Many-electron model for multiple ionization in atomic collisions

Archubi, Claudio Darío; Montanari, C. C.; Miraglia, J. E.

doi:10.1088/0953-4075/40/5/010

Cited by 35 publications

(25 citation statements)

References 56 publications

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“…The continuum distorted wave-eikonal initial state (CDW-EIS) approximation has been used by Galassi et al [9] and Montanari et al [10] to obtain multiple ionization cross sections by single-charged H + and He + ions in noble gases, in the intermediate-to high-velocity regime, yielding good agreement with the experiment. A different model based on the transport equation was used by Archubi et al [12] to calculate multiple ionization of noble gases by swift H + . This model differs from the independent-particle approximation in that it leads to a Poisson distribution for multiple ionization and gives results that are similar to the CDW-EIS model.…”

Section: Introductionmentioning

confidence: 99%

“…Only recently, after the exclusive measurement of multiple ionization of Ne by fast protons [13], the dynamic signatures of these time-delayed mechanisms were clearly identified and a good description of multiple ionization was obtained by combining the independent electron approximation with branching ratios for multiple ionization obtained from photoionization measurements [14][15][16][17][18][19]. This approach has been successfully used in the last years to describe multiple ionization in the intermediate-to high-velocity regime for several multielectron atoms [9,10,12,13,20,21,29,30].…”

Section: Introductionmentioning

confidence: 99%

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Effectiveness of projectile screening in single and multiple ionization of Ne by B2+

et al. 2011

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Pure multiple ionization cross sections of Ne by B 2+ projectiles have been measured in the energy range of 0.75 to 4.0 MeV and calculated using the continuum distorted wave-eikonal initial state approximation. The experiment and calculations show that the ionization cross sections by B 2+ , principally for the production of highly charged recoils, is strongly enhanced when compared to the bare projectile with the same charge state, He 2+ , at the same velocities.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Effectiveness of projectile screening in single and multiple ionization of Ne by B2+

et al. 2011

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“…Another approach which has been used to deal with the multiple ionization of atoms is the statistical energy deposition model [31][32][33][34][35], which is based on the hypothesis that the projectile deposits on the target a certain amount of energy which is statistically shared between the electrons, causing one or more of them to be ionized in a postcollisional step.…”

Section: Introductionmentioning

confidence: 99%

Absolute cross sections for electron loss, electron capture, and multiple ionization in collisions ofC3+with noble gases

et al. 2010

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Absolute charge-state-correlated cross sections for projectile electron loss, electron capture, and target multiple ionization in collisions between C 3+ ions and noble gases have been measured for energies between 1.3 and 3.5 MeV. The data have been compared with other similar absolute cross sections existent in the literature for several projectiles. Calculations for the single-loss−multiple-ionization channel have been performed for the screening mode, using both an extended version of the classical-impulse free-collision model and the plane-wave Born approximation (PWBA), and for the antiscreening mode within the PWBA. The energy dependence of the average number of target active electrons which contribute to the antiscreening has been described by means of a simple function, which is "universal" for noble gases but, in principle, projectile dependent. A method has been developed to obtain the number of active target electrons for each subshell in the high-velocity regime, which presented physically reasonable results. Analyses of the dependences of the single-capture and transfer-ionization (SC and TI, respectively) processes on the projectile charge states showed that, for He, equally charged bare and dressed projectiles have very similar cross sections; the latter thus acting as structureless point charges. A behavior similar to that in the SC has been observed for the pure single ionization of He by projectiles with different charge states and of the other noble gases by singly charged projectiles. It has been shown that the q 2 dependence of the pure-single and total-ionization cross sections, predicted by first-order models, is only valid for high-collision velocities. For slower collisions, the electron capture process becomes more relevant and competes with the ionization channel, a feature which grows in importance as the projectile charge state increases.

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“…It requires the Levine-Louie dielectric response function [12] which makes very important improvements as indicated elsewhere [19]. While the present calculation of the CDW-EIS required some CPU months in our (modest) cluster, notably the SLPA calculation was about 10 5 times faster.…”

Section: Details Of the Calculationmentioning

confidence: 93%

Ionization of He, Ne, Ar, Kr, and Xe by impact ofHe+ions

Miraglia

Gravielle

2010

Phys. Rev. A

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In this article we report ionization cross sections of neutral He, Ne, Ar, Kr, and Xe by impact of He + ions with energies ranging from 25 to 1000 keV/amu. A general theory to deal with dressed projectiles is developed in the context of the Continuum-Distorted-Wave Eikonal-Initial-State approximation. The strategy is based on the use of an effective charge defined in terms of the momentum transfer extracted from the first Born approximation and extensively used in the local plasma approximation to deal with ions in solids. The difference between the actual potential of the projectile and the Coulombic effective one used in the distorted wave functions is treated in first perturbative order. Our results show that the proposed approach gives a very good account of available experiments.

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Many-electron model for multiple ionization in atomic collisions

Cited by 35 publications

References 56 publications

Effectiveness of projectile screening in single and multiple ionization of Ne by B2+

Effectiveness of projectile screening in single and multiple ionization of Ne by B2+

Absolute cross sections for electron loss, electron capture, and multiple ionization in collisions ofC3+with noble gases

Ionization of He, Ne, Ar, Kr, and Xe by impact ofHe+ions

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