Double excitation of helium by fast electrons, protons, andions
- 15 May 1989
- journal article
- research article
- Published by American Physical Society (APS) in Physical Review Letters
- Vol. 62 (20) , 2373-2376
- https://doi.org/10.1103/physrevlett.62.2373
Abstract
The electron emission yield from the doubly excited {(2 D+(2s2pP} states in He excited by impact of fast equivelocity electrons, protons, and carbon ions (charge state 4–6) has been measured at the reduced energy of 1.84 MeV/amu. The data constitute a challenge to the recently proposed models that incorporate electron-correlation effects in atomic collisions.
Keywords
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