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Related Experiment Videos

Three-body contribution to the helium interaction potential.

Wojciech Cencek1, Małgorzata Jeziorska, Omololu Akin-Ojo

  • 1Department of Physics and Astronomy, University of Delaware, Newark, Delaware 19716, USA.

The Journal of Physical Chemistry. A
|June 28, 2007
PubMed
Summary
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Researchers developed two advanced analytic potentials for helium three-body interactions. These potentials, derived from symmetry-adapted perturbation theory (SAPT) and coupled-cluster theory [CCSD(T)], show excellent agreement and improve understanding of helium interactions.

Area of Science:

  • Quantum Chemistry
  • Atomic and Molecular Physics
  • Intermolecular Forces

Background:

  • Accurate potentials are crucial for understanding helium properties.
  • Nonadditive three-body interactions significantly influence condensed helium phases.

Purpose of the Study:

  • To develop accurate analytic three-body potentials for helium.
  • To compare potentials derived from different high-level quantum chemical methods.

Main Methods:

  • Symmetry-adapted perturbation theory (SAPT) for three-body interactions.
  • Supermolecular coupled-cluster theory [CCSD(T)] with large basis sets.
  • Fitting interaction potentials using exponential and damped inverse power functions.

Main Results:

Related Experiment Videos

  • Two analytic three-body potentials for helium were generated.
  • The SAPT and CCSD(T) potentials show close agreement.
  • Largest uncertainties are estimated at 10 mK or 10% at the trimer's minimum configuration.

Conclusions:

  • The developed potentials provide a reliable description of nonadditive three-body helium interactions.
  • Uncertainties are comparable to those of two-body potentials, enabling more accurate simulations.
  • These potentials advance the study of condensed helium systems.