Feshbach resonances in ultracold 85Rb

We present 17 experimentally confirmed Feshbach resonances in optically trapped Rb-85. Seven of the resonances are in the ground-state channel (f, m(f)) = (2,+ 2) + (2,+ 2) and nine are in the excited-state channel (2, -2) + (2, -2). We find a wide resonance at high field in each of the two channels, offering possibilities for the formation of larger 85Rb condensates and studies of few-body physics. A detailed coupled-channel analysis is presented to characterize the resonances and also provides an understanding of the inelastic losses observed in the excited-state channel. In addition we have confirmed the existence of one narrow resonance in a (2,+ 2) + (3,+ 3) spin mixture. DOI: 10.1103/PhysRevA.87.033611