摘要
We report the use of photoassociative spectroscopy to determine the ground-state s-wave scattering lengths for the main bosonic isotopes of strontium, 86Sr and 88Sr. Photoassociative transitions are driven with a laser red detuned by up to 1400 GHz from the 1S0−1P1 atomic resonance at 461 nm. A minimum in the transition amplitude for 86Sr at −494±5 GHz allows us to determine the scattering lengths 610a0<a86<2300a0 for 86Sr and a much smaller value of −1a0<a88<13a0 for 88Sr