Prominent higher-order contributions to electronic recombination

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 gr...

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Bibliographic Details
Published in:Physical review letters 2011-09, Vol.107 (14), p.143201, Article 143201
Main Authors: Beilmann, C, Mokler, P H, Bernitt, S, Keitel, C H, Ullrich, J, López-Urrutia, J R Crespo, Harman, Z
Format: Article
Language:English
Subjects:
70 PLASMA PHYSICS AND FUSION TECHNOLOGY
APPROXIMATIONS
ARGON IONS
ATOMIC AND MOLECULAR PHYSICS
ATOMIC NUMBER
CALCULATION METHODS
CAPTURE
CHARGED PARTICLES
CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS
DIFFERENTIAL EQUATIONS
DIRAC EQUATION
ELECTRONIC STRUCTURE
ELECTRONS
ELEMENTARY PARTICLES
ENERGY-LEVEL TRANSITIONS
EQUATIONS
EXCITATION
FERMIONS
FIELD EQUATIONS
HARTREE-FOCK METHOD
IONS
IRON IONS
K SHELL
KRYPTON IONS
L SHELL
LEPTONS
PARTIAL DIFFERENTIAL EQUATIONS
RECOMBINATION
RESONANCE
WAVE EQUATIONS
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Summary: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.
ISSN:0031-9007
1079-7114
DOI:10.1103/PhysRevLett.107.143201