Dissociation of ultracold molecules with Feshbach resonances

The dissociation of ultracold molecules by ramping the magnetic field across a Feschbach resonance, was analyzed. It was observed that a reverse ramp dissociates the molecules. The kinetic energy released in the dissociation process was used to measure the widths of four Feschbach resonances in ⁸⁷Rb. This method was used to determine the narrow resonances even in the presence of significant magnetic-field noise. The results show that a quasimonoenergetic atomic wave was created by jumping the magnetic field across the Feshbach resonance.