Electron momentum spectroscopy of H{sub 2} and D{sub 2}: Ionization to ground and excited final states
- Department of Chemistry, The University of British Columbia, 2036 Main Mall, Vancouver, British Columbia, V6T1Z1 (CANADA)
- Department of Chemistry, Indiana University, Bloomington, Indiana 47405 (United States)
The symmetric noncoplanar (e,2e) cross sections (momentum profiles) of H{sub 2} and D{sub 2} for the transitions to the 2p{sigma}{sub u} and 2s{sigma}{sub g} excited ion states have been measured, relative to the ground-state ion transition, using a high-sensitivity multichannel momentum-dispersive electron momentum spectrometer (EMS) at an impact energy of 1200 eV. Newly calculated plane-wave impulse approximation (PWIA) cross sections, based on a full-configuration-interaction H{sub 2} wave function, are compared to the experimental results. These calculations are in better agreement with the experimental results for the transition to the 2s{sigma}{sub g} ion state than the earlier theoretical work of Liu and Smith, Jr. [Phys. Rev. A {bold 31}, 3003 (1985)] which has been found to be in error. Nevertheless, significant discrepancies between the relative experimental and theoretical cross sections are observed for the transitions to excited ion states, suggesting a failure of the PWIA description of these processes. The results are supported by additional measurements obtained using an energy-dispersive EMS spectrometer. {copyright} {ital 1997} {ital The American Physical Society}
- OSTI ID:
- 528051
- Journal Information:
- Physical Review A, Journal Name: Physical Review A Journal Issue: 2 Vol. 56; ISSN 1050-2947; ISSN PLRAAN
- Country of Publication:
- United States
- Language:
- English
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