Enhancement of the formation of ultracold $^{85}$Rb$_2$ molecules due to resonant coupling

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dc.creatorPechkis, H. K.
dc.creatorWang, D.
dc.creatorHuang, Y.
dc.creatorEyler, E. E.
dc.creatorGould, P. L.
dc.creatorStwalley, W. C.
dc.creatorKoch, C. P.
dc.date2007-07-17
dc.date.accessioned2026-07-07T10:13:58Z
dc.date.available2026-07-07T10:13:58Z
dc.descriptionWe have studied the effect of resonant electronic state coupling on the formation of ultracold ground-state $^{85}$Rb$_2$. Ultracold Rb$_2$ molecules are formed by photoassociation (PA) to a coupled pair of $0_u^+$ states, $0_u^+(P_{1/2})$ and $0_u^+(P_{3/2})$, in the region below the $5S+5P_{1/2}$ limit. Subsequent radiative decay produces high vibrational levels of the ground state, $X ^1Σ_g^+$. The population distribution of these $X$ state vibrational levels is monitored by resonance-enhanced two-photon ionization through the $2 ^1Σ_u^+$ state. We find that the populations of vibrational levels $v''$=112$-$116 are far larger than can be accounted for by the Franck-Condon factors for $0_u^+(P_{1/2}) \to X ^1Σ_g^+$ transitions with the $0_u^+(P_{1/2})$ state treated as a single channel. Further, the ground-state molecule population exhibits oscillatory behavior as the PA laser is tuned through a succession of $0_u^+$ state vibrational levels. Both of these effects are explained by a new calculation of transition amplitudes that includes the resonant character of the spin-orbit coupling of the two $0_u^+$ states. The resulting enhancement of more deeply bound ground-state molecule formation will be useful for future experiments on ultracold molecules.
dc.description6 pages, 5 figures; corrected author list
dc.identifierhttps://arxiv.org/abs/0707.2401
dc.identifierhttp://arxiv.org/abs/0707.2401
dc.identifierPhys. Rev. A 76, 022504 (2007)
dc.identifierdoi:10.1103/PhysRevA.76.022504
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/172722
dc.subjectAtomic Physics
dc.titleEnhancement of the formation of ultracold $^{85}$Rb$_2$ molecules due to resonant coupling
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