Absolute charge-exchange cross sections for the interaction between slow<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msup><mml:mrow><mml:mi mathvariant="normal">Xe</mml:mi></mml:mrow><mml:mrow><mml:mi>q</mml:mi><mml:mo>+</mml:mo></mml:mrow></mml:msup></mml:mrow></mml:math><mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mo>(</mml:mo><mml:mn>15</mml:mn><mml:mn /><mml:mo>&lt;~</mml:mo><mml:mi>q</mml:mi><mml:mo>&lt;~</mml:mo><mml:mn>4</

Selberg, N.; Biedermann, C.; Cederquist, H.

doi:10.1103/physreva.56.4623

Cited by 29 publications

(17 citation statements)

References 26 publications

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“…In the case of highly charged projectiles, however, the importance of this molecular behavior is somewhat diminished [25]. Secondly, the CTMC data from [13] are for single electron capture, whereas in slow HCI-atom collisions the cross sections for multiple electron capture are in fact significant [26]. Indeed it has been shown that multiple electron capture plays an important role in the shaping of charge exchange emission spectra [12,27].…”

Section: Hardness Ratios For Armentioning

confidence: 99%

Energy dependence of angular momentum capture states in charge exchange collisions between slow highly charged argon ions and argon neutrals

et al. 2008

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K-shell x-ray emission measurements of electron capture into Rydberg states of Ar 17+ and Ar 18+ions are carried out as a function of collision energy in order to investigate the energy dependence of angular momentum capture states in slow charge exchange collisions. The highly charged ions are produced using an Electron Beam Ion Trap and extracted onto an external argon gas target. A retardation assembly in the beamline allows projectile energies from ∼2 keV/amu down to ∼5 eV/amu to be selected. For decreasing collision energies a shift to electron capture into low orbital angular momentum capture states is observed. Comparative K-shell x-ray emission measurements of electron capture by Ar 17+ and Ar 18+ ions from background gas in the trap are also presented. The results of the trapping experiments are in discrepancy with those obtained using extracted ions and possible explanations are discussed.

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Section: Hardness Ratios For Armentioning

confidence: 99%

Energy dependence of angular momentum capture states in charge exchange collisions between slow highly charged argon ions and argon neutrals

et al. 2008

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“…Collisions of slow Xe q+ (15 q 43) with He, Ar, and Xe targets at velocities around 0.2 a.u. were investigated by Selberg et al [14]. Their results showed that σ 2 /σ 1 is always less than 1.…”

Section: A Ratios Of Electron-removal Cross Sectionsmentioning

confidence: 94%

“…* w.chen@gsi.de Most of the experiments carried out in the past focus on charge transfer between ions and gaseous targets. Measurements of total charge exchange [22][23][24][25], recoil production [13][14][15][26][27][28], Auger electrons [29][30][31][32], photon emission [33][34][35], and their coincidence have been reported. Groh et al's measurement [36] shows that at sufficiently low energy, transfer ionization [see Eq.…”

Section: Introductionmentioning

confidence: 97%

“…The result exhibits an onset of ionization around q = 13 and follows approximate q 2 behavior at higher q, but the ionization process is still two orders of magnitude smaller than the capture process. The absolute cross sections of Xe q+ -(He, Ar, Xe) collisions were measured by Selberg et al [14]. Based on a large data set, they proposed a set of semiempirical scaling laws [39], which also give a good agreement with other HCI-gas measurements [15,40].…”

Section: Introductionmentioning

confidence: 99%

“…This model takes into consideration the probability of electrons staying in the target or being transferred to projectile ions during the quasimolecular state. ECOB and MCBM were verified and compared with many experimental results [13][14][15]. For collisions at medium and high energies where impact ionization occurs [16,17], different models were developed to describe the mechanism, such as the classic trajectory Monte Carlo model (CTMC) [18].…”

Section: Introductionmentioning

confidence: 99%

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Charge transfer of slow highly charged xenon ions in collisions with magnesium atoms

et al. 2013

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We report an experimental study of the charge-transfer process in collisions of Xe q+ ions (16 q 20) with magnesium atoms at an energy of 5.5q keV. With charge-selective and time-coincidence techniques, we separated the pure capture and capture accompanied by transfer-ionization processes. The experimental data indicate that the magnesium target is around two times more likely to lose two electrons than one in the collision. This finding is very different compared to the calculation based on the extended classic over-the-barrier model. The Xe q+ -Mg collision also behaves very differently from "traditional" collisions between highly charged ions and noble gases. We suggest a one-step dielectronic mechanism for the capture process. The data also show that autoionization dominates the relaxation process after the capture, and fluctuation of the autoionization fraction versus the projectile charge state indicates that for the relaxation processes, the projectile core structure plays a more important role than the detailed characteristics of the projectile states where the target electrons are initially captured.

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Extension of CTMC Calculations to Multielectron Systems

Frémont

2021

Springer Series on Atomic, Optical, and Plasma Physics

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Due to the quality of a large number of results obtained with the CTMC, method for collisions involving H and He targets, it is obviously tempting to extend the method to multielectronic targets. The simplest target to use seems to be Li, which has two electrons in the 1s orbital and a less bound electron on the 2s shell. Then, the method is extended to multielectronic targets such as Ne or Ar. Interest and MotivationDue to the quality of a large number of results obtained with the CTMC method for collisions involving H and He targets, it is obviously tempting to extend the method to multielectronic targets. The simplest target to use seems to be Li, which has two electrons in the 1s orbital and a less bound electron on the 2s shell. Rather than reasoning like this, we will study the processes according to the energy of the active electrons. We are going to distinguish the targets whose active electrons are energetically little bounded to the nucleus in comparison with the other electrons. This is true for example for the alkaline elements (Li, Na, K, Cs), and for the atoms for which an electron is initially in a highly excited state. For these elements, apart the active electron, the other electrons can be, in first approximation, considered as frozen (Fig. 5.1).In the case where the targets have active electrons are on similar shells, such as Ne, Ar, Kr or Xe, the problem is more complex, because electrons on a same orbital cannot be considered anymore as independent. Nevertheless, to calculate total cross sections, independent electron models (IEM) are efficient, as well as scaling law. One has to be careful, because even though scaling laws and IEM are really useful, they give rise to absolute results with an uncertainty that can be larger than 10%. This value is considerable when problems involving a huge number of particles have to be solved.Before discussing results obtained with the CTMC method, two examples using scaling laws derived from classical results, and the Classical Over Barrier Model, will be given.

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Absolute charge-exchange cross sections for the interaction between slowXeq+(15<~q<~4

Cited by 29 publications

References 26 publications

Energy dependence of angular momentum capture states in charge exchange collisions between slow highly charged argon ions and argon neutrals

Energy dependence of angular momentum capture states in charge exchange collisions between slow highly charged argon ions and argon neutrals

Charge transfer of slow highly charged xenon ions in collisions with magnesium atoms

Extension of CTMC Calculations to Multielectron Systems

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