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Recombination rate coefficients of Be-like Si
Stockholm University, Faculty of Science, Department of Physics.
Department of Physics, Auburn University, Auburn, 36849 Alabama, USA.
Stockholm University, Faculty of Science, Department of Physics.
Stockholm University, Faculty of Science, Department of Physics.
2010 (English)In: Astrophysical Journal, ISSN 0004-637X, E-ISSN 1538-4357, Vol. 721, no 2, 1603-1607 p.Article in journal (Refereed) Published
Abstract [en]

Recombination rate coefficients for Be-like Si10+ recombining into B-like Si9+ are derived froma measurement at an electron cooler device. The recombination spectrum shows strong contributionsfrom trielectronic recombination. Below 100 meV several very strong resonances associatedwith a spin-flip of the excited electron dominate the spectrum and also dominate thelow-temperature plasma recombination rate coefficents. Calculated rate coefficients are used toestimate the metastable fraction of the ion beam in the experiment and are also used to estimatethe amount of recombined ions that were not detected in the experiment, because of fieldionization. The resonant plasma rate coefficients corrected for the experimental field ionizationare in good agreement with calculated results by Gu (2003) and with AUTOSTRUCTURE calculations.All other calculations significantly underestimate the plasma rate coefficients at lowtemperatures.

Place, publisher, year, edition, pages
2010. Vol. 721, no 2, 1603-1607 p.
Keyword [en]
atomic data, atomic processes, plasmas
National Category
Physical Sciences
Identifiers
URN: urn:nbn:se:su:diva-33248DOI: 10.1088/0004-637X/721/2/1603OAI: oai:DiVA.org:su-33248DiVA: diva2:282768
Available from: 2009-12-21 Created: 2009-12-21 Last updated: 2017-12-12Bibliographically approved
In thesis
1. Electron - Ion Recombination Studies of Astrophysically Relevant Ions: Storage Ring and Electron Beam Ion Trap Based Measurements
Open this publication in new window or tab >>Electron - Ion Recombination Studies of Astrophysically Relevant Ions: Storage Ring and Electron Beam Ion Trap Based Measurements
2009 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

This thesis contains experimental work that was performed at two state-of-the art devices for electron-ion collision physics, at a heavy-ion storage ring and at an Electron Beam Ion Trap. As a result, absolute recombination rate coefficients for H-like Si, He-like Si, Be-like Si, and Na-like Si, as well as Be-like Ne, Na-like S and Na-like Ar are reported over a wide energy range from μeV to keV. The experimentally derived recombination spectra are compared with results of Many Body Perturbation Theory calculations and AUTOSTRUCTURE calculations. Furthermore, the effect of external electric fields on the recombination rate is investigated for two Na-like ions, and a strong enhancement of dielectronic recombination into high Rydberg states is observed. Experimental plasma rate coefficients are derived for the studied ions for the first time and are compared with calculated values available in the literature. In the EBIT experiment, a novel extraction method provides complete charge state spectra of the ions for every extraction. Absolute DR rate coefficients for both H-like Si and He-like Si are obtained from the same measurement. Comparison with recorded X-ray spectra enables the separation of the photon spectra arising from charge-changing and charge-preserving reactions and facilitates the extraction of electron impact excitation rate coefficients.

Place, publisher, year, edition, pages
Stockholm: Department of Physics, Stockholm University, 2009. 150 p.
Keyword
atomic processes, electron-ion recombination, plasma
National Category
Physical Sciences
Research subject
Physics
Identifiers
urn:nbn:se:su:diva-33254 (URN)978-91-7155-989-0 (ISBN)
Public defence
2010-01-29, sal FB42, AlbaNova universitetscentrum, Roslagstullsbacken 21, Stockholm, 14:30 (English)
Opponent
Supervisors
Note
At the time of the doctoral defense, the following papers were unpublished and had a status as follows: Paper 6: Submitted. Paper 7: Submitted. Available from: 2010-01-07 Created: 2009-12-21 Last updated: 2010-01-08Bibliographically approved

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