberg 2015 – scientific programme
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MO: Fachverband Molekülphysik
MO 17: Cold Molecules 3
MO 17.2: Talk
Thursday, March 26, 2015, 11:30–11:45, PH/HS1
Cooperative effects of the hyperfine and Zeeman structure in the A−b state of Rb2 — •Markus Deiss1, Björn Drews1, Eberhard Tiemann2, and Johannes Hecker Denschlag1 — 1Institut für Quantenmaterie, Universität Ulm, 89069 Ulm, Germany — 2Institut für Quantenoptik, Leibniz Universität Hannover, 30167 Hannover, Germany
We have studied the hyperfine and Zeeman structure of spin-orbit coupled A1Σu+−b3Πu states of Rb2 molecules with small angular momentum (J=1). For this purpose, Feshbach molecules trapped in a 3D optical lattice are irradiated by cw-light of a diode laser. In a frequency scan, resonant excitation of an energy level of the A−b manifold causes molecular losses. We observe surprisingly large total hyperfine/Zeeman splittings of up to 150 MHz at a magnetic field of 1000 G. Furthermore, we find that the hyperfine/Zeeman structures of various vibrational states differ substantially. We explain the data as follows: The measured level structures arise in second order from hyperfine and Zeeman interactions which cooperatively mix the 0u+ and 0u−components of the b3Πu state that are separated due to spin-orbit coupling. We can use our measurements to estimate the energy splitting between 0u+ and 0u− for various vibrational levels.