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Related Experiment Videos

Atom-molecule collisions in an optically trapped gas.

N Zahzam1, T Vogt, M Mudrich

  • 1Laboratoire Aimé Cotton, CNRS, Campus d'Orsay Bâtiment 505, 91405 Orsay, France.

Physical Review Letters
|February 21, 2006
PubMed
Summary

Cold inelastic collisions between cesium atoms and molecules were measured in a CO2 laser trap. Atom-molecule collision rates were found to be approximately 2.6 x 10(-11) cm3 s(-1), independent of molecular state.

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Area of Science:

  • Atomic, Molecular, and Optical (AMO) Physics
  • Quantum Chemistry
  • Laser Spectroscopy

Background:

  • Understanding cold atom-molecule collisions is crucial for quantum simulation and ultracold chemistry.
  • Cesium (Cs) and Cesium dimer (Cs2) systems provide a well-controlled platform for studying these interactions.
  • Laser dipole traps offer precise control over atomic and molecular samples at ultracold temperatures.

Purpose of the Study:

  • To investigate and quantify the rate coefficients of cold inelastic collisions between cesium atoms and cesium molecules.
  • To determine the influence of molecular rovibrational states on atom-molecule collision dynamics.
  • To measure the trap lifetimes of atomic and molecular cesium samples and estimate molecule-molecule collision rates.

Main Methods:

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  • Utilizing a CO2 laser dipole trap to confine cesium atoms and molecules.
  • Employing techniques to prepare and detect specific molecular rovibrational states.
  • Measuring sample decay rates to infer collision cross-sections and trap loss mechanisms.

Main Results:

  • Inelastic atom-molecule collision rate coefficient measured at approximately 2.6 x 10(-11) cm3 s(-1).
  • Collision rate was found to be largely independent of the populated molecular rovibrational state.
  • Pure molecular cesium trap lifetimes (0.3-1 s) were observed to be approximately four times shorter than atomic trap lifetimes.
  • Inelastic molecule-molecule collision rate estimated to be around 10(-11) cm3 s(-1).

Conclusions:

  • Cold inelastic collisions between Cs atoms and Cs2 molecules are significant and quantifiable.
  • The rovibrational state of Cs2 has a minimal impact on the measured inelastic collision rate with Cs atoms.
  • Rest gas collisions are the primary limitation for trap lifetimes in both atomic and molecular samples.
  • Molecule-molecule inelastic collisions also contribute to trap loss, with an estimated rate coefficient.