title: Production efficiency of ultracold feshbach molecules in bosonic and fermionic systems.
abstract: We investigate the production efficiency of ultracold molecules in bosonic 85Rb and fermionic 40K when the magnetic field is swept across a Feshbach resonance. For adiabatic sweeps of the magnetic field, our novel model shows that the conversion efficiency of both species is solely determined by the phase space density of the atomic cloud, in contrast with a number of theoretical predictions. In the nonadiabatic regime our measurements of the 85Rb molecule conversion efficiency follow a Landau-Zener model.
authors.affiliation: JILA, National Institute of Standards and Technology and the University of Colorado, Boulder, Colorado 80309-0440, USA.
authors.forename: E
authors.initials: E
authors.lastname: Hodby
authors.forename: S T
authors.initials: ST
authors.lastname: Thompson
authors.forename: C A
authors.initials: CA
authors.lastname: Regal
authors.forename: M
authors.initials: M
authors.lastname: Greiner
authors.forename: A C
authors.initials: AC
authors.lastname: Wilson
authors.forename: D S
authors.initials: DS
authors.lastname: Jin
authors.forename: E A
authors.initials: EA
authors.lastname: Cornell
authors.forename: C E
authors.initials: CE
authors.lastname: Wieman