The photoassociative spectroscopy, photoassociative molecule formation, and trapping of ultracold mathsf{^{39}K^{85}Rb} |
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Authors: | D. Wang J. Qi M. F. Stone O. Nikolayeva B. Hattaway S. D. Gensemer H. Wang W. T. Zemke P. L. Gould E. E. Eyler W. C. Stwalley |
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Affiliation: | (1) Department of Physics, University of Connecticut, 2152 Hillside Road, CT 06269-3046 Storrs, USA;(2) Department of Physics, University of Latvia, 19 Rainis Boulevard, 15986 Riga, Latvia;(3) Department of Physics, University of Amsterdam, P.O. Box 94604, 1090 GP Amsterdam, The Netherlands;(4) Electronics and Photonics Laboratory, The Aerospace Corporation, M2-253, 2350 East El Segundo Boulevard, CA 90245-4691 El Segundo, USA;(5) Department of Chemistry, Wartburg College, IA 50677 Waverly, USA |
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Abstract: | We have observed the photoassociative spectra of colliding ultracold 39K and 85Rb atoms to produce KRb* in all eight bound electronic states correlating with the 39K (4s) + 85Rb(5p 1/2 and 5p 3/2) asymptotes. These electronically excited KRb* ultracold molecules are detected after their radiative decay to the metastable triplet (a state and (in some cases) the singlet (X ground state. The triplet (a ultracold molecules are detected by two-photon ionization at 602.5 nm to form KRb + , followed by time-of-flight mass spectroscopy. We are able to assign a majority of the spectrum to three states (2(0 + ), 2(0-), 2(1)) in a lower triad of states with similar C 6 values correlating to the K(4s) + Rb (5p 1/2) asymptote; and to five states in an upper triad of three states (3(0 + ), 3(0-), 3(1)) and a dyad of two states (4(1), 1(2)), with one set of similar C 6 values within the upper triad and a different set of similar C 6 values within the dyad. We are also able to make connection with the short-range spectra of Kasahara et al. [J. Chem. Phys. 111, 8857 (1999)], identifying three of our levels as v = 61, 62 and 63 of the 1 4(1) state they observed. We also argue that ultracold photoassociation to levels between the K(4s) + Rb (5p 3/2) and K(4s) + Rb (5p 1/2) asymptotes may be weakly or strongly predissociated and therefore difficult to observe by ionization of a (or X molecules; we do know from Kasahara et al. that levels of the 1 4(1) and 2 5(1) states in the intra-asymptote region are predissociated. A small fraction (1/3) of the triplet (a ultracold molecules formed are trapped in the weak magnetic field of our magneto-optical trap (MOT).Received: 22 September 2004, Published online: 23 November 2004PACS: 33.20.Fb Raman and Rayleigh spectra (including optical scattering) - 34.20.Cf Interatomic potentials and forces - 33.80.Ps Optical cooling of molecules; trapping |
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