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          Institute: MPI für Kernphysik     Collection: Spectroscopy and Dynamics of Trapped and Stored Ions     Display Documents

ID: 31847.0, MPI für Kernphysik / Spectroscopy and Dynamics of Trapped and Stored Ions
Interference effects in the photorecombination of argonlike Sc3+ ions: Storage-ring experiment and theory
Authors:Schippers, S.; Kieslich, S.; Muller, A.; Gwinner, G.; Schnell, M.; Wolf, A.; Covington, A.; Bannister, M. E.; Zhao, L. B.
Date of Publication (YYYY-MM-DD):2002-04
Title of Journal:Physical Review A
Journal Abbrev.:Phys. Rev. A
Issue / Number:4
Start Page:042723
End Page:042723
Sequence Number of Article:042723
Review Status:Peer-review
Audience:Experts Only
Abstract / Description:Absolute total electron-ion recombination rate coefficients of argonlike Sc3+(3s(2)3p(6)) ions have been measured for relative energies between electrons and ions ranging from 0 to 45 eV. This energy range comprises all dielectronic recombination resonances attached to 3p-->3d and 3p-->4s excitations. A broad resonance with an experimental width of 0.89+/-0.07 eV due to the 3p(5)3d(2) F-2 intermediate state is found at 12.31+/-0.03 eV with a small experimental evidence for an asymmetric line shape. From R-matrix and perturbative calculations we infer that the asymmetric line shape may not only be due to quantum- mechanical interference between direct and resonant recombination channels as predicted by Gorczyca [Phys. Rev. A 56, 4742 (1997)], but may be partly also due to the interaction with an adjacent overlapping dielectronic recombination resonance of the same symmetry. The overall agreement between theory and experiment is poor. Differences between our experimental and our theoretical resonance positions are as large as 1.4 eV. This illustrates the difficulty to accurately describe the structure of an atomic system with an open 3d shell with state-of-the-art theoretical methods. Furthermore, we find that a relativistic theoretical treatment of the system under study is mandatory since the existence of experimentally observed strong 3p(5)3d(2) 2D and 3p(5)3d4s D-2 resonances can only be explained when calculations beyond LS coupling are carried out.
External Publication Status:published
Document Type:Article
Affiliations:MPI für Kernphysik/Group D. Schwalm/Atomic and Molecular Physics with Stored Ions (A. Wolf)
External Affiliations:Univ Giessen, Strahlenzentrum, Inst Kernphys, D-35392 Giessen, Germany; Univ Nevada, Dept Phys, Reno, NV 89557, USA; Oak Ridge Natl Lab, Div Phys, Oak Ridge, TN 37831 USA; CCAST, World Lab, Beijing 100080, Peoples R China; Chinese Acad Sci, China Inst Theoret Phys, Beijing 100088, Peoples R China
Identifiers:ISI:000174978600090 [ID No:1]
ISSN:1050-2947 [ID No:2]
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