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Related Experiment Videos

Bubble formation and decay in 3He and 4He clusters.

K Von Haeften1, T Laarmann, H Wabnitz

  • 1Hamburger Synchrotronstrahlungslabor HASYLAB at Deutsches Elektronen Synchrotron DESY, Notkestrasse 85, 22603 Hamburg, Germany.

Physical Review Letters
|June 13, 2002
PubMed
Summary

Researchers studied energy transfer in helium clusters using luminescence spectroscopy. They found bubble velocities in helium-4 clusters are higher than in helium-3 clusters, revealing insights into cluster dynamics.

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Area of Science:

  • Atomic and Molecular Physics
  • Condensed Matter Physics
  • Quantum Fluids

Background:

  • Helium clusters (3He and 4He) are fundamental systems for studying quantum phenomena.
  • Understanding energy transfer mechanisms is crucial for characterizing cluster behavior.

Purpose of the Study:

  • To investigate energy transfer dynamics in electronically excited helium clusters.
  • To analyze the influence of cluster size and isotopic composition on luminescence.
  • To determine the velocity of bubbles within helium clusters.

Main Methods:

  • Utilized monochromatic synchrotron radiation for electronic excitation.
  • Employed luminescence spectroscopy to analyze emitted light.
  • Correlated luminescence intensity, cluster diameter, and radiative lifetime.

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Main Results:

  • Observed distinct emission bands (sharp, broadened, shifted) dependent on cluster size and isotope.
  • Identified emission originating from within bubbles or after desorption.
  • Deduced an average bubble velocity of ~7 m/s in 4He clusters.
  • Found significantly lower bubble velocities in nonsuperfluid 3He clusters.

Conclusions:

  • Helium cluster emission characteristics are sensitive to size and isotopic effects.
  • Bubble dynamics differ notably between 4He and 3He clusters.
  • Luminescence spectroscopy provides a method to probe internal cluster dynamics and bubble velocities.