Hartree-Fock treatment of exchange in (e, 2e) collisions
Abbreviated Journal Title
J. Phys. B-At. Mol. Opt. Phys.
ELECTRON-IMPACT IONIZATION; COPLANAR SYMMETRICAL GEOMETRY; SPIN-POLARIZED ELECTRONS; E, 2E COLLISIONS; INTERMEDIATE ENERGIES; CROSS-SECTIONS; SCATTERING; ATOMS; XENON; ARGON; Optics; Physics, Atomic, Molecular & Chemical
The distorted-wave Born approximation has been very successful for treating electron-impact ionization (e, 2e) of heavy atoms for high-energy incident electrons. However, as the energy of the incident electrons approaches threshold, significant differences between experiment and theory are observed. In these calculations, the continuum projectile electron wavefunction is typically calculated using the static field of the atom plus a local approximation for electron exchange. While this approximation is believed to be reasonable for higher energies, it is likely to become unreliable for energies near threshold. Here we report a proper treatment of electron exchange in which a full Hartree-Fock calculation is performed for both the atomic and projectile electrons. For the initial stare, the projectile orbitals are calculated in the Hartree-Fock approximation with full exchange with the target electrons and for the final state, the Hartree-Fock continuum orbitals are computed for an ion. It is found that the static-exchange approximation is not valid for lower incident energy projectiles.
Journal of Physics B-Atomic Molecular and Optical Physics
"Hartree-Fock treatment of exchange in (e, 2e) collisions" (1999). Faculty Bibliography 1990s. 2901.