Acceleration effects in slow ion-atom collisions from a first-principles dynamics

B. Thorndyke, D. A. Micha, K. Runge

Research output: Contribution to journalArticlepeer-review

3 Scopus citations


Slow ion-atom collisions can be described within a first-principles molecular dynamics based on eikonal wave functions for the nuclei and the time- dependent Hartree-Fock (TDHF) approximation for electrons that self-consistently couples the electronic and nuclear degrees of freedom. By expanding the molecular Orbitals in traveling atomic orbitals containing electron translation factors, it is possible to eliminate spurious couplings between same-center orbitals at asymptotic distances, and this generates a term in the density matrix equations proportional to the nuclear accelerations. We examine the effect of this acceleration term on Löwdin atomic populations for H+ + H(1s) and He2+ + H(1s) collisions, for varying collision energies and impact parameters. We find significant increases in atomic populations for an intermediate range of energies going from several tens to several hundreds of electron volts, and for low impact parameters, in the case of the H+ + H(1s) collision.

Original languageEnglish (US)
Pages (from-to)361-366
Number of pages6
JournalInternational Journal of Quantum Chemistry
Issue number4-5
StatePublished - 1999


  • Density matrix
  • Quantum molecular dynamics
  • Time-dependent Hartree-Fock

ASJC Scopus subject areas

  • Atomic and Molecular Physics, and Optics
  • Condensed Matter Physics
  • Physical and Theoretical Chemistry


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