Electron impact single and double ionization of magnesium

Jha, L. K.; Roy, B N

doi:10.1140/epjd/e2002-00114-3

Cited by 24 publications

(17 citation statements)

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“…Electron-impact double ionization of Mg near threshold. Solid squares: non-perturbative TDCC calculations for direct double ionization, solid line: perturbative DW calculations for indirect 2s and 2p ionization-autoionization, solid triangles connected by dashed line: binary encounter calculations for direct double ionization [22], solid circles: experiment [16], solid diamonds: experiment [17] (1.0 Mb = 1.0 × 10 −18 cm 2 ). reasonable agreement, while the TDCC and DW cross sections begin to achieve agreement for the higher partial waves.…”

Section: Tdcc-tdcc-l 3dmentioning

confidence: 99%

Electron-impact double ionization of magnesium

Pindzola

Ludlow

Robicheaux

et al. 2009

J. Phys. B: At. Mol. Opt. Phys.

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Theory and experiment are compared for the electron-impact double ionization of Mg. Direct ionization cross sections, involving the simultaneous ionization of both 3s electrons, are calculated using a non-perturbative time-dependent close-coupling method. Indirect ionization cross sections, involving the ionization of either a 2p or 2s electron followed by autoionization, are calculated using a perturbative time-independent distorted-wave method. At low energies the direct ionization cross sections are found to be in good agreement with experiments, while at the higher energies the indirect ionization cross sections are also found to be in good agreement with experiments.

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Section: Tdcc-tdcc-l 3dmentioning

confidence: 99%

Electron-impact double ionization of magnesium

Pindzola

Ludlow

Robicheaux

et al. 2009

J. Phys. B: At. Mol. Opt. Phys.

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“…A comparison be-tween theory and experiment further supports the idea that correlations among more than three electrons are required to explain the probability of double ionization of a target by electron impact [26]. Therefore, the present quantum mechanical approaches are limited in that they approximate electron-electron correlations in their model of double ionization of a target by electron impact [23][24][25]27].…”

Section: Introductionmentioning

confidence: 56%

“…Similarly, Ref. [24] and Ref. [25] perform two separate TDCC calculations on two distinct sets of electrons and add the probability contributions from the two calculations to recover the knee structure in the probability of double ionization.…”

Section: Introductionmentioning

confidence: 99%

“…The piece-wise treatments in Ref. [23][24][25] serve as evidence that the double ionization of a target by electron impact is indeed not a Coulomb 3-body problem, but a more complicated, fully coupled, Coulomb n-body problem for n 4. A comparison be-tween theory and experiment further supports the idea that correlations among more than three electrons are required to explain the probability of double ionization of a target by electron impact [26].…”

Section: Introductionmentioning

confidence: 99%

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Double-ionization mechanisms of magnesium driven by electron impact

Mittal,

Dubois,

Chandre

et al. 2019

Preprint

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We study double ionization of Mg by electron impact through the vantage point of classical mechanics. We consider all electron-electron correlations in a Coulomb 4-body problem, where three electrons belong to the atom and the fourth electron causes the impact ionization. From our model we compute the double ionization probability of Mg for impact energies in [15, 125] eV. Double ionization occurs through eight double ionization mechanisms, which we classify into four categories: Inner Shell Capture, Direct, Delay and Ionized Inner Shell mechanisms. We show that Delay and Ionized Inner Shell mechanisms require electron-electron correlations among the four electrons, and are responsible for the second increase in the double ionization probability. Furthermore, we show that our theoretical prediction about the relative prominence of certain double ionization mechanisms is in agreement with experimental results on the relative prominence of non-first over first order mechanisms.

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“…In these calculations Hatree-Fock (HF) and hydrogenic velocity distributions were used while considering ejection of the first and the second target electron respectively. Later on, Jha and Roy [20,21] used HF velocity distribution while considering the ejection of both electrons of the target in calculations of direct double ionization cross sections. In case of heavy charged particle the binary encounter calculations of double ionization cross sections of atoms are scarce in literature.…”

Section: Introductionmentioning

confidence: 99%

Study of Alpha Particle Impact Double Ionization Cross Sections of Cu Atom

et al. 2021

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Semi-classical binary encounter approximation has been used for the study of ionization cross sections of Cu atom at ground state. Projectile, alpha particle, with energy varying from threshold to 360 keV/amu are considered for direct double ionizations cross section. Out of the two path ways of ionization we have ruled out the indirect process (like excitation-auto ionization, Auger effect) of double ionization. We considered direct - ionization of outer shells of Cu atom. Vriens accurate expression of cross section for energy transfer ΔE(σΔE ) and Hertree-Fock velosity distribution function for the target electrons are used. The theoretical value of double ionization cross sections at impact energy 300 keV/amu is 0.98 x 10-16 cm2 which is same as experimental values at that impact energy. Above energy of 300 keV/amu, the calculated results underestimates the experimental data and at 360 keV/amu their magnitude are 0.77 x 10-16 and 1.0 x 10-16 respectively. Above impact energy of 75keV/amu, all the theoretical results have ratio factor within 2. Out of the total number of theoretical data 75% are under valid range of ratio factor 2 and among the valid range 41% have ratio factor below 1.325 and hence calculated results of double ionization cross section lie in the acceptable range. The linear correlation coefficient (R square) and standard deviation (SD) of linear fit are 0.6984 and 0.7883 respectively. In low energy range the theoretical results are more apart from corresponding experimental values and possess relatively more error compared to intermediate and higher energy region. Calculated results are in satisfactory agreement with experiment in intermediate and high energy range.

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Electron impact single and double ionization of magnesium

Cited by 24 publications

References 0 publications

Electron-impact double ionization of magnesium

Electron-impact double ionization of magnesium

Double-ionization mechanisms of magnesium driven by electron impact

Study of Alpha Particle Impact Double Ionization Cross Sections of Cu Atom

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