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Elastic Collisions: Introduction01:00

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An elastic collision is one that conserves both internal kinetic energy and momentum. Internal kinetic energy is the sum of the kinetic energies of the objects in a system. Truly elastic collisions can only be achieved with subatomic particles, such as electrons striking nuclei. Macroscopic collisions can be very nearly, but not quite, elastic, as some kinetic energy is always converted into other forms of energy such as heat transfer due to friction and sound. An example of a nearly...
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Cooling an Optically Trapped Ultracold Fermi Gas by Periodical Driving
11:21

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Published on: March 30, 2017

Inelastic collisions in optically trapped ultracold metastable ytterbium.

A Yamaguchi1, S Uetake, D Hashimoto

  • 1Department of Physics, Graduate School of Science, Kyoto University, Kyoto 606-8502, Japan.

Physical Review Letters
|December 31, 2008
PubMed
Summary

Researchers measured inelastic loss in cold, dense metastable Ytterbium (Yb[3P2]) atoms. They observed rapid two-body trap loss, determining an inelastic collision rate constant for Yb[3P2] atoms.

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Area of Science:

  • Atomic Physics
  • Quantum Gases

Background:

  • Metastable atomic states are crucial for quantum simulations and atom optics.
  • Controlling inelastic collisions is essential for achieving Bose-Einstein condensation and quantum degeneracy.

Purpose of the Study:

  • To measure inelastic loss in dense, cold metastable Ytterbium (Yb[3P2]) atoms.
  • To determine the inelastic collision rate constant for Yb[3P2].

Main Methods:

  • Utilizing an optical far-off-resonance trap to confine Ytterbium atoms.
  • Trapping Yb[3P2] atoms at high densities (2 x 10^13 cm^-3) and low temperatures (2 microK).
  • Observing and quantifying two-body trap loss.

Main Results:

  • Achieved high-density, ultracold samples of Yb[3P2] atoms.
  • Observed rapid two-body inelastic loss.
  • Measured the inelastic collision rate constant as 1.0(3) x 10^-11 cm^3 s^-1.
  • Provided evidence for fine-structure changing collisions.

Conclusions:

  • Ultracold metastable Ytterbium atoms exhibit significant inelastic loss.
  • The measured collision rate impacts the feasibility of degenerate Yb gases.
  • Further investigation into fine-structure changing collisions is warranted.