Electron-impact ionization of<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msup><mml:mrow><mml:mi mathvariant="normal">Si</mml:mi></mml:mrow><mml:mrow><mml:mn>6</mml:mn><mml:mo>+</mml:mo></mml:mrow></mml:msup></mml:mrow></mml:math>and<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msup><mml:mrow><mml:mi mathvariant="normal">Si</mml:mi></mml:mrow><mml:mrow><mml:mn>7</mml:mn><mml:mo>+</mml:mo></mml:mrow></mml:msup></mml:mrow>

Emmichoven, P.A. Zeijlmans van; Bannister, M. E.; Gregory, D. C.; Havener, C. C.; Phaneuf, R.A.; Bell, E W.; Guo, X. Q.; Thompson, J. S.; Sataka, M.

doi:10.1103/physreva.47.2888

Cited by 19 publications

(12 citation statements)

References 17 publications

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“…1.For Si 7+ , the present FAC calculation is lower than Chianti v7 compilation by 10%-15%. Yet it shows a better agreement with experimental data within 10%(Zeijlmans et al 1993). For Si 8+,9+ ions, the present FAC calculations show a good agreement with Chianti v7 compilation within 10%.…”

supporting

confidence: 73%

“…For Si 6+ , the present FAC calculations are lower than experimental values by 20% (Zeijlmans et al 1993), however the Lotz formula's result and Chianti v7 compilation show better consistencies with the measurement within 10%. Zeijlmans et al (1993) suggested that metastables of 2s2p 5 configuration may be responsible for the measured cross section being 20% larger than their configuration averaged distorted-wave calculation. But the present level-resolved FAC calculations demonstrate that Table 1 Configurations included in calculations for level-resolved collisional ionization of Si 4+ -Si 11+ .…”

Section: Collisional Ionizationcontrasting

confidence: 49%

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X-Ray and Euv Spectroscopy of Various Astrophysical and Laboratory Plasmas: Collisional, Photoionization and Charge-Exchange Plasmas

Liang

Wang

et al. 2014

ApJ

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Several laboratory facilities were used to benchmark theoretical spectral models those extensively used by astronomical communities. However there are still many differences between astrophysical environments and laboratory miniatures that can be archived. Here we setup a spectral analysis system for astrophysical and laboratory (sasal) plasmas to make a bridge between them, and investigate the effects from non-thermal electrons, contribution from metastable level-population on level populations and charge stage distribution for coronal-like, photoionized, and geocoronal plasmas. Test applications to laboratory measurement (i.e. EBIT plasma) and astrophysical observation (i.e. Comet, Cygnus X-3) are presented. Time evolution of charge stage and level population are also explored for collisional and photoionized plasmas.

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supporting

confidence: 73%

Section: Collisional Ionizationcontrasting

confidence: 49%

X-Ray and Euv Spectroscopy of Various Astrophysical and Laboratory Plasmas: Collisional, Photoionization and Charge-Exchange Plasmas

Liang

Wang

et al. 2014

ApJ

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“…We note that the measurements for Si vii (Zeijlmans van Emmichoven et al 1993) could be affected by metastable ions that show an increase between 10-20% of the cross-section at the peak compared with the distorted-wave calculations. This is the reason we neglect this data set.…”

Section: Di: 2p Cross Sectionmentioning

confidence: 81%

“…The measurements for Si viii (Zeijlmans van Emmichoven et al 1993) were correctly fitted using Eq. 2, obtaining a maximum uncertainty of ∼6%.…”

Section: Di: 2p Cross-sectionmentioning

confidence: 99%

X-ray emission from thin plasmas

Urdampilleta

Kaastra

Mehdipour

2017

A&A

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Every observation of astrophysical objects involving a spectrum requires atomic data for the interpretation of line fluxes, line ratios, and ionization state of the emitting plasma. One of the processes that determines it is collisional ionization. In this study, an update of the direct ionization (DI) and excitation-autoionization (EA) processes is discussed for the H to Zn-like isoelectronic sequences. In recent years, new laboratory measurements and theoretical calculations of ionization cross-sections have become available. We provide an extension and update of previous published reviews in the literature. We include the most recent experimental measurements and fit the cross-sections of all individual shells of all ions from H to Zn. These data are described using an extension of Younger's and Mewe's formula, suitable for integration over a Maxwellian velocity distribution to derive the subshell ionization rate coefficients. These ionization rate coefficients are incorporated in the high-resolution plasma code and spectral fitting tool SPEX V3.0.

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“…Until recently, the only available experimental data for the Si isonuclear sequence were for Si + [4]. Measurements of absolute cross sections for other charge states of Si have recently been made [5], and this paper is one in a series dealing with Si ions. MAGNET The experiment was performed using crossed beams of ions and electrons.…”

Section: Introductionmentioning

confidence: 99%

Absolute cross sections for electron-impact single ionization ofSi+andSi2+
Djurić
¹
,
Bell
²
,
Guo
³

et al. 1993
Phys. Rev. A
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24
4
31
0
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Absolute cross sections for electron-impact single ionization of Si+ and Si + have been measured using crossed beams of ions and electrons and calculated using a configuration-average distorted-wave method. Corrections have been made for metastable components and small fractions of nitrogen impurities in the incident ion beams. Excitation-autoionization measurably enhances the cross sections of both Si+ and Si +. Ionization rate coef5cients and fitting parameters are presented for the experimental data.PACS number(s): 34.80.Kw

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Electron-impact ionization ofSi6+andSi7+

Cited by 19 publications

References 17 publications

X-Ray and Euv Spectroscopy of Various Astrophysical and Laboratory Plasmas: Collisional, Photoionization and Charge-Exchange Plasmas

X-Ray and Euv Spectroscopy of Various Astrophysical and Laboratory Plasmas: Collisional, Photoionization and Charge-Exchange Plasmas

X-ray emission from thin plasmas

Absolute cross sections for electron-impact single ionization ofSi+andSi2+
Djurić
¹
,
Bell
²
,
Guo
³

et al. 1993
Phys. Rev. A
Self Cite
24
4
31
0
View full text Add to dashboard Cite

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Electron-impact ionization ofSi6+andSi7+

Cited by 19 publications

References 17 publications

X-Ray and Euv Spectroscopy of Various Astrophysical and Laboratory Plasmas: Collisional, Photoionization and Charge-Exchange Plasmas

X-Ray and Euv Spectroscopy of Various Astrophysical and Laboratory Plasmas: Collisional, Photoionization and Charge-Exchange Plasmas

X-ray emission from thin plasmas

Absolute cross sections for electron-impact single ionization ofSi+andSi2+Djurić1, Bell2, Guo3 et al. 1993Phys. Rev. ASelf Cite244310View full textAdd to dashboardCite

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Absolute cross sections for electron-impact single ionization ofSi+andSi2+
Djurić
¹
,
Bell
²
,
Guo
³

et al. 1993
Phys. Rev. A
Self Cite
24
4
31
0
View full text Add to dashboard Cite