Multiple ionization of rare gases by hydrogen-atom impact

Sarkadi, L.; Herczku, Péter; Kovács, Sándor; Kövér, Á.

doi:10.1103/physreva.87.062705

Cited by 10 publications

(15 citation statements)

References 29 publications

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“…Absolute values were obtained by measuring total or single [46,47]. Experimental data: for electron-impact, Schram et al [9], Nagy et al [12], Krishnakumar et al [13], Syage [14], ♦ Rejoub et al [15], McCallion et al [16], Kobayashi et al [17], hollow Straub et al [18], Almeida et al [19], Liebius et al [20], cross-circle 10 keV value by Singh et al [21]; for proton-impact, DuBois [89]; DuBois et al [90], • Andersen et al [91], Cavalcanti et al [33,92], Haugen et al [93], Gonzalez et al [94], for Ne, Ar and Kr Sarkadi et al [95], for Xe Manson and DuBois [96]. [9], Krishnakumar et al [13],…”

Section: Resultsmentioning

confidence: 99%

“…At low impact energies the electron-electron correlation is important. We use IPM so we do not expect the present results to describe the ionization processes as we approach the [10], Rapp and Eglander-Golden [50], Nagy et al [12], Krishnakumar et al [13], ♦ Rejoub et al [15], Syage [14]; for proton-impact, DuBois [89], DuBois et al [90], Rudd et al [97], Cavalcanti et al [92], Sarkadi et al [95]. [10], Rapp and Eglander-Golden [50], Nagy et al [12], Krishnakumar et al [13], ♦ Rejoub et al [15], Syage [14]; for proton-impact, Cavalcanti et al [92], Rudd et al [97], Manson et al [96].…”

Section: Multiple-ionization Cross Sections Including Pcimentioning

confidence: 99%

“…Curves, present results for gross cross sections including PCI, by electron-impact (orange solid-line), and by proton-impact (blue dotted-line). Experimental data: for electron-impact, Schram et al [10], Rapp and Eglander-Golden [50], Nagy et al [12], Krishnakumar et al [13], ♦ Rejoub et al [15]; for proton-impact, DuBois [89], DuBois et al [90], Rudd et al [97], Cavalcanti et al [33], Sarkadi et al [95]. [12], Krishnakumar et al [13], ♦ Rejoub et al [15], hollow Straub et al [18], McCallion et al [16], Syage [14], Sorokin et al [54] (count cross sections); for proton-impact, DuBois et al [90], Rudd et al [97], Cavalcanti et al [92], Sarkadi et al [95].…”

Section: Multiple-ionization Cross Sections Including Pcimentioning

confidence: 99%

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Electron-impact multiple ionization of Ne, Ar, Kr and Xe

Montanari

Miraglia

2014

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

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This work describes the multiple ionization cross sections of rare gases by electron-impact. We pay special attention to the high energy region (0.1-10 keV) where the direct ionization is a minor contribution and the post-collisional electron emission dominates the final target charge state. We report here electron-impact single to sextuple ionization cross sections and total ionization cross sections including direct and post-collisional processes, even in the total values. We use the continuum distorted wave and the first Born approximations adapted to describe light-particle impact, i.e. energy, mass and trajectory corrections are incorporated, the latter by considering the electron-target potential and by using the Abel transformation. Auger-type post-collisional contributions are included in the multinomial expansion through experimental branching ratios after single ionization events. Tabulations of these experimental branching ratios for all the orbitals of the four targets are included. Present results are compared with the large amount of electron-impact experimental data available. We have obtained a good description of the multiple-ionization measurements at high energies, where the post-collisional ionization dominates. At intermediate energies, our theoretical results show the correct tendency, with the electron-impact ionization cross sections being far below the proton-impact ones.

