Electron impact ionization and dielectronic recombination of sodium-like iron ions

Linkemann, J.; Kenntner, J.; Müller, A.; Wolf, A.; Habs, D.; Schwalm, D.; Spies, W.; Uwira, O.; Frank, A.; Liedtke, A.; Hofmann, G.; Salzborn, E.; Badnell, N. R.; Pindzola, M. S.

doi:10.1016/0168-583x(95)00095-x

Cited by 56 publications

(59 citation statements)

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“…For ÁN ¼ 1 channels, the discrepancy between the theory and the experiment is larger. However, compared with the original calculation of Linkemann et al (1995), the present results agree with the measurements much better, especially for resonances below 650 eV. Müeller (1999) derived experimental total DR rate coefficients of Fe xvi based on these measurements.…”

Section: Resultssupporting

confidence: 72%

“…Both ÁN ¼ 0 and ÁN ¼ 1 DR resonances of Fe xvi were measured in storage-ring experiments by Linkemann et al (1995). In Figures 3 and 4, we show our calculated resonance strengths after convolving with the experimental energy resolution and including the extrapolated rate coefficients up to n ¼ 86 for the captured electron, which is the estimated experimental cutoff due to field ionization.…”

Section: Resultsmentioning

confidence: 99%

“…In Figures 3 and 4, we show our calculated resonance strengths after convolving with the experimental energy resolution and including the extrapolated rate coefficients up to n ¼ 86 for the captured electron, which is the estimated experimental cutoff due to field ionization. The experimental results of Linkemann et al (1995) are also plotted for comparison. For ÁN ¼ 0 channels, the calculated and measured resonance strengths agree with each other very well, except for minor differences at the series limits.…”

Section: Resultsmentioning

confidence: 99%

“…The solid line includes the extrapolated rate coefficients up to n ¼ 86, which is the estimated experimental cutoff due to field ionization. The measured rate coefficients of Linkemann et al (1995) are shown as a dot-dashed line. Notes.-The second column shows the present calculation.…”

Section: Resultsmentioning

confidence: 99%

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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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Section: Resultssupporting

confidence: 72%

Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

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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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“…This arrangement allows the ions to be stored long enough for typically all the metastable levels to radiatively relax before data acquisition begins. This fact has been exploited previously by Linkemann et al (1995aLinkemann et al ( , 1995b.…”

Section: Introductionmentioning

confidence: 84%

STORAGE RING CROSS SECTION MEASUREMENTS FOR ELECTRON IMPACT IONIZATION OF Fe¹¹⁺FORMING Fe¹²⁺AND Fe¹³⁺

Hahn¹,

Bernhardt²,

Grieser³

et al. 2011

ApJ

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We report ionization cross section measurements for electron impact single ionization (EISI) of Fe 11+ forming Fe 12+ and electron impact double ionization (EIDI) of Fe 11+ forming Fe 13+ . The measurements cover the center-of-mass energy range from approximately 230 eV to 2300 eV. The experiment was performed using the heavy-ion storage ring TSR located at the Max-Planck-Institut für Kernphysik in Heidelberg, Germany. The storage ring approach allows nearly all metastable levels to relax to the ground state before data collection begins. We find that the cross section for single ionization is 30% smaller than was previously measured in a single-pass experiment using an ion beam with an unknown metastable fraction. We also find some significant differences between our experimental cross section for single ionization and recent distorted wave (DW) calculations. The DW Maxwellian EISI rate coefficient for Fe 11+ forming Fe 12+ may be underestimated by as much as 25% at temperatures for which Fe 11+ is abundant in collisional ionization equilibrium. This is likely due to the absence of 3s excitation-autoionization (EA) in the calculations. However, a precise measurement of the cross section due to this EA channel was not possible because this process is not distinguishable experimentally from electron impact excitation of an n = 3 electron to levels of n 44 followed by field ionization in the charge state analyzer after the interaction region. Our experimental results also indicate that the EIDI cross section is dominated by the indirect process in which direct single ionization of an inner shell 2l electron is followed by autoionization, resulting in a net double ionization.

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Appendix: Data sources for the experimental ionization cross sections of atomic ions

Tawara¹

Collisions of Electrons With Atomic Ions

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Electron impact ionization and dielectronic recombination of sodium-like iron ions

Cited by 56 publications

References 10 publications

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

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

STORAGE RING CROSS SECTION MEASUREMENTS FOR ELECTRON IMPACT IONIZATION OF Fe¹¹⁺FORMING Fe¹²⁺AND Fe¹³⁺

Appendix: Data sources for the experimental ionization cross sections of atomic ions

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Electron impact ionization and dielectronic recombination of sodium-like iron ions

Cited by 56 publications

References 10 publications

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

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

STORAGE RING CROSS SECTION MEASUREMENTS FOR ELECTRON IMPACT IONIZATION OF Fe11+FORMING Fe12+AND Fe13+

Appendix: Data sources for the experimental ionization cross sections of atomic ions

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STORAGE RING CROSS SECTION MEASUREMENTS FOR ELECTRON IMPACT IONIZATION OF Fe¹¹⁺FORMING Fe¹²⁺AND Fe¹³⁺