Abstract
We probe -wave collisions of laser-cooled atoms with Zeeman-resolved photoassociation spectroscopy. We observe that these collisions exhibit a magnetically tunable Feshbach resonance, and determine that this resonance tunes to zero energy at a magnetic field of . This result indicates that the self-interaction energy of an Bose-Einstein condensate can be magnetically tuned. We also demonstrate that Zeeman-resolved photoassociation spectroscopy provides a useful new tool for the study of ultracold atomic collisions.
- Received 13 March 1998
DOI:https://doi.org/10.1103/PhysRevLett.81.69
©1998 American Physical Society