Title | Electron momentum spectroscopy experiments and calculations for the production of excited states of He+ and H-2(+) |
Publication Type | Journal Article |
Year of Publication | 1996 |
Authors | Lermer, N, Todd, BR, Cann, NM, Brion, CE, Zheng, Y, Chakravorty, S, Davidson, ER |
Journal | CANADIAN JOURNAL OF PHYSICS |
Volume | 74 |
Pagination | 748-756 |
Date Published | NOV-DEC |
ISSN | 0008-4204 |
Abstract | The (e,2e) cross-section for transitions to the n = 2 final state of He+ and the 2s sigma, final state of H-2(+) have been measured, relative to thr cross-section for the transitions to the respective ground state ions, using a highly sensitive momentum dispersive multichannel electron momentum spectrometer. The experimental results for He are compared with plane wave impulse approximation (PWIA) cross-section calculations carried out using two previously published CI wavefunctions and also with two cross-section calculations based on explicitly correlated wavefunctions with energy errors of less than 10 nHartree. The H-2 results an compared with calculations by J.W. Liu and V.H. Smith Jr. (Phys. Rev. A, 31, 3003 (1985); erratum: Phys. Rev. A, 39, 3703 (1989)). For both He and H-2, significant differences are observed between the measured relative cross-sections and those calculated using the PWIA. While the measurements for He differ from previous work, the results for H-2 are consistent with some earlier measurements. |
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