Phys. Rev. A 79, 042716 (2009) [11 pages]Coupled system a 3Σ+ and X 1Σ+ of KLi: Feshbach resonances and corrections to the Born-Oppenheimer approximationReceived 25 February 2009; published 29 April 2009 High-resolution Fourier transform spectroscopy was used to record fluorescence progressions of KLi formed in a heat pipe. Lithium isotope effects were used to derive the adiabatic correction to the Born-Oppenheimer potential for the electronic ground state over a wide range of internuclear separations. With a short extrapolation from the experimentally determined potential functions of the coupled states X 1Σ+ and a 3Σ+ toward their common atomic asymptote, we have improved the modeling of recently observed Feshbach resonances for the fermionic atom pair 6Li and 40K. Predictions for cold collisions between different isotopologues are presented using mass scaling with or without Born-Oppenheimer corrections. Predictions for Feshbach resonance positions differ by up to 0.5 G within reach of current experimental verification. © 2009 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevA.79.042716
DOI:
10.1103/PhysRevA.79.042716
PACS:
34.50.Cx, 33.20.Kf, 33.20.Vq, 31.50.Bc
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