Hydrogen molecule-antihydrogen atom potential energy surface and scattering calculations

B P Mant, M M Law (Corresponding Author), K Strasburger

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Abstract

We have calculated ground state interaction energies for an antihydrogen atom and a hydrogen molecule within the Born-Oppenheimer approximation. Leptonic energies were calculated using a large basis set of explicitly correlated Gaussian functions. Energies were calculated at over 2800 geometries including different proton-proton distances. The energies have been fit to functional forms using a neural network for the short-range interaction which is combined with asymptotic formulas at long range. A two-dimensional rigid rotor and a three-dimensional atom-molecule potential energy surface (PES) have been determined. Rigid-rotor scattering calculations on these surfaces have been carried out using the S-matrix Kohn variational method with a two-dimensional Gaussian basis set. We have calculated cross sections for elastic, rotationally inelastic and annihilation collisions on the two-dimensional PES. This includes the first calculation of leptonic annihilation for this system.

Original languageEnglish
Article number185201
JournalJournal of Physics B: Atomic and Molecular Physics
Volume52
Issue number18
Early online date23 Aug 2019
DOIs
Publication statusPublished - 28 Sep 2019

Keywords

  • antihydrogen
  • matter-antimatter interactions
  • low energy scattering
  • potential energy surface
  • elastic scattering
  • inelastic scattering
  • annihilation
  • CORRELATED GAUSSIAN FUNCTIONS
  • S-MATRIX VERSION
  • VARIATIONAL CALCULATIONS
  • TRIATOMIC-MOLECULES
  • GROUND-STATE
  • HE
  • DYNAMICS
  • SYSTEMS
  • CHARGE

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