Photoassociative spectroscopy at long range in ultracold strontium

Details Photoassociative spectroscopy at long range in ultracold strontium Photoassociative spectroscopy at long range in ultracold strontium

2004-10-05

arxiv.org/abs/physics/0410030v2

Physics

Atomic Physics

4 pages, 4 figures, submitted

Scientific paper

10.1103/PhysRevLett.94.083004

We report photoassociative spectroscopy of $^{88}$Sr$_2$ in a magneto-optical trap operating on the ${^1S_0}\to{^3P_1}$ intercombination line at 689 nm. Photoassociative transitions are driven with a laser red-detuned by 600-2400 MHz from the ${^1S_0}\to{^1P_1}$ 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 ${^1P_1}$ atomic lifetime ($\tau=5.22 \pm 0.03$ ns) and resolves a discrepancy between experiment and recent theoretical calculations.

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