Double ionization of He by ion impact: Second-order contributions to the fully differential cross section

López, S. D.; Otranto, S.; Garibotti, C. R.

doi:10.1103/physreva.89.062709

Cited by 6 publications

(2 citation statements)

References 58 publications

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“…Theoretically, double ionization by ion impact has been studied extensively [24][25][26][27][28]. However, the lack of measured FDCS for multiple ionization processes represents a major limitation in sensitively testing theoretical descriptions of the few-body dynamics.…”

Section: Introductionmentioning

confidence: 99%

Electron transfer plus double ionization in slow He2+ + Ar collisions

et al. 2018

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We performed a kinematically complete experiment on double ionization accompanied by single capture in 30 keV/amu He 2+ + Ar collisions. The data were systematically analyzed using three different techniques, namely fully differential cross sections as a function of the electron emission angle of each electron, the correlation function and four-particle Dalitz plots. The data can to a large extent be explained within the independent electron model. However, the correlation function reveals small, but significant effects from correlations in the initial target state. These correlations strongly depend on the interaction between the nuclei of the collision partners. Furthermore, a surprisingly strong correlation between the electron momenta with the momentum transfer, reported earlier, was confirmed.

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Section: Introductionmentioning

confidence: 99%

Electron transfer plus double ionization in slow He2+ + Ar collisions

et al. 2018

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“…An interested reader can find second-order studies in Refs. [3,28,29]. For this contribution we consider it a priority to establish first the first-order Born ground properly.…”

Section: Introductionmentioning

confidence: 99%

Double ionization of helium by proton impact: A generalized-Sturmian approach

et al. 2015

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We present ab initio calculations for the double ionization of helium by fast proton impact, using the generalized-Sturmian-functions methodology and within a perturbative treatment of the projectile-target interaction. The cross-section information is extracted from the asymptotic behavior of the numerical three-body function that describes the emission process. Our goal is to provide benchmark first-order Born fully differential cross sections with which one may investigate the suitability of transition matrices calculated using approximate analytic-type solutions for the double continuum (the choice of effective charges or effective momenta to partially account for the internal target interactions being, to some extent, arbitrary). We also provide fully differential cross sections for the low-ejection-energy regime, which is beyond the suitable range of such perturbative methods. We find, however, that the effective momentum approach allows one to get at least a rough characterization of the most dominant physical process involved. We also compare our calculations with the only available relative experimental set, showing an agreement in shape that can be well understood within the given momentum transfer regime.

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Isomeric signatures in the fragmentation of pyridazine and pyrimidine induced by fast ion impact

Wolff

Luna

Montenegro

2015

The Journal of Chemical Physics

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We present fast proton impact induced fragmentations of pyrimidine and pyridazine as an experimental resource to investigate isomeric signatures. Major isomeric imprints are identified for few fragment ions and differences of more than an order of magnitude for the cross sections of fragments of the same mass were measured. The observation of the molecular structure of these isomers gives no apparent indication for the reasons for such substantial differences. It is verified that the simple displacement of the position of one nitrogen atom strongly inhibits or favors the production of some ionic fragment species. The dependency of the fragmentation cross sections on the proton impact energy, investigated by means of time of flight mass spectroscopy and of a model calculation based in first order perturbation theory, allows us to disentangle the complex collision dynamics of the ionic fragments. The proton-induced fragmentation discriminates rather directly the association between a molecular orbital ionization and the fragment-ions creation and abundance, as well as how the redistribution of the energy imparted to the molecules takes place, triggering not only single but also double vacancy and leads to specific fragmentation pathways.

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Double ionization of He by ion impact: Second-order contributions to the fully differential cross section

Cited by 6 publications

References 58 publications

Electron transfer plus double ionization in slow He2+ + Ar collisions

Electron transfer plus double ionization in slow He2+ + Ar collisions

Double ionization of helium by proton impact: A generalized-Sturmian approach

Isomeric signatures in the fragmentation of pyridazine and pyrimidine induced by fast ion impact

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