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Related Experiment Videos

"Eclipse" effect in the scattering of weakly bound helium clusters.

Anton Kalinin1, Oleg Kornilov, Lev Rusin

  • 1Max-Planck-Institut für Strömungsforschung, Göttingen, Germany.

Physical Review Letters
|November 5, 2004
PubMed
Summary

We measured how Krypton (Kr) atoms scatter off helium (He) clusters. Kr atoms interact with helium dimers independently, but interact more with larger helium clusters.

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Area of Science:

  • Atomic and molecular physics
  • Scattering theory
  • Quantum mechanics

Background:

  • Understanding atom-cluster interactions is crucial in atomic and molecular physics.
  • Previous studies have explored scattering dynamics of noble gases with small atomic clusters.

Purpose of the Study:

  • To measure total scattering cross sections for Krypton (Kr) atoms interacting with helium (He) dimers, trimers, and tetramers.
  • To investigate the nature of Kr-He cluster interactions across a range of velocities.

Main Methods:

  • Experimental measurement of total cross sections using a cluster beam apparatus.
  • Varying cluster beam velocities from 250 m/s to 820 m/s.
  • Analysis using impulse approximation and Glauber theory concepts.

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Main Results:

  • Helium dimer cross sections are approximately twice that of a single helium atom, indicating independent Kr scattering.
  • Trimer and tetramer cross sections are larger than predicted by simple independent scattering models.
  • Results are consistent with a large helium dimer bond distance (~50 Å).

Conclusions:

  • Krypton atoms scatter independently from helium atoms in helium dimers.
  • Larger helium clusters (trimers, tetramers) exhibit more complex scattering behavior.
  • The impulse approximation with multiple "eclipse" corrections effectively models these interactions.