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Dielectronic recombination resonances in Na8+
Stockholm University, Faculty of Science, Department of Physics.
Stockholm University, Faculty of Science, Department of Physics.
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2004 (English)In: Physical Review A. Atomic, Molecular, and Optical Physics, ISSN 1050-2947, E-ISSN 1094-1622, Vol. 70, no 6Article in journal (Refereed) Published
Abstract [en]

The electron-ion recombination spectrum of the Li-like Na8+ ion in the energy range 0.0–0.5 eV is presented. Experimental results obtained by storage-ring techniques are compared with a calculated spectrum, based on a combination of relativistic many-body methods and complex rotation, and the agreement is found to be very good. The deviations between measured and calculated dielectronic recombination resonance energies are usually below about 2 meV with a maximum difference at 5.5 meV, while the theoretical cross sections deviate by at most 20% from the experiment. The recombination spectrum in the investigated energy region is determined by the 2pj7ℓj Rydberg manifold of dielectronic recombination resonances, comprising 61 states within half an eV above the ground state of Na8+. The theoretical resonance parameters of all contributing states are provided.

Place, publisher, year, edition, pages
The American Physical Society , 2004. Vol. 70, no 6
National Category
Physical Sciences
Identifiers
URN: urn:nbn:se:su:diva-23113DOI: 10.1103/PhysRevA.70.062723OAI: oai:DiVA.org:su-23113DiVA: diva2:190198
Note
Part of urn:nbn:se:su:diva-152Available from: 2004-05-13 Created: 2004-05-13 Last updated: 2017-12-13Bibliographically approved
In thesis
1. Autoionizing states and their relevance in electron-ion recombination
Open this publication in new window or tab >>Autoionizing states and their relevance in electron-ion recombination
2004 (English)Doctoral thesis, comprehensive summary (Other academic)
Alternative title[sr]
Autojonizujuća stanja i njihov značaj u rekombinaciji jona sa elektronima
Abstract [en]

Atomic physics plays an important role in determining the evolution stages in a wide range of laboratory and cosmic plasmas. Therefore, the main contribution to our ability to model, infer and control plasma sources is the knowledge of underlying atomic processes. Of particular importance are reliable low temperature dielectronic recombination (DR) rate coefficients.

This thesis provides systematically calculated DR rate coefficients of lithium-like beryllium and sodium ions via ∆n = 0 doubly excited resonant states. The calculations are based on complex-scaled relativistic many-body perturbation theory in an all-order formulation within the single- and double-excitation coupled-cluster scheme, including radiative corrections.

Comparison of DR resonance parameters (energy levels, autoionization widths, radiative transition probabilities and strengths) between our theoretical predictions and the heavy-ion storage rings experiments (CRYRING-Stockholm and TSRHeidelberg) shows good agreement.

The intruder state problem is a principal obstacle for general application of the coupled-cluster formalism on doubly excited states. Thus, we have developed a technique designed to avoid the intruder state problem. It is based on a convenient partitioning of the Hilbert space and reformulation of the conventional set of pairequations. The general aspects of this development are discussed, and the effectiveness of its numerical implementation (within the non-relativistic framework) is selectively illustrated on autoionizing doubly excited states of helium.

Place, publisher, year, edition, pages
Stockholm: Fysikum, 2004. 67 p.
Keyword
Electron-ion recombination, Autoionization, Electron correlation calculations, Doubly excited states, Relativistic many-body perturbation theory, Coupled-cluster methodology, Intruder state problem
National Category
Physical Sciences
Identifiers
urn:nbn:se:su:diva-152 (URN)91-7265-906-8 (ISBN)
Public defence
2004-06-04, sal FB42, AlbaNova universitetscentrum, Roslagstullsbacken 21, Stockholm, 13:00
Opponent
Supervisors
Available from: 2004-05-13 Created: 2004-05-13Bibliographically approved

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