Electron Ionization Cross Sections in the Distorted-Wave Approximation.
Abstract
Eight different modifications (A1-A8) of the distorted-wave approximation for the calculation of electron ionization cross sections are introduced and results are compared with other theoretical methods and experiment. Non-exchange approximations (A1-A4) are characterized by different orthogonal properties of wave functions and by different choices of asymptotic charges for the ejected electron. Results of these approximations are compared for H, He, He(+), Li(+), and Mg(+). The best approximation (A4) is then used for more complex atomic systems such as Li, C(+3), C(+), N(+), O(+), O, Ne(+), Na(+), and K(+). A4 generally agrees better with experiment than the Born or Coulomb-Born approximation. Exchange approximations (A5-A8) are characterized by different choices of asymptotic charges in the exchange amplitude. These approximations have been tested on hydrogen and although a slight improvement over the non-exchange approximations has been obtained in the case of A5, the difference does not appear to be too significant.
Document Details
- Document Type
- Technical Report
- Publication Date
- Jun 18, 1980
- Accession Number
- ADA087210
Entities
People
- Jack F. Davis
- M. Blaha
Organizations
- United States Naval Research Laboratory