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Osnabrück 2002 – wissenschaftliches Programm

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A: Atomphysik

A 9: Poster I

A 9.11: Poster

Mittwoch, 6. März 2002, 11:00–13:00, Schloss

Photoassociation of cold Rubidium atoms to neutral molecules — •I. Mistrik1, M. Kemann1, H. Helm1, C. Wiliams2, and P. S. Julienne21Fak. f. Physik, Univ.Freiburg, 79104 Freiburg — 2NIST Gaithersburg, MD USA.

The long-range interaction between excited and ground state Rb atoms within 15 GHz of the Rb(5p3/2,fa=3) + Rb(5s,fb=2) dissociation limits is studied by high resolution photoassociation spectrosccopy in a MOT, detecting neutral Rb2 molecules via two-photon ionization. Vibrational levels in the long-range, hyperfine-split Og states are identified as the dominant features leading to the formation of stable molecules in the photoassociation process. A break-off in the vibrational bands is identified in both series, at positions matching the energetic location of the potential energy barriers predicted in the hyperfine manifolds just above the Rb(5p3/2,fa=3) + Rb(5s,fb=2) dissociation limit. Empirical potential energy curves are derived from the data. They are found to be in good agreement with theoretical predictions [1]. Research supported by the DFG (SFB 276, TP C16).

[1] C. J. Williams and P. S. Julienne, J. Chem. Phys. 101, 2634 (1994).

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