Document Type

Article

Publication Date

Spring 4-1-2005

Publication Title

Physical Review Letters

ISSN

0031-9007

Volume

94

Issue

12

First Page

120402-1

Last Page

120402-4

DOI

10.1103/PhysRevLett.94.120402

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.

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