Photoassociative spectroscopy at long range in ultracold strontium |
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Authors: | Nagel S B Mickelson P G Saenz A D Martinez Y N Chen Y C Killian T C Pellegrini P Côté R |
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Affiliation: | Department of Physics and Astronomy and Rice Quantum Institute, Rice University, Houston, TX 77251, USA. |
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Abstract: | We report photoassociative spectroscopy of 88Sr(2) in a magneto-optical trap operating on the 1S0-->3P1 intercombination line at 689 nm. Photoassociative transitions are driven with a laser red detuned by 600-2400 MHz from the 1S0-->1P1 atomic resonance at 461 nm. Photoassociation takes place at extremely large internuclear separation, and the photoassociative spectrum is strongly affected by relativistic retardation. A fit of the transition frequencies determines the 1P1 atomic lifetime (tau=5.22+/-0.03 ns) and resolves a discrepancy between experiment and recent theoretical calculations. |
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