The emission of energetic electrons from atoms by fast ions considered as a chargetransfer process
Abstract
The ejection of energetic electrons from atoms by fast ions is described using as final electron states the continuum orbitals in the field of the projectile. The electronic distribution in the firstorder Born approximation is equal to the distribution for direct ionisation where the final electron state is described by a plane wave times the Coulomb factor centred on the projectile. In the secondorder Born approximation the distribution of ejected electrons is significantly decreased, and it is shown that it is equivalent to the correct distribution for direct ionisation in first order times the Coulomb factor around the projectile. For the case of ejected electrons with negligible momentum in the frame of the projectile, it is shown that the electron distribution centered on the projectile is isotropic to order v to the 12th, while the double scattering term in v to the 11th depends on the direction of motion of the electron.
 Publication:

Journal of Physics B Atomic Molecular Physics
 Pub Date:
 March 1980
 DOI:
 10.1088/00223700/13/6/024
 Bibcode:
 1980JPhB...13.1195M
 Keywords:

 Atomic Structure;
 Charge Transfer;
 Electron Emission;
 ElectronIon Recombination;
 High Energy Electrons;
 Born Approximation;
 Charge Exchange;
 Coulomb Collisions;
 Electron Distribution;
 Electron States;
 Atomic and Molecular Physics