Abstract
We present theoretical fully differential cross sections (FDCS) for double ionization of helium by 500 eV and 2 keV electron impact. Contributions from various reaction mechanisms to the FDCS were calculated separately and compared to experimental data. Our theoretical methods are based on the first Born approximation. Higher-order effects are incorporated using the Monte Carlo event generator technique. Earlier, we successfully applied this approach to double ionization by ion impact, and in the work reported here it is extended to electron impact. We demonstrate that at 500 eV impact energy, double ionization is dominated by higher-order mechanisms. Even at 2 keV, double ionization does not predominantly proceed through a pure first-order process.
| Original language | American English |
|---|---|
| Article number | 042039 |
| Journal | Physical Review A - Atomic, Molecular, and Optical Physics |
| Volume | 82 |
| DOIs | |
| State | Published - Dec 1 2010 |
| Event | 27th International Conference on Photonic, Electronic and Atomic Collisions, ICPEAC 2011 - Belfast, United Kingdom Duration: Jul 27 2011 → Aug 2 2011 |
ASJC Scopus Subject Areas
- General Physics and Astronomy
Keywords
- Born approximation
- Double ionization
- Electron impact
- Experimental data
- First Born approximation
- First-order process
- Fully differential cross sections
- Helium
- High energy physics
- Higher order
- Impact energy
- Impact ionization
- Ion bombardment
- Ion impact
- Monte Carlo Event generators
- Monte Carlo methods
- Reaction dynamics
- Reaction mechanism
Disciplines
- Physics
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