Abstract
Double-electron excitations in electron collisions with are investigated in the range of the outer valence and inner valence excitations by means of angle-resolved electron-photon coincidence measurements. Double-electron and single-electron excitations are termed double and single excitations, respectively, in this article. It is found that the dissociative double excitation resulting in formation becomes more dominant over the dissociative single excitation at 100-eV incident energy as the electron scattering angle increases just from to . This remarkable domination is not expected from the independent particle model and strongly supports the double-excitation mechanism through the electron correlation induced by the penetration of the incident electron depth into the valence orbitals of a molecule.
- Received 26 September 2016
- Revised 23 March 2017
DOI:https://doi.org/10.1103/PhysRevA.96.012706
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