title: Influence of magnetic fields on electron-Ion recombination at very low energies
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.
authors.affiliation: Max-Planck-Institut fur Kernphysik, 69117 Heidelberg, Germany.
authors.initials: G
authors.lastname: Gwinner
authors.initials: A
authors.lastname: Hoffknecht
authors.initials: T
authors.lastname: Bartsch
authors.initials: M
authors.lastname: Beutelspacher
authors.initials: N
authors.lastname: Eklow
authors.initials: P
authors.lastname: Glans
authors.initials: M
authors.lastname: Grieser
authors.initials: S
authors.lastname: Krohn
authors.initials: E
authors.lastname: Lindroth
authors.initials: A
authors.lastname: Muller
authors.initials: AA
authors.lastname: Saghiri
authors.initials: S
authors.lastname: Schippers
authors.initials: U
authors.lastname: Schramm
authors.initials: D
authors.lastname: Schwalm
authors.initials: M
authors.lastname: Tokman
authors.initials: G
authors.lastname: Wissler
authors.initials: A
authors.lastname: Wolf