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Related papers: Parameterization of the level-resolved radiative r…

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We have calculated partial final-state resolved radiative recombination (RR) rate coefficients from the initial ground and metastable levels of all elements up to and including Zn, plus Kr, Mo, and Xe, for all isoelectronic sequences up to…

Astrophysics · Physics 2009-11-11 N. R. Badnell

We present new calculations and analytic fits to the rates of radiative recombination towards H-like, He-like, Li-like and Na-like ions of all elements from H through Zn (Z=30). The fits are valid over a wide range of temperature, from 3 K…

Astrophysics · Physics 2009-10-28 D. A. Verner , G. J. Ferland

For photoionized plasmas, electron energy-loss rates due to radiative recombination (RR) are required for thermal equilib- rium calculations, which assume a local balance between the energy gain and loss. While many calculations of total…

High Energy Astrophysical Phenomena · Physics 2017-02-22 Junjie Mao , Jelle Kaastra , N. R. Badnell

The first complete set of unified cross sections and rate coefficients are calculated for photoionization and recombination of He- and Li-like ions using the relativistic Breit-Pauli R-matrix method. We present total, unified (e + ion)…

Astrophysics · Physics 2016-08-30 Sultana N. Nahar , Anil K. Pradhan , Hong Lin Zhang

Photoionization and recombination cross sections and rate coefficients are calculated for Li-like Fe XXIV and He-like Fe XXV using the Breit-Pauli R-matrix (BPRM) method. A complete set of total and level-specific parameters is obtained to…

Astrophysics · Physics 2009-10-31 Sultana N. Nahar , Anil K. Pradhan , Hong Lin Zhang

We calculate the recombination spectra of the He-like ions He~I, C~V, N~VI, O~VII, Ne~IX, Mg~XI, Si~XIII, S~XV, Ar~XVII, Ca~XIX, and Fe~XXV. We include the following physical processes: radiative recombination, dielectronic recombination,…

Astrophysics · Physics 2009-10-31 M. A. Bautista , T. R. Kallman

Aimed at ionization balance and spectral analysis of UV and X-ray sources, we present self-consistent sets of photoionization cross sections, recombination cross sections, and rate coefficients for Li-like O VI and He-like O VII.…

Astrophysics · Physics 2009-11-07 Sultana N. Nahar , Anil K. Pradhan

We present a theoretical investigation of dielectronic recombination (DR) of Ar-like ions that sheds new light on the behavior of the rate coefficient at low-temperatures where these ions form in photoionized plasmas. We provide results for…

Atomic Physics · Physics 2013-03-13 D. Nikolić , T. W. Gorczyca , K. T. Korista , N. R. Badnell

Reliably interpreting spectra from electron-ionized cosmic plasmas requires accurate ionization balance calculations for the plasma in question. However, much of the atomic data needed for these calculations have not been generated using…

Astrophysics · Physics 2009-11-11 P. Bryans , N. R. Badnell , T. W. Gorczyca , J. M. Laming , W. Mitthumsiri , D. W. Savin

The unified method for total electron-ion recombination is extended to study the dielectronic satellite (DES) lines. These lines, formed from radiative decay of autoionizing states, are highly sensitive temperature diagnostics of…

Astrophysics · Physics 2015-05-13 S. N. Nahar , J. Oelgoetz , A. K. Pradhan

Photoionization cross sections and recombination rate coefficients are presented for the L-shell ground state fine structure levels $2s^22p^4 \ ^3P_{2,0,1}$ of Fe~XIX. Several sets of calculations including relativistic effects are carried…

Astrophysics · Physics 2009-10-31 Hong Lin Zhang , Anil K. Pradhan

The inverse processes of photoionization and electron-ion recombination of (hnu + Ni XXVI --> Ni XXVII + e and (hnu + Ni XXVII --> Ni XXVIII + e) are studied using the unified method for the total recombination. The method subsumes both the…

Astrophysics · Physics 2009-11-10 Sultana N. Nahar

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.…

We present the first detailed ab initio quantum mechanical calculations for total and state-specific recombination rate coefficients for e + Ni III --> Ni II. These rates are obtained using a unified treatment for total electron-ion…

Astrophysics · Physics 2009-11-06 Sultana N. Nahar , Manuel A. Bautista

Unified recombination cross sections and rates are computed for (e + Fe XVIII) --> Fe XVII including non-resonant and resonant (radiative and di-electronic recombination, RR and DR) processes in an ab initio manner with relativistic fine…

Astrophysics · Physics 2009-10-31 Anil K. Pradhan , Sultana N. Nahar , Hong Lin Zhang

We survey the results of a long-term study of the process of radiative recombination. A rigorous theory of nonrelativistic electron radiative recombination with a hydrogen-like ion is used to calculate the total cross section of the…

Atomic Physics · Physics 2019-03-27 Igor A. Kotelnikov , Alexander I. Milstein

Here we report new ${\it ab initio}$ calculations of the effective recombination coefficients for the \ion{N}{ii} recombination spectrum. We have taken into account the density dependence of the coefficients arising from the relative…

Solar and Stellar Astrophysics · Physics 2015-05-27 X. Fang , P. J. Storey , X. -W. Liu

We investigate the effect of resonances in photoionization and recombination cross sections computed using the R-matrix method. Photoionization and recombination rates derived from high-resolution cross sections for oxygen ions are compared…

Astrophysics · Physics 2009-11-10 Franck Delahaye , Sultana N. Nahar , Anil K Pradhan , Hong Lin Zhang

The line ratios R and G of the three main lines of He-like ions (triplet: resonance, intercombination, forbidden lines) are calculated for CV, NVI, OVII, NeIX, MgXI, and SiXIII. These ratios can be used to derive electron density n_e and…

Astrophysics · Physics 2016-08-30 D. Porquet , R. Mewe , J. Dubau , A. J. J. Raassen , J. S. Kaastra

The dielectronic recombination rate coefficients of N V and Ne VIII ions have been measured at a heavy-ion storage ring. The investigated energy ranges covered all dielectronic recombination resonances attached to 2s -> 2p (Delta n=0) core…

Astrophysics · Physics 2009-11-10 S. Boehm , A. Mueller , S. Schippers , W. Shi , M. Fogle , P. Glans , R. Schuch , H. Danared
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