title: Dramatic reductions in inelastic cross sections for ultracold collisions near Feshbach resonances.
abstract: We show that low-energy inelastic cross sections can decrease as well as increase in the vicinity of a zero-energy Feshbach resonance. When an external field is used to tune across such a resonance, the real and imaginary parts of the scattering length show asymmetric oscillations with both peaks and troughs. In favorable circumstances, the inelastic collision rate can be reduced to almost zero. This may be important for efforts to achieve evaporative and sympathetic cooling for molecules.
authors.affiliation: Department of Chemistry, University of Durham, South Road, Durham, DH1 3LE, United Kingdom.
authors.forename: Jeremy M
authors.initials: JM
authors.lastname: Hutson
authors.forename: Musie
authors.initials: M
authors.lastname: Beyene
authors.forename: Maykel Leonardo
authors.initials: ML
authors.lastname: González-Martínez