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Effective Atom-Molecule Conversions Using Radio Frequency Fields.

Yijue Ding1, Jesús Pérez-Ríos1, Chris H Greene1,2

  • 1Department of Physics and Astronomy, Purdue University, West Lafayette, IN, USA.

Chemphyschem : a European Journal of Chemical Physics and Physical Chemistry
|August 12, 2016
PubMed
Summary
This summary is machine-generated.

Researchers explored ultracold 87 Rb atom-molecule conversion using radio frequency fields. Long coherence times in ultracold gases enable sustained, oscillatory atom-molecule population transfer.

Keywords:
cold moleculesphotoassociationradio frequency fieldstime-dependent methodsultracold atoms

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Area of Science:

  • Atomic, Molecular, and Optical Physics
  • Quantum Gases
  • Ultracold Atomic Systems

Background:

  • Inspired by Wieman group's experiment on atom-molecule transfer using magnetic fields near Feshbach resonance.
  • Ultracold atomic gases provide a unique environment for studying quantum phenomena due to well-defined collision energies.

Purpose of the Study:

  • To investigate atom-molecule population transfer in ultracold 87 Rb gas induced by a radio frequency (RF) field.
  • To study the dynamics of both bound-bound and free-bound transitions using a time-dependent collision theory.

Main Methods:

  • Development of a time-dependent collision theory utilizing two-channel model potentials.
  • Wave-packet dynamical simulations to analyze population transfer.
  • Investigation of parameters including temperature, detuning, and RF field amplitude.

Main Results:

  • Detailed analysis of the effects of temperature, detuning, and RF amplitude on atom-molecule conversion efficiency.
  • Observation of oscillatory atom-molecule conversion in simulations.
  • Identification of long wave-packet coherence time as the origin of oscillations.

Conclusions:

  • The study demonstrates the feasibility of inducing and controlling atom-molecule population transfer in ultracold 87 Rb using RF fields.
  • Long coherence times inherent in ultracold gases are crucial for observing sustained oscillatory conversion.
  • The findings contribute to understanding quantum dynamics and control in ultracold atomic systems.