The influence of autoionization accompanied by excitation on dielectronic recombination and ionization equilibrium

Jacobs, V. L.; Davis, J.; Kepple, P.; Bláha, M.

doi:10.1086/154970

Cited by 228 publications

(137 citation statements)

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“…Surprisingly, this procedure gives results that are in fair agreement with our present calculations, but, as is seen for higher ionization stages, this method fails to account correctly for low-temperature DR. The results of Mewe et al (1980), on the other hand, were obtained using a parameterized empirical formula based upon the renormalized results of Jacobs et al (1977) and Ansari et al (1970) for 3p → 3d, 3p → 4s, and (2006); ( §) extrapolated along the isoelectronic sequence; ( ) dominant excitation threshold -see Table 2; (d) single configuration TDCHF results of Ghosh & Mukherjee (1997).…”

Section: Dr Resultsmentioning

confidence: 99%

“…Both MCBP results are somewhat Mazzotta et al (1998); (c) green solid curve, LS results of Jacobs & Davis (1983); red dashed curve, present MCBP results. On the right is Fe ix: black dots with error bars, TSR experiment by Schmidt et al (2008); (a) red solid curve, empirical results of Mewe et al (1980); (b) blue solid curve, compilation of Arnaud & Raymond (1992); (c) black solid curve, result of Jacobs et al (1977); (d) green solid curve, empirical data of Kato & Asano (1999); (e) black dash-dotted curve, empirical formula of Hahn (1991); (f) "4CF" and "5CF" MCBP results of Badnell (2006); red dashed curve, present "18CF" MCBP results; The present RR results are also shown as the long-dashed curve.…”

Section: Dr Resultsmentioning

confidence: 99%

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Dielectronic recombination of argon-like ions

Nikolić¹,

Gorczyca²,

Korista³

et al. 2010

A&A

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Context. 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.Aims. We provide results for the total and partial Maxwellian-averaged DR rate coefficients from the initial ground level of K iiZn xiii ions. It is expected that these new results will advance the accuracy of the ionization balance for Ar-like M-shell ions and pave the way towards a detailed modeling of astrophysically relevant X-ray absorption features. Methods. We utilize the AUTOSTRUCTURE computer code to obtain the accurate core-excitation thresholds in target ions and carry out multiconfiguration Breit-Pauli (MCBP) calculations of the DR cross section in the independent-processes, isolated-resonance, distorted-wave (IPIRDW) approximation. Results. Our results mediate the complete absence of direct DR calculations for certain Ar-like ions and question the reliability of the existing empirical rate formulas, often inferred from renormalized data within this isoelectronic sequence.

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Section: Dr Resultsmentioning

confidence: 99%

Section: Dr Resultsmentioning

confidence: 99%

Dielectronic recombination of argon-like ions

Nikolić¹,

Gorczyca²,

Korista³

et al. 2010

A&A

View full text Add to dashboard Cite

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“…The fitted parameters are listed in Table 1, which should enable fast evaluation of DR rate coefficients in plasma models. The existing DR rate coefficients of Na-like ions, widely used in coronal ionization balance calculations, are mostly based on the work of Jacobs et al (1977Jacobs et al ( , 1979 and modifications of Zhdanov (1982) and Dube & LaGatutta (1987) for the 2p ! 3l 0 nl 00 inner-shell excitation channels.…”

Section: Resultsmentioning

confidence: 99%

Dielectronic Recombination Rate Coefficients of Na‐like Ions from Mg ii to Zn xx Forming Mg‐like Systems

2004

ASTROPHYS J SUPPL S

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Dielectronic recombination (DR) rate coefficients for Na-like ions of elements with 12 Z 30 forming Mglike systems are calculated in the independent-process, isolated-resonance approximation. Both Á N ¼ 0 and ÁN > 0 core excitation DR channels are included, as well as the inner-shell excitation channels. Convenient analytic fits are given to the calculated rate coefficients, and comparison is made with the existing theoretical and experimental results.

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“…We checked that the calculated rates summed over n ≥ 2 and l, added to the rate of the 1s 2 (ground level) level, are similar to the total RR rates calculated by Arnaud & Rothenflug (1985), Pequignot et al (1991), Mazzotta et al (1998), Jacobs et al (1977) (for He-like Fe ion) and Nahar (1999) (for O vii). Since these authors used hydrogenic formulae, the RR rate coefficient depends on which screening value was used.…”

Section: Radiative Recombination (Rr) Coefficients Ratesmentioning

confidence: 96%

X-ray photoionized plasma diagnostics with helium-like ions. Application to warm absorber-emitter in active galactic nuclei

Porquet

Dubau

2000

Astron. Astrophys. Suppl. Ser.

314

435

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Abstract. We present He-like line ratios (resonance, intercombination and forbidden lines) for totally and partially photoionized media. For solar plasmas, these line ratios are already widely used for density and temperature diagnostics of coronal (collisional) plasmas. In the case of totally and partially photoionized plasmas, He-like line ratios allow for the determination of the ionization processes involved in the plasma (photoionization with or without an additional collisional ionization process), as well as the density and the electronic temperature.With the new generation of X-ray satellites, Chandra/AXAF, XMM and Astro-E, it will be feasible to obtain both high spectral resolution and high sensitivity observations. Thus in the coming years, the ratios of these three components will be measurable for a large number of non-solar objects.In particular, these ratios could be applied to the Warm Absorber-Emitter, commonly present in Active Galactic Nuclei (AGN). A better understanding of the Warm Absorber connection to other regions (Broad Line Region, Narrow Line Region) in AGN (Seyferts type-1 and type-2, low-and high-redshift quasars...) will be an important key to obtaining strong constraints on unified schemes.We have calculated He-like line ratios, for Z = 6, 7, 8, 10, 12 and 14, taking into account the upper level radiative cascades which we have computed for radiative and dielectronic recombinations and collisional excitation. The atomic data are tabulated over a wide range of temperatures in order to be used for interpreting a large variety of astrophysical plasmas.

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The influence of autoionization accompanied by excitation on dielectronic recombination and ionization equilibrium

Cited by 228 publications

References 0 publications

Dielectronic recombination of argon-like ions

Dielectronic recombination of argon-like ions

Dielectronic Recombination Rate Coefficients of Na‐like Ions from Mg ii to Zn xx Forming Mg‐like Systems

X-ray photoionized plasma diagnostics with helium-like ions. Application to warm absorber-emitter in active galactic nuclei

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