TY - JOUR T1 - Ultracold Cs$_2$ Feshbach Spectroscopy Y1 - 2003 A1 - Cheng Chin A1 - Vladan Vuletic A1 - Andrew J. Kerman A1 - Steven Chu A1 - Eite Tiesinga A1 - Paul J. Leo A1 - Carl J. Williams AB - We have observed and located more than 60 magnetic field-induced Feshbach resonances in ultracold collisions of ground-state $^{133}$Cs atoms. These resonances are associated with molecular states with up to four units of rotational angular momentum, and are detected through variations in the elastic, inelastic, and radiative collision cross sections. These observations allow us to greatly improve upon the interaction potentials between two cesium atoms and to reproduce the positions of most resonances to accuracies better than 0.5%. Based on the relevant coupling scheme between the electron spin, nuclear spin, and orbital angular momenta of the nuclei, quantum numbers and energy structure of the molecular states beneath the dissociation continuum are revealed. Finally, we predict the relevant collision properties for cesium Bose-Einstein condensation experiments. UR - http://arxiv.org/abs/cond-mat/0312613v2 ER -