The photoassociative spectroscopy, photoassociative molecule formation, and trapping of ultracold \mathsf{^{39}K^{85}Rb}期刊界 All Journals 搜尽天下杂志传播学术成果专业期刊搜索期刊信息化学术搜索

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The photoassociative spectroscopy, photoassociative molecule formation, and trapping of ultracold \mathsf{^{39}K^{85}Rb}

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

Institution:	(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

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 $^{3}\Sigma^{ + })$ state and (in some cases) the singlet (X $^{1}\Sigma^{ + })$ ground state. The triplet (a $^{3}\Sigma^{ + })$ 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 $^{1}\Pi \sim$ 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 $^{3}\Sigma^{ + }$ (or X $^{1}\Sigma^{ + })$ molecules; we do know from Kasahara et al. that levels of the 1 $^{1}\Pi \sim$ 4(1) and 2 $^{1}\Pi \sim$ 5(1) states in the intra-asymptote region are predissociated. A small fraction ( $\le$ 1/3) of the triplet (a $^{3}\Sigma^{ + })$ 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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