Berlin 2001 – wissenschaftliches Programm
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A: Atomphysik
A 19: Electrons, incl. Scattering and Recombination
A 19.11: Vortrag
Freitag, 6. April 2001, 18:15–18:30, H1028
Measurement of Superelastically Scattered Electrons in Metastable O6+, C4+ + H2 Collisions — •A. L. Landers1, A.S. Al-Naser1, H. Knutson2, D.J. Pole1, T. W. Gorczyca 1, and J.A. Tanis1 — 1Western Michigan University, Kalamazoo, Michigan, USA 49008 — 2Kalamazoo Area Math and Science Center, Kalamazoo, Michigan, USA 49008
We have measured the scattering of quasi-free target electrons by metastable He-like oxygen ions. The objective is to study the mechanism by which an excited ion can transfer its energy to a scattering electron. In this case, the reaction is simply a temporally reversed inelastic excitation process. We have measured electrons scattered by the 1s2s 3S metastable component of a 1.1 MeV/u O6+ and 0.6 MeV/u C4+ ions produced by the Western Michigan University tandem Van de Graaff accelerator. A loosely bound electron from the hydrogen target scatters from the projectile ion at zero degrees in the laboratory frame. Electrons which gain energy from the de-excitation of a metastable projectile manifest themselves in a broad peak in the electron spectrum consistent with the energy gain from the de-excitation of the metastable ion. This reaction is under further investigation encompassing other ion species and energies and comparing these results to R-matrix electron scattering calculations.