Phys. Rev. Lett. 81, 5109–5112 (1998)Resonant Magnetic Field Control of Elastic Scattering in Cold 85RbReceived 29 July 1998; published in the issue dated 7 December 1998 A magnetic field-dependent Feshbach resonance has been observed in the elastic scattering collision rate between atoms in the F = 2,M = -2 state of 85Rb. Changing the magnetic field by several Gauss caused the collision rate to vary by a factor of 104, and the sign of the scattering length could be reversed. The resonance peak is at 155.2(4) G and its width is 11.6(5) G. From these results we extract much improved values for the three quantities that characterize the interaction potential: The van der Waals coefficient C6, the singlet scattering length aS, and the triplet scattering length aT. © 1998 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevLett.81.5109
DOI:
10.1103/PhysRevLett.81.5109
PACS:
34.50.-s, 03.75.Fi, 32.80.Pj, 34.20.Cf
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