We report an (e,2e) study on simultaneous ionization-excitation processes of He and H2 at large momentum transfer. The symmetric noncoplanar (e,2e) cross sections have been measured for transitions to excited ion states. It has been found that noticeable higher-order effects are involved even at the rather high impact energies employed, which ranged between 1.2 and 4.3 keV. Second Born approximation calculations satisfactorily account for the experimental results, indicating that the second-order two-step mechanisms serve as a key to understanding the ionization-excitation dynamics. Roles of the two-step mechanisms will be fully discussed.
|Journal||Journal of Physics: Conference Series|
|Publication status||Published - 2009 Dec 24|
|Event||26th International Conference on Photonic, Electronic and Atomic Collisions - Kalamazoo, United States|
Duration: 2009 Jul 22 → 2009 Jul 28
ASJC Scopus subject areas
- Physics and Astronomy(all)