High-resolution measurement of dielectronic recombination of lithiumlike<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msup><mml:mrow><mml:mi mathvariant="normal">Cu</mml:mi></mml:mrow><mml:mrow><mml:mn>2</mml:mn><mml:mn>6</mml:mn><mml:mo>+</mml:mo></mml:mrow></mml:msup></mml:mrow></mml:math>

Kilgus, G.; Habs, D.; Schwalm, D.; Wolf, A.; Badnell, N. R.; Müller, Alfred

doi:10.1103/physreva.46.5730

Cited by 152 publications

(151 citation statements)

References 26 publications

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“…The electron density n e is of the order of 10 7 cm −3 and is calculated from the measured electron current and the geometry of the probe beam (Kilgus et al 1992). The total number of stored ions per unit length N i is calculated from the measured ion current.…”

Section: Discussionmentioning

confidence: 99%

“…Initially, both the Cooler and Target electron beams were set to the spacecharge-corrected cooling energy of 1460 eV. The center-of-mass energy spread is limited by the Cooler electron temperature, which can be described by a flattened Maxwellian distribution with temperatures in the perpendicular and parallel directions of typically k B T ⊥ = 13.5 meV and k B T = 180 μeV (Kilgus et al 1992;Schippers et al 2001). During measurement, the average ion current was 1-2 μA.…”

Section: Methodsmentioning

confidence: 99%

“…The experiments basically followed the procedure of previous experiments (Kilgus et al 1992;Linkemann et al 1995a;Kenntner et al 1995;Schippers et al 2001;Lestinsky et al 2009). Details related specifically to ionization are described in Hahn et al (2010).…”

Section: Methodsmentioning

confidence: 99%

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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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Section: Discussionmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

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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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“…The data were finally corrected for the space grid with 70 tm holes was inserted in front of the detector. charge of the electron beam 26 and the effect of the toroidal The transmission of the grid is P = 0.297_ 0.015. Since some magnetic field in the curved edges of the electron cooler.…”

mentioning

confidence: 99%

Dissociative recombination study of Na+(D2O) in a storage ring

Zhaunerchyk¹,

Ehlerding²,

Geppert³

et al. 2004

The Journal of Chemical Physics

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The public reporting burden for this collection of information is estimated to average 1 hour per response, including the time for reviewing instructions, searching existing data sources, gathering and maintaining the data needed, and completing and reviewing the collection of information. Send comments regarding this burden estimate or any other aspect of this collection of information, including suggestions for reducing the burden SPONSORINGIMONITORING AGENCY NAME(S) AND ADDRESS(ES) 10. SPONSORIMONITOR'S ACRONYM(S) AFRL/VSBXT SPONSOR/MONITOR'S REPORT NUMBER(S)12. DISTRIBUTIONIAVAILABILITY STATEMENT Approved for public release; distribution unlimited. SUPPLEMENTARY NOTES ABSTRACTThe dissociative recombination of NA+(D 2 0) ion has been studied at the heavy-ion storage ring CRYRING (Manne Siegbahn Laboratory, Stockholm University). The cross section has been measured as a function of center-of-mass energy ranging from 1 meV to 0.1 eV and found to have an E-1. 37 dependence. The rate coefficient has been deduced to be (2.3 ± 0.32) x 10-7 (Tý1300)-°.95-a.° cm 3 ms-for Te= 50-1000 K. The branching ratios have been mesured at 0 eV. Of the four energetically accessivble dissociation channels, three channels are found to occur although the channel that breaks the weak Nat--D 2 O bond is by far dominant. The dissociative recombination of Na+(D 2 0) ion has been studied at the heavy-ion storage ring CRYRING (Manne Siegbahn Laboratory, Stockholm University). The cross section has been measured as a function of center-of-mass energy ranging from 1 meV to 0.1 eV and found to have an E-1. SUBJECT 7dependence. The rate coefficient has been deduced to be (2.3±_0.32)X 10-7 (Te/300)-0°95 +-0 0 ' cm 3 s-1 for Te,= 50-1000K. The branching ratios have been measured at 0 eV. Of the four energetically accessible dissociation channels, three channels are found to occur although the channel that breaks the weak Na+-D 2 0 bond is by far dominant.

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“…We have also carried out ∆N = 1 measurements for Na-like Fe 15+ [20,21], O-like Fe 18+ [16,23], and Be-like Fe 22+ (in preparation). Additionally, we note that there have been ∆N = 0 and ∆N = 1 DR measurements for Li-like Si 11+ [26] and Cu 26+ [27], and also for F-like Se 35+ [28]. To summarize, storage ring ∆N = 0 DR measurements exist for all L-shell ions and a few of the M-shell ions.…”

Section: Research Programmentioning

confidence: 99%

Ionization and Recombination with Electrons: Laboratory Measurements and Observational Consequences

Savin

2005

AIP Conference Proceedings

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Abstract.Reliably interpreting spectra from both photoionized and electron-ionized cosmic plasmas requires an accurate understanding of the ionization balance of the source and the underlying atomic physics which produces the ionization structure. Uncertainties in ionization balance calculations hamper our ability to model cosmic sources and to infer reliably their properties. Of particular importance are accurate rate coefficients for electron impact ionization (EII) and dielectronic recombination (DR). Here I briefly review the astrophysical implications due to current uncertainties in EII and DR and discuss our ongoing laboratory work aimed to remove these uncertainties.

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High-resolution measurement of dielectronic recombination of lithiumlikeCu26+

Cited by 152 publications

References 26 publications

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

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

Dissociative recombination study of Na+(D2O) in a storage ring

Ionization and Recombination with Electrons: Laboratory Measurements and Observational Consequences

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High-resolution measurement of dielectronic recombination of lithiumlikeCu26+

Cited by 152 publications

References 26 publications

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

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

Dissociative recombination study of Na+(D2O) in a storage ring

Ionization and Recombination with Electrons: Laboratory Measurements and Observational Consequences

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

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