title: Prominent higher-order contributions to electronic recombination.
abstract: Intershell higher-order (HO) electronic recombination is reported for highly charged Ar, Fe, and Kr ions, where simultaneous excitation of one K-shell electron and one or two additional L-shell electrons occurs upon resonant capture of a free electron. For the mid-Z region, HO resonance strengths grow unexpectedly strong with decreasing atomic number Z (∝Z(-4)), such that, for Ar ions the 2nd-order overwhelms the 1st-order resonant recombination considerably. The experimental findings are confirmed by multiconfiguration Dirac-Fock calculations including hitherto neglected excitation pathways.
authors: Max-Planck-Institut für Kernphysik, Saupfercheckweg 1, 69117 Heidelberg, Germany.
authors: C
authors: C
authors: Beilmann
authors: P H
authors: PH
authors: Mokler
authors: S
authors: S
authors: Bernitt
authors: C H
authors: CH
authors: Keitel
authors: J
authors: J
authors: Ullrich
authors: J R Crespo
authors: JR
authors: López-Urrutia
authors: Z
authors: Z
authors: Harman