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24 April 2024

» arxiv » 1511.2013

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Absolute rate coefficients for photorecombination of berylliumlike and boronlike silicon ions
D. Bernhardt ; A. Becker ; C. Brandau ; M. Grieser ; M. Hahn ; C. Krantz ; M. Lestinsky ; O. Novotný ; R. Repnow ; D. W. Savin ; K. Spruck ; A. Wolf ; A. Müller ; S. Schippers ;
Date:	6 Nov 2015
Abstract:	We report measured rate coefficients for electron-ion recombination for Si10+ forming Si9+ and for Si9+ forming Si8+, respectively. The measurements were performed using the electron-ion merged-beams technique at a heavy-ion storage ring. Electron-ion collision energies ranged from 0 to 50 eV for Si9+ and from 0 to 2000 eV for Si10+, thus, extending previous measurements for Si10+ [Orban et al. 2010, Astrophys. J. 721, 1603] to much higher energies. Experimentally derived rate coefficients for the recombination of Si9+ and Si10+ ions in a plasma are presented along with simple parameterizations. These rate coefficients are useful for the modeling of the charge balance of silicon in photoionized plasmas (Si9+ and Si10+) and in collisionally ionized plasmas (Si10+ only). In the corresponding temperature ranges, the experimentally derived rate coefficients agree with the latest corresponding theoretical results within the experimental uncertainties.
Source:	arXiv, 1511.2013
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