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Imaging the He2 quantum halo state using a free electron laser.

Stefan Zeller1, Maksim Kunitski2, Jörg Voigtsberger2

  • 1Institut für Kernphysik, Goethe-Universität Frankfurt, 60438 Frankfurt, Germany; zeller@atom.uni-frankfurt.de doerner@atom.uni-frankfurt.de.

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Researchers imaged a giant helium molecule, observing quantum tunneling where nuclei entered classically forbidden regions. This visualization confirmed the universal exponential decay of particle density in tunneling phenomena.

Keywords:
clustershelium dimertunnelingwavefunction

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Area of Science:

  • Quantum Mechanics
  • Atomic and Molecular Physics
  • Chemical Physics

Background:

  • Quantum tunneling allows particles to traverse classically forbidden regions.
  • Particle density typically decays exponentially in the tunneling region.
  • This phenomenon is observed across various energy scales in nature.

Purpose of the Study:

  • To investigate quantum tunneling in an extreme molecular system.
  • To directly image the particle density within the tunneling region.
  • To experimentally determine the binding energy of the helium molecule.

Main Methods:

  • Utilized Coulomb explosion imaging.
  • Employed a free electron laser for high-resolution imaging.
  • Studied a unique, gigantic molecule composed of two helium atoms.

Main Results:

  • Achieved direct imaging of exponentially decaying particle density over two orders of magnitude.
  • Observed an 80% probability of helium nuclei being in the classically forbidden tunneling region.
  • Determined the binding energy of the He₂ molecule to be [Formula: see text] neV.

Conclusions:

  • Demonstrated a unique quantum system for visualizing universal tunneling behavior.
  • Confirmed the exponential decay of particle density as a fundamental aspect of quantum tunneling.
  • Provided experimental validation for theoretical calculations of He₂ binding energy.