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Related Experiment Videos

Cold collision frequency shift in two-dimensional atomic hydrogen.

J Ahokas1, J Järvinen, S Vasiliev

  • 1Wihuri Physical Laboratory, Department of Physics, University of Turku, 20014 Turku, Finland.

Physical Review Letters
|March 16, 2007
PubMed
Summary
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We measured the cold collision frequency shift in atomic hydrogen gas on superfluid helium-4. The clock shift was 100 times smaller than predicted, offering new insights into surface interactions.

Area of Science:

  • Atomic Physics
  • Quantum Fluids
  • Surface Science

Background:

  • Atomic hydrogen interactions on surfaces are crucial for understanding quantum phenomena.
  • Superfluid helium-4 provides a unique, low-temperature substrate for studying surface-adsorbed atoms.
  • Previous theoretical models predicted specific collision frequency shifts based on mean field theory and scattering lengths.

Purpose of the Study:

  • To experimentally measure the cold collision frequency shift of atomic hydrogen adsorbed on superfluid helium-4.
  • To investigate the contributions of dipolar and exchange interactions to the resonance line shifts.
  • To compare experimental findings with theoretical predictions.

Main Methods:

  • Utilized two-photon electron and nuclear magnetic resonance techniques.

Related Experiment Videos

  • Performed measurements in a 4.6 Tesla magnetic field.
  • Analyzed resonance line shifts as a function of surface density (sigma) at temperatures below 90 mK.

    • Main Results:

    • The clock shift (Delta nu(c)) was found to be -1.0(1) x 10(-7) Hz cm(-2) x sigma.
    • This measured shift is approximately 100 times smaller than predicted by mean field theory.
    • Both dipolar and exchange interactions were found to be proportional to the surface density.

    Conclusions:

    • The experimental results deviate significantly from current theoretical predictions for 3D scattering.
    • The study highlights the importance of surface effects in atomic hydrogen interactions on superfluid helium.
    • Further theoretical work is needed to explain the observed discrepancy in collision frequency shifts.