Relativistic fine structure and resonance effects in electron-ion recombination and excitation of (e + C IV)

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dc.creatorPradhan, Anil K.
dc.creatorChen, Guo Xin
dc.creatorNahar, Sultana N.
dc.creatorZhang, Hong Lin
dc.date2001-05-25
dc.date2001-08-28
dc.date.accessioned2026-07-07T12:00:46Z
dc.date.available2026-07-07T12:00:46Z
dc.descriptionRelativistic close coupling calculations are reported for unified electronic recombination of (e + C IV) including non-resonant and resonant recombination processes, radiative and dielectronic recombination (RR and DR). Detailed comparison of the theoretical unified results with two recent experiments on ion storage rings (Mannervik etal. [1] and Schippers etal. [2]) shows very good agreement in the entire measured energy region 2s -- 2p with 2pnl resonances. The results benchmark theory and experiments to uncertainties of ~15%, and show that the resonant and the background cross sections are not an incoherent sum of separate RR and DR contributions. The limiting values of the DR cross sections, as n ---> infinity, are shown to correspond to those due to electron impact excitation (EIE) at the 2Po_(1/2,3/2) fine structure thresholds, delineated for the first time. The near-threshold 2s 2S_(1/2) - 2p 2Po_(1/2,3/2) EIE cross sections are also compared with recent experimental measurements. The demonstrated threshold fine structure and resonance effects should be of general importance in excitation and recombination of positive ions.
dc.description7 pages, 3 figures; accepted in Phys. Rev. Letters, no change from submitted version
dc.identifierhttps://arxiv.org/abs/astro-ph/0105459
dc.identifierhttp://arxiv.org/abs/astro-ph/0105459
dc.identifierPhys.Rev.Lett.87:183201,2001
dc.identifierdoi:10.1103/PhysRevLett.87.183201
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/206895
dc.subjectAstrophysics
dc.subjectAtomic Physics
dc.titleRelativistic fine structure and resonance effects in electron-ion recombination and excitation of (e + C IV)
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