Düsseldorf 2007 – wissenschaftliches Programm
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A: Fachverband Atomphysik
A 14: Poster I - Ultra-cold atoms, ions and BEC
A 14.7: Poster
Dienstag, 20. März 2007, 16:30–18:30, Poster B
Study of the Born-Oppenheimer Approximation for Mass-scaling of Cold Collision Properties — •Stephan Falke, Eberhard Tiemann, and Christian Lisdat — Institut für Quantenoptik, Leibniz Universität Hannover, Welfengarten 1, 30167 Hannover
Ultracold collisions of atoms are often described by the s-wave scattering length. Also, positions and widths of Feshbach resonances characterize these collisions. Full information about the scattering wavefunctions is given by interaction potential curves, which can be determined by molecular spectroscopy. Adding neutrons to one of the nuclei does not alter the potential curve (Born-Oppenheimer approximation, BOA). It is possible to derive eigenvalues, Feshbach resonances, and the scattering length for different isotope combinations from a single potential simply by changing the reduced mass if the BOA is fulfilled. We study the validity of the BOA for asymptotic levels of the potential curve describing the A 1Σu+ state [1] of K2 (correlated to the 4s1/2+4p1/2 asymptote) by comparing spectra of the two isotopomers 39K2 and 39K 41K obtained by high resolution laser spectroscopy in a molecular beam.
[1] J. Chem. Phys. 125, 224303 (2006).