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Section: Resultsmentioning

confidence: 99%

Section: Multiple-ionization Cross Sections Including Pcimentioning

confidence: 99%

Section: Multiple-ionization Cross Sections Including Pcimentioning

confidence: 99%

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Electron-impact multiple ionization of Ne, Ar, Kr and Xe

Montanari

Miraglia

2014

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

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“…In close collisions, however, screening effects are less important. Therefore multiple-ionization cross sections are closer to those for bare projectiles [1,[30][31][32]. For dressed projectiles, multiple electron scattering at lower energies [9][10][11][12][13] and dielectronic (antiscreening) effects [33] at higher energies may also provide observable contributions to the spectra.…”

Section: Introductionmentioning

confidence: 88%

Ionization of small molecules induced byH+, He+, and
Kovács
¹
,
Herczku
²
,
Juhász
³

et al. 2016
Phys. Rev. A
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We report the energy and angular distribution of ejected electrons from CH 4 and H 2 O molecules impacted by 1 MeV H + , He + , and 650 keV N + ions. Spectra were measured at different observation angles, from 2 to 2000 eV. The obtained absolute double-differential electron-emission cross sections (DDCSs) were compared with the results of classical trajectory Monte Carlo (CTMC) and continuum distorted wave, eikonal initial state (CDW-EIS) calculations. For the bare H + projectile both theories show remarkable agreement with the experiment at all observed angles and energies. The CTMC results are in similarly good agreement with the DDCS spectra obtained for impact by dressed He + and N + ions, where screening effects and electron loss from the projectile gain importance. The CDW-EIS calculations slightly overestimate the electron loss for 1 MeV He + impact, and overestimate both the target and projectile ionization at low emitted electron energies for 650 keV N + impact. The contribution of multiple electron scattering by the projectile and target centers (Fermi shuttle) dominates the N + -impact spectra at higher electron energies, and it is well reproduced by the nonperturbative CTMC calculations. The contributions of different processes in medium-velocity collisions of dressed ions with molecules are determined.

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“…In such close collisions the effective charge exceeds the ionic charge for a short time period [29], and the target feels strong perturbation. Such collision events can produce remarkable double-and multiple-ionization yields even for neutral-atom impact [30]. Though their contributions may remain low compared with single ionization, they are responsible for the production of the majority of the fragments in the 3-100-eV fragment energy range.…”

Section: Introductionmentioning

confidence: 99%

Dissociative ionization of the H2O molecule induced by medium-energy singly charged projectiles

et al. 2017

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We report on the fragmentation of the water molecule by 1 MeV H + and He + and 650 keV N + ion impact. The fragment-ion energy spectra were measured by an electrostatic spectrometer at different observation angles. The obtained double-differential fragmentation cross sections for N + are found to be more than an order of magnitude higher than that for H + . The relative ratios of the fragmentation channels are also different for the three projectiles. Additional fragmentation channels were observed in the spectra for He + and for N + impact, which are missing in the case of H + . From the analysis of the kinetic energy of the fragments, the maximum observed degree of ionization was found to be q max = 3, 4, and 5 for H + , He + , and N + impact, respectively. Absolute multiple-ionization cross sections have been determined. They are compared with the predictions of the classical trajectory Monte Carlo and continuum-distorted-wave eikonal-initial-state theories. At lower degrees of ionization, theories provide reasonable agreement with experiment. The systematic overestimation of the cross section by the theories towards higher degrees of ionization indicates the failure of the independent particle model.

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Multiple ionization of rare gases by hydrogen-atom impact

Cited by 10 publications

References 29 publications

Electron-impact multiple ionization of Ne, Ar, Kr and Xe

Electron-impact multiple ionization of Ne, Ar, Kr and Xe

Ionization of small molecules induced byH+, He+, and
Kovács
¹
,
Herczku
²
,
Juhász
³

et al. 2016
Phys. Rev. A
Self Cite

Dissociative ionization of the H2O molecule induced by medium-energy singly charged projectiles

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Multiple ionization of rare gases by hydrogen-atom impact

Cited by 10 publications

References 29 publications

Electron-impact multiple ionization of Ne, Ar, Kr and Xe

Electron-impact multiple ionization of Ne, Ar, Kr and Xe

Ionization of small molecules induced byH+, He+, andKovács1, Herczku2, Juhász3 et al. 2016Phys. Rev. ASelf Cite

Dissociative ionization of the H2O molecule induced by medium-energy singly charged projectiles

Contact Info

Product

Resources

About

Ionization of small molecules induced byH+, He+, and
Kovács
¹
,
Herczku
²
,
Juhász
³

et al. 2016
Phys. Rev. A
Self Cite