Inclusive and exclusive cross sections for multiple ionization by fast, highly charged ions in the independent-electron approximation

Ben‐Itzhak, I.; Gray, Tom J.; Legg, J.C.; McGuire, J. H.

doi:10.1103/physreva.37.3685

Cited by 46 publications

(17 citation statements)

References 31 publications

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“…Even though the total electron-removal cross sections from CO and Ne differ systematically, the two targets have similar relative cross sections for removal of a few electrons. This is in agreement with independent-electron approximation calculations [18], which predict that for collisions where multiple ionization is significant, the relative ionization cross sections are independent of the number of equivalent electrons. We intend to further investigate this trend by measuring other targets with different numbers of valence electrons.…”

Section: Introductionsupporting

confidence: 91%

Multiple-electron removal and molecular fragmentation of CO by fastF4+impact

1993

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Multiple-electron removal from and molecular fragmentation of carbon monoxide molecules caused by collisions with 1-MeV/amu F + ions were studied using the coincidence time-of-Aight technique. In these collisions, multiple-electron removal of the target molecule is a dominant process. Cross sections for the different levels of ionization of the CO molecule during the collision were determined. The relative cross sections of ionization decrease with increasing number of electrons removed in a similar way as seen in atomic targets. This behavior is in agreement with a two-step mechanism, where erst the molecule is ionized by a Franck-Condon ionization and then the molecular ion dissociates. Most of the highly charged intermediate states of the molecule dissociate rapidly. Only CO+ and CO + molecular ions have been seen to survive long enough to be detected as molecular ions. The relative cross sections for the different breakup channels were evaluated for collisions in which the molecule broke into two charged fragments as mell as for collisions where only a single charged molecular ion or fragment were produced. The average charge state of each fragment resulting from CO~+~C'++0'+ breakup increases with the number of electrons removed from the molecule approximately following the relationship i = j=g/2 as long as K-shell electrons are not removed. This does not mean that the charge-state distribution is exactly symmetric, as, in general, removing electrons from the carbon fragment is slightly more likely than removing electrons from the oxygen due to the difference in binding energy. The cross sections for molecular breakup into a charged fragment and a neutral fragment drop rapidly with an increasing number of electrons removed.PACS number(s): 34.50.s, 35.80.+ s, 34.90.+ q

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Section: Introductionsupporting

confidence: 91%

Multiple-electron removal and molecular fragmentation of CO by fastF4+impact

1993

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“…It also includes the SCA calculation results of Ref. [6] and the experimental data of Ref. projectiles energy E and charge q.…”

Section: Modelmentioning

confidence: 99%

“…However, its application to more complex molecules is limited by its consuming. In a perturbative regime, the first-order semi-classical approximation (SCA) model [6] and statistical energy deposition (SED) model [7] [8] can give a reasonable description of multiple ionization mechanism. However, when it comes to a strong coupling regime (q/v > 1), remarkable deviations from the first-order results have been found.…”

Section: Introductionmentioning

confidence: 99%

Multiple Ionization Cross Sections of Ne and CO Induced by Very High-<i>q</i> Fast Projectiles (<i>q/v</i> > 1)

Zhou¹,

Wang²,

Li³

et al. 2018

JAMP

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In this paper, we extend our previous work of classical over barrier ionization (COBI) model to study the multiple ionization cross section of Ne and CO molecule collided by very high-q fast projectiles(q/v > 1). The model gives similar results to the independent-electron-approximation calculation and is in good agreement with experimental data. The very small computational time required makes it a good candidate for studying the multiple ionization of complex molecules under high linear energy transfers.

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“…Recently, new TL calculations were performed in the IPM by Sulik et al [19] for both H 2 and He targets using exclusive [20] unitarized [21] impact parameter b-dependent probabilities, P(b). Electron transfer probabilities were computed using the continuum distorted wave (CDW) approach [22], while 1s loss (projectile ionization) probabilities were calculated using a semiclassical approximation (SCA) code [23] for the production of an uncoupled determinant state…”

Section: Recent Tl Calculationsmentioning

confidence: 99%

“…To closer simulate the molecular H 2 target used in the experiments, the CDW and SCA calculations were performed for an effective H atom (with Z * t = 1.062) [24] including an averaging over all the orientations of the H 2 molecular axis. For the capture probability, P 2p m T , the term in large curly brackets represents the exclusive probability [20] that there is no other capture allowed from the other X 1s electron to the oxygen ion. In this work "any shell" represents an additional capture to oxygen.…”

Section: Recent Tl Calculationsmentioning

confidence: 99%

Production of 1s2s2p4P states by transfer-loss cascades in O5+ collisions with he and H2 targets

Zouros¹,

Sulik²,

Gulyás³

et al. 2006

Braz. J. Phys.

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Single differential cross-sections for transfer-loss (TL) leading to the production of O 5+ (1s2s 3 S)nl 4 L states were computed for 0.2-1.2 MeV/u collisions of O 5+ (1s 2 2s) ions with He and H 2 targets. At these collision energies, 1s loss is significant and electron transfer to n = 3 − 4 levels is dominant. Furthermore, due to spin conservation, quartet states can only be populated by TL. Within the independent particle model (IPM), the probability of 1s electron loss from O 5+ (1s 2 2s) projectiles was calculated using the semi-classical approach, while the probability for electron transfer to the O 5+ (1s2s 3 S)nl 4 L states (n ≥ 2) was computed using the continuum distorted wave (CDW) approximation. The majority of states with n > 2 can be assumed to have sufficient time to eventually decay with an almost 100% probability to the long-living metastable 1s2s2p 4 P level via a much faster sequence of electric dipole transitions, thus establishing an upper limit to such cascade contributions. The inclusion of this cascade feeding is found to lead to a strong enhancement in the production of the 1s2s2p 4 P states, particularly for collisions with the H 2 target, thus reducing dramatically the existing two-order of magnitude discrepancy between older TL calculations (for n = 2 only) and existing zero-degree Auger projectile electron spectroscopy measurements.

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Inclusive and exclusive cross sections for multiple ionization by fast, highly charged ions in the independent-electron approximation

Cited by 46 publications

References 31 publications

Multiple-electron removal and molecular fragmentation of CO by fastF4+impact

Multiple-electron removal and molecular fragmentation of CO by fastF4+impact

Multiple Ionization Cross Sections of Ne and CO Induced by Very High-<i>q</i> Fast Projectiles (<i>q/v</i> > 1)

Production of 1s2s2p4P states by transfer-loss cascades in O5+ collisions with he and H2 targets

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Inclusive and exclusive cross sections for multiple ionization by fast, highly charged ions in the independent-electron approximation

Cited by 46 publications

References 31 publications

Multiple-electron removal and molecular fragmentation of CO by fastF4+impact

Multiple-electron removal and molecular fragmentation of CO by fastF4+impact

Multiple Ionization Cross Sections of Ne and CO Induced by Very High-&lt;i&gt;q&lt;/i&gt; Fast Projectiles (&lt;i&gt;q/v&lt;/i&gt; &gt; 1)

Production of 1s2s2p4P states by transfer-loss cascades in O5+ collisions with he and H2 targets

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Multiple Ionization Cross Sections of Ne and CO Induced by Very High-<i>q</i> Fast Projectiles (<i>q/v</i> > 1)