Resonances in Electron-Impact Single, Double, and Triple Ionization of Heavy Metal ions

Müller, A.; Tinschert, K.; Hofmann, G.; Salzborn, E.; Dunn, G. H.

doi:10.1103/physrevlett.61.70

Cited by 95 publications

(49 citation statements)

References 12 publications

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“…These are due to the REDA and READI processes which result in single ionization (LaGattuta & Hahn 1981;Henry & Msezane 1982;Müller et al 1988aMüller et al , 1988b.…”

Section: Results For Single Ionizationmentioning

confidence: 99%

“…As discussed above, double ionization can also occur through single ionization of an inner shell electron with subsequent autoionization. Other indirect processes such as EA and resonant processes analogous to those expected for single ionization may also occur in the double ionization cross section (Müller et al 1988b). …”

Section: Introductionmentioning

confidence: 99%

“…In that same energy range resonant processes such as resonant excitation double autoionization (REDA) and resonant excitation auto-doubleionization (READI) are predicted in the cross section. These occur through dielectronic capture when an ion forms an excited state that subsequently decays by ejecting two electrons (LaGattuta & Hahn 1981;Henry & Msezane 1982;Müller et al 1988aMüller et al , 1988bMüller 2008). In the REDA process, the electrons are released sequentially, whereas in READI the two electrons are ejected simultaneously.…”

Section: Introductionmentioning

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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“…These are due to the REDA and READI processes which result in single ionization (LaGattuta & Hahn 1981;Henry & Msezane 1982;Müller et al 1988aMüller et al , 1988b.…”

Section: Results For Single Ionizationmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

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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“…In a recent series of publications [4][5][6][7] we have demonstrated the capability of our experimental arrangement to detect fine details in electron impact ionization cross sections of ions. We identified REDA resonances first in heavy metal ions [4] and then also in lighter ions [5] and observed several new resonant and non-resonant ionization channels.…”

Section: Resonant-excitation-double-autoionizationmentioning

confidence: 96%

Doubly autoionizing capture resonances ine + Mg+ collisions

Müller¹,

Hofmann

Tinschert

et al. 1990

Z Phys D - Atoms, Molecules and Clusters

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Fine details in the cross section for electron impact ionization of Mg + ions (configuration l s22s z 2p 6 3s) have been measured with an energy resolution of 0.3 eV. Structure on top of a smooth direct-ionization "background" reflects the presence of indirect ionization mechanisms. Such contributions in a Na-like ion involve non-resonant excitation of a 2p electron to singly autoionizing intermediate states subsequently decaying into the channel of net single ionization of the parent ion. We observe even stronger indirect contributions from resonant excitation of a 2p electron with simultaneous dielectronic capture of the projectile electron into doubly autoionizing states which decay by successive emission of two electrons.

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“…Although other processes such as EMA, have been identified in some measurements (Müller et al 1988), incorporating these effects into our representations of the cross sections would be cumbersome as there is insufficient data upon which to base an interpolation. Fortunately, the resulting cross section errors are usually of little impact.…”

Section: Electron-impact Multiple-ionization Cross Sectionsmentioning

confidence: 99%

Electron-impact Multiple-ionization Cross Sections for Atoms and Ions of Helium through Zinc

Hahn

Müller

Savin

2017

ApJ

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We have compiled a set of electron-impact multiple ionization (EIMI) cross sections for astrophysically relevant ions. EIMI can have a significant effect on the ionization balance of non-equilibrium plasmas. For example, it can be important if there is a rapid change in the electron temperature or if there is a non-thermal electron energy distribution, such as a kappa distribution. Cross sections for EIMI are needed in order to account for these processes in plasma modeling and for spectroscopic interpretation.Here, we describe our comparison of proposed semiempirical formulae to the available experimental EIMI cross section data. Based on this comparison, we have interpolated and extrapolated fitting parameters to systems that have not yet been measured. A tabulation of the fit parameters is provided for 3466 EIMI cross sections. We also highlight some outstanding issues that remain to be resolved.

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Resonances in Electron-Impact Single, Double, and Triple Ionization of Heavy Metal ions

Cited by 95 publications

References 12 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⁺

Doubly autoionizing capture resonances ine + Mg+ collisions

Electron-impact Multiple-ionization Cross Sections for Atoms and Ions of Helium through Zinc

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Resonances in Electron-Impact Single, Double, and Triple Ionization of Heavy Metal ions

Cited by 95 publications

References 12 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+

Doubly autoionizing capture resonances ine + Mg+ collisions

Electron-impact Multiple-ionization Cross Sections for Atoms and Ions of Helium through Zinc

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Product

Resources

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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⁺