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Monocentric close-coupling expansion to provide ejected electron distributions for ionization In atomic collisions

Pons1

  • 1Centre Lasers Intenses et Applications, UMR 5107 du CNRS,Universite de Bordeaux-I, 351 Cours de la Liberation, F-33405 Talence, France.

Physical Review Letters
|September 16, 2000
PubMed
Summary

A new close-coupling expansion method accurately calculates positron-hydrogen collisions. It provides reliable ejected electron distributions, confirming previous classical descriptions for atomic physics research.

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Area of Science:

  • Atomic and Molecular Physics
  • Quantum Mechanics
  • Computational Physics

Background:

  • Positron-atom collisions are fundamental in understanding matter-antimatter interactions.
  • Accurate theoretical methods are crucial for interpreting experimental results in atomic collisions.

Purpose of the Study:

  • To introduce and apply a novel monocentric close-coupling expansion method.
  • To calculate total ionization cross sections for positron-hydrogen collisions.
  • To obtain reliable ejected electron distributions, extending beyond standard close-coupling capabilities.

Main Methods:

  • A new monocentric close-coupling expansion was developed.
  • The expansion utilizes spherical Bessel functions confined within a finite box.
  • The method was implemented for positron-hydrogen (e+H(1s)) collisions.

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Main Results:

  • The method successfully calculated total ionization cross sections.
  • Reliable ejected electron distributions were obtained.
  • The results align with and support recent classical descriptions of these collisions.

Conclusions:

  • The presented close-coupling expansion is a viable and effective method for studying positron-atom collisions.
  • This approach provides valuable insights into ejected electron dynamics, a key aspect of ionization processes.
  • The findings validate and extend previous theoretical models in the field.