Dielectronic recombination rates, ionization equilibrium, and radiative energy-loss rates for neon, magnesium, and sulfur ions in low-density plasmas

Jacobs, V. L.; Davis, J.; Rogerson, J. E.; Bláha, M.

doi:10.1086/157121

Cited by 76 publications

(76 citation statements)

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“…S vi plasma rate coefficents by Badnell (1991) and Altun et al (2006) have similar values and are ∼40% lower than our data, while above 6 × 10 4 K, the rate coefficients by Jacobs et al (1979) are ∼60% lower than our data. Below 1.3 × 10 4 K and 2 × 10 4 K the S vi and Ar viii plasma DR rate coefficients respectively contain mostly DR channels located below the field-ionization limits and are not affected by the procedure used to account for the field-ionization in the measurement.…”

Section: Plasma Dr Rate Coefficientssupporting

confidence: 54%

“…At low temperatures, below 2 × 10 4 K, large spreads can be observed between the data available in the literature for both ions. The S vi plasma rate coefficients by Aldrovandi & Pequignot (1973) and Jacobs et al (1979) neglect DR into the lowest available n states and have negligible values at these temperatures.…”

Section: Plasma Dr Rate Coefficientsmentioning

confidence: 98%

“…3. The exclusion of the range up to 10 −3 meV (the typical energy range of enhancements in recombination (2004), and stars - Jacobs et al (1979). Horizontal arrows show temperature ranges in photoionized (A) and collisionally ionized (B) plasmas, where the abundance of the respective ions is higher than 10% of the maximum occurrence (Kallman & Bautista 2001).…”

Section: Plasma Dr Rate Coefficientsmentioning

confidence: 99%

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Experimental dielectronic recombination rate coefficients for Na-like S VI and Na-like Ar VIII

Orbán¹,

Altun

Källberg

et al. 2009

A&A

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Aims. Absolute recombination rate coefficients for two astrophysically relevant Na-like ions are presented.Methods. Recombination rate coefficients of S vi and Ar viii are determined from merged-beam type experiments at the CRYRING electron cooler. Calculated rate coefficients are used to account for recombination into states that are field-ionized and therefore not detected in the experiment. Results. Dielectronic recombination rate coefficients were obtained over an energy range covering Δ n = 0 core excitations. For Na-like Ar a measurement was also performed over the Δ n = 1 type of resonances. In the low-energy part of the Ar viii spectrum, enhancements of more than one order of magnitude are observed as compared to the calculated radiative recombination. The plasma recombination rate coefficients of the two Na-like ions are compared with calculated results from the literature. In the 10 3 −10 4 K range, large discrepancies are observed between calculated plasma rate coefficients and our data. At higher temperatures, above 10 5 K, in the case of both ions our data is 30% higher than two calculated plasma rate coefficients, other data from the literature having even lower values. Conclusions. Discrepancies below 10 4 K show that at such temperatures even state-of-the-art calculations yield plasma rate coefficients that have large uncertainties. The main reason for these uncertainties are the contributions from low-energy resonances, which are difficult to calculate accurately.

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Section: Plasma Dr Rate Coefficientssupporting

confidence: 54%

Section: Plasma Dr Rate Coefficientsmentioning

confidence: 98%

Section: Plasma Dr Rate Coefficientsmentioning

confidence: 99%

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Experimental dielectronic recombination rate coefficients for Na-like S VI and Na-like Ar VIII

Orbán¹,

Altun

Källberg

et al. 2009

A&A

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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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“…The orange dotted line shows the results from our field-ionization free AUTOSTRUCTURE calculation. The calculated plasma rate coefficients from the literature are denoted as follows: stars, Altun et al (2004); circles, Nahar (1995); squares, Shull & Steenberg (1982); triangles, Mazzotta et al (1998); and diamond, Jacobs et al (1979). The results from Nahar include contribution from both RR and DR.…”

Section: Plasma Recombination Rate Coefficientsmentioning

confidence: 99%

RECOMBINATION RATE COEFFICIENTS OF BORON-LIKE Ne

Mahmood

Orbán

Ali

et al. 2013

ApJ

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Recombination of Ne 5+ was measured in a merged-beam type experiment at the heavy-ion storage ring CRYRING. In the collision energy range 0-110 eV resonances due to 2s 2 2p → 2s2p 2 (Δn = 0) and 2s 2 2p → 2s 2 3l (Δn = 1), core excitations were observed. The experimentally derived rate coefficients agree well with the calculations obtained using AUTOSTRUCTURE. At low energies, recombination is dominated by resonances belonging to the spinforbidden 2s2p 2 ( 4 P J )nl series. The energy-dependent rate coefficients were convoluted with a Maxwell-Boltzmann electron energy distribution to obtain plasma recombination rate coefficients. The data from the literature deviate from the measured results at low temperature.

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Dielectronic recombination rates, ionization equilibrium, and radiative energy-loss rates for neon, magnesium, and sulfur ions in low-density plasmas

Cited by 76 publications

References 0 publications

Experimental dielectronic recombination rate coefficients for Na-like S VI and Na-like Ar VIII

Experimental dielectronic recombination rate coefficients for Na-like S VI and Na-like Ar VIII

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

RECOMBINATION RATE COEFFICIENTS OF BORON-LIKE Ne

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