Storage-ring measurement and multiconfiguration Dirac-Fock calculations

Abstract

The electron-ion recombination rate coefficient for Si IV forming Si III was measured at the heavyion storage-ring TSR. The experimental electron-ion collision energy range of 0–186 eV encompassed the 2p nl n′l′ dielectronic recombination (DR) resonances associated with 3s→ nl core excitations, 2s 2p 3s nl n′l′ resonances associated with 2s → nl (n = 3, 4) core excitations, and 2p 3s nl n′l′ resonances associated with 2p → nl (n = 3, . . . ,∞) core excitations. The experimental DR results are compared with theoretical calculations using the multiconfiguration Dirac-Fock (MCDF) method for DR via the 3s→ 3p n′l′ and 3s→ 3dn′l′ (both n′ = 3, . . . , 6) and 2p 3s 3l n′l′ (n′ = 3, 4) capture channels. Finally, the experimental and theoretical plasma DR rate coefficients for Si IV forming Si III are derived and compared with previously available results.

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Cite this paper

@inproceedings{Schmidt2008StorageringMA, title={Storage-ring measurement and multiconfiguration Dirac-Fock calculations}, author={Eike Schmidt and Debra Bernhardt and Achim M{\"{u}ller and Stefan Schippers and S. Fritzsche and J. Hoffmann and A. S. Jaroshevich and Claude Krantz and Michael Lestinsky and Dmitry A. Orlov and Audrey Wolf and Daniel Wolf Savin}, year={2008} }