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Influence of magnetic fields on electron-Ion recombination at very low energies 2000

Gwinner, and Hoffknecht, and Bartsch, and Beutelspacher, and Eklow, and Glans, and Grieser, and Krohn, and Lindroth, and Muller, and Saghiri, and Schippers, and Schramm, and Schwalm, and Tokman, and Wissler, and Wolf
Max-Planck-Institut fur Kernphysik, 69117 Heidelberg, Germany.

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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