Unified Electronic Recombination of Ne-like Fe XVII: Implications for Modeling X-Ray Plasmas

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dc.creator Nahar, Sultana Nurun
dc.creator Pradhan, Anil K.
dc.creator Zhang, Hong Lin
dc.date.accessioned 2009-12-28T19:04:48Z
dc.date.available 2009-12-28T19:04:48Z
dc.date.issued 2001-03
dc.identifier.citation Pradhan, Anil K., Nahar, Sultana Nurun, Zhang, Hong Lin. "Unified Electronic Recombination of Ne-like Fe XVII: Implications for Modeling X-Ray Plasmas," The Astrophysical Journal Letters, v. 549, March, 2001, pp. L265-L268. en_US
dc.identifier.issn 2041-8205
dc.identifier.uri http://hdl.handle.net/1811/44603
dc.description Relevant data is available at: http://www.astronomy.ohio-state.edu/~nahar/nahar_radiativeatomicdata/index.html en_US
dc.description.abstract Unified recombination cross sections and rates are computed for (e + Fe XVIII) → Fe XVII including nonresonant and resonant (radiative recombination [RR] and dielectronic recombination [DR]) processes in an ab initio manner with relativistic fine structure. The highly resolved theoretical cross sections exhibit considerably more resonance structures than observed in the heavy-ion storage ring measurements at Heidelberg, Germany. Nonetheless, the detailed resonance complexes agree well with experimental results, and the unified rates agree with the sum of experimentally derived DR and theoretical RR rates to ~20%, within experimental or theoretical uncertainties. Theoretical results may provide estimates of field ionization of Rydberg levels close to the DR peak and nonresonant background contributions particularly close to the RR peak as E → 0. More generally, the unified results avoid the physical and practical problems in astrophysical models inherent in the separation of electronic recombination into RR and DR on the one hand and further subdivision into low-energy Δn = 0 DR and high-energy Δn > 0 DR in photoionized and collisionally ionized X-ray plasmas on the other hand. en_US
dc.description.sponsorship This work was partially supported by the NSF and the NASA Astrophysical Theory Program. en_US
dc.language.iso en_US en_US
dc.rights © 2001. The American Astronomical Society. All rights reserved.
dc.subject atomic data en_US
dc.subject atomic processes en_US
dc.subject line -- formation en_US
dc.subject X-rays -- general
dc.title Unified Electronic Recombination of Ne-like Fe XVII: Implications for Modeling X-Ray Plasmas en_US
dc.type Article en_US
dc.identifier.doi 10.1086/319174
dc.identifier.osuauthor nahar.1
dc.identifier.osuauthor pradhan.1