(e,2e) ionization-excitation of H{sub 2}
- Institute of Multidisciplinary Research for Advanced Materials, Tohoku University, Sendai 980-8577 (Japan)
Binary (e,2e) measurements are reported for ionization-excitation processes of H{sub 2}. The experiments were performed at impact energies of 1200, 1600, and 2000 eV using an energy- and momentum-dispersive spectrometer. Momentum profiles for transitions to the 2s{sigma}{sub g} and 2p{sigma}{sub u} excited final ion states are presented as normalized intensities relative to the cross section of the primary ionization to the 1s{sigma}{sub g} ground ion state. The results are compared with theoretical calculations of Lermer et al. [Phys. Rev. A 56, 1393 (1997)] using the first-order plane-wave impulse approximation. Certain features of the discrepancies between experiment and theory can be explained by incorporating contributions from the second-order two-step mechanisms into the (e,2e) cross sections. Furthermore, the present results suggest that 2s{sigma}{sub g} and 2p{sigma}{sub u} cross sections approach their high-energy limits in different ways.
- OSTI ID:
- 20640336
- Journal Information:
- Physical Review. A, Journal Name: Physical Review. A Journal Issue: 4 Vol. 68; ISSN 1050-2947; ISSN PLRAAN
- Country of Publication:
- United States
- Language:
- English
Similar Records
POSITRON COLLISIONS WITH HYDROGEN ATOMS
(e,2e) study on distorted-wave and relativistic effects in the inner-shell ionization processes of xenon 4d{sub 5/2} and 4d{sub 3/2}