Gwinner G, Hoffknecht A, Bartsch T, Beutelspacher M, Eklow N, Glans P, Grieser M, Krohn S, Lindroth E, Muller A, Saghiri AA, Schippers S, Schramm U, Schwalm D, Tokman M, Wissler G, Wolf A. Influence of magnetic fields on electron-Ion recombination at very low energies.
Phys Rev Lett 2000;
84:4822-4825. [PMID:
10990807 DOI:
10.1103/physrevlett.84.4822]
[Citation(s) in RCA: 6] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/12/1999] [Indexed: 05/23/2023]
Abstract
Radiative recombination (inverse photoionization) is believed to be well understood since the beginning of quantum mechanics. Still, modern experiments consistently reveal excess recombination rates at very low electron-ion center-of-mass energies. In a detailed study on recombination of F6+ and C6+ ions with magnetically guided electrons we explored the yet unexplained rate enhancement, its dependence on the magnetic field B, the electron density n(e), and the beam temperatures T( perpendicular) and T( ||). The excess scales as T(-1/2)( perpendicular) and, surprisingly, as T(-1/2)( ||), increases strongly with B, and is insensitive to n(e). This puts strong constraints on explanations of the enhancement.
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