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Related Experiment Videos

Threshold behavior of e-H ionizing collisions.

Philip L Bartlett1, Andris T Stelbovics

  • 1Centre for Atomic, Molecular and Surface Physics, Murdoch University, Perth 6150, Australia. bartlett@fizzy.murdoch.edu.au

Physical Review Letters
|December 17, 2004
PubMed
Summary

Accurate calculations of electron-impact ionization in hydrogen near threshold support the Wannier law. The study precisely determines the ionization cross-section and electron angular distribution energy dependence.

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Threshold electron-impact ionization mechanism for hydrogen atoms.

Physical review letters·2006
See all related articles

Area of Science:

  • Atomic and Molecular Physics
  • Quantum Mechanics
  • Chemical Physics

Background:

  • Electron-impact ionization is fundamental to understanding atomic processes.
  • Accurate theoretical predictions are crucial for validating physical laws near ionization thresholds.

Purpose of the Study:

  • To provide accurate ab initio numerical solutions for electron-impact ionization of hydrogen.
  • To test the validity of the Wannier threshold law and classical/semiclassical predictions.

Main Methods:

  • Solving the full Schrödinger equation using the propagating exterior complex scaling method.
  • Performing accurate ab initio numerical calculations.

Main Results:

  • Strong support for the Wannier threshold law, with the cross-section (sigma) proportional to E(1.122+/-0.015).
  • Determined the energy dependence of the electrons' angular distribution as (pi-theta12) FWHM approximately 3.0E(1/4).

Conclusions:

  • The results validate the Wannier threshold law for electron-impact ionization of hydrogen.
  • The findings align with classical and semiclassical predictions for electron angular distributions.

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