  We present 17 experimentally confirmed Feshbach resonances in optically
trapped 85Rb. 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 new
possibilities for the formation of larger 85Rb condensates and studies of
few-body physics. A detailed coupled-channels 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.
