Electron ionization cross sections in the Born approximation

McGuire, E. J.

doi:10.1103/physreva.16.62

Cited by 125 publications

(88 citation statements)

References 41 publications

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“…1 configuration of iron are also depicted in Figure 2 Convergence of the various cross sections at elevated electron impact energies is observed for our DM cross section and the cross sections obtained by Deutsch et al [62], McGuire [63] and Shah et al [59] above 500 eV. The cross section reported by Tsipinyuk et al [44] approaches the experimental cross section of Freund et al [60] above 100 eV.…”

Section: Eics Of Fesupporting

confidence: 68%

“…Contributions from all lower lying orbitals were found to be negligible for the cross section. Data from earlier theoretical studies yield higher [26] and McGuire et al [63], respectively. The BEB-AE cross section (thick red line in Fig.…”

Section: Eics Of Fementioning

confidence: 89%

“…Thick orange line: theoretical cross section obtained by Goswami et al [26]. Thick violet line: theoretical cross section obtained by McGuire [63]. Open black squares: Experimental cross section from Freund et al [60].…”

Section: Eics Of Fementioning

confidence: 99%

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Electron impact ionisation cross sections of iron hydrogen clusters

et al. 2016

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Abstract.We computed electron impact ionisation cross sections (EICSs) of iron hydrogen clusters, FeHn with n = 1, 2, . . . , 10, from the ionisation threshold to 10 keV using the Deutsch-Märk (DM) and the binary-encounter-Bethe (BEB) formalisms. at 51 eV for the DM method. Cross sections calculated via the BEB method are substantially higher than the ones obtained via the DM method, up to a factor of about two for FeH and FeH2. The formation of Fe-H bonds depopulates the iron 4s orbital, causing significantly lower cross sections for the small iron hydrides compared to atomic iron. Both the DM and BEB cross sections can be fitted perfectly against a simple expression used in modelling and simulation codes in the framework of nuclear fusion research. The energetics of the iron hydrogen clusters change substantially when exact exchange is present in the density functional, while the cluster geometries do not depend on this choice.

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Section: Eics Of Fesupporting

confidence: 68%

Section: Eics Of Fementioning

confidence: 89%

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Electron impact ionisation cross sections of iron hydrogen clusters

et al. 2016

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“…For Ca i we selected three data sets (McGuire 1977(McGuire , 1997Roy & Kai 1983) of theoretical calculations. The first two sets of McGuire are in reasonably good agreement, although they are ∼30% higher than Roy's.…”

Section: Di: 3d and 4s Cross-sectionsmentioning

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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“…Calculations using the CBO approximation, were carried out by Golden and Sampson (1977), Golden et al (1978), Golden and Sampson (1980) and Moores et al (1980). Born approximation cross sections were computed for ions of Al and Na (McGuire, 1977(McGuire, , 1982. The importance of excitation-autoionization and direct ionization of Na-like ions was pointed out by Sampson (1982).…”

Section: Introductionmentioning

confidence: 99%

Atomic data for x-ray astrophysics

2007

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We review the available atomic data used for interpreting and modeling X-ray observations. The applications for these data can be divided into several levels of detail, ranging from compilations which can be used with direct inspection of raw data, such as line finding lists, to synthetic spectra which attempt to fit to an entire observed dataset simultaneously. This review covers cosmic sources driven by both electron ionization and photoionization and touches briefly on planetary surfaces and atmospheres. We review all of this, the applications to X-ray astronomy, the available data, recommendations for astronomical users, and attempt to point out the applications where the shortcomings are greatest.

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Electron ionization cross sections in the Born approximation

Cited by 125 publications

References 41 publications

Electron impact ionisation cross sections of iron hydrogen clusters

Electron impact ionisation cross sections of iron hydrogen clusters

X-ray emission from thin plasmas

Atomic data for x-ray astrophysics

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