title: Effective Atom-Molecule Conversions Using Radio Frequency Fields.
abstract: The present study is inspired by the Wieman group experiment [Phys. Rev. Lett. 2005, 95, 190404], in which they use a slow modulated magnetic field to effectively transfer rubidium atoms into cold molecules near a Feshbach resonance. We develop a time-dependent collision theory based on two channel model potentials to study the atom-molecule population transfer induced by a single-color radio frequency field in an ultracold87Rb gas. Wave-packet dynamical simulations allow an investigation of both bound-bound transitions and free-bound transitions. The effects of temperature, detuning and the RF amplitude on the population transfer are discussed in detail. Some of our simulations suggest that oscillatory atom-molecule conversion could originate from the long coherence time of the wave packet. This coherence time is unusually long in ultracold gases because the collision energy is typically quite well-defined.
authors: Department of Physics and Astronomy, Purdue University, West Lafayette, IN, USA.
authors: Yijue
authors: Y
authors: Ding
authors: Department of Physics and Astronomy, Purdue University, West Lafayette, IN, USA.
authors: Jesús
authors: J
authors: Pérez-Ríos
authors: Department of Physics and Astronomy, Purdue University, West Lafayette, IN, USA.|Purdue Quantum Center, West Lafayette, IN, USA.
authors: Chris H
authors: CH
authors: Greene
keywords: cold molecules; photoassociation; radio frequency fields; time-dependent methods; ultracold atoms