Effectiveness of projectile screening in single and multiple ionization of Ne by B<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:msup><mml:mrow /><mml:mrow><mml:mn>2</mml:mn><mml:mo>+</mml:mo></mml:mrow></mml:msup></mml:math>

Wolff, W.; Luna, H.; Santos, A. C. F.; Montenegro, E. C.; Dubois, R.; Montanari, C. C.; Miraglia, J. E.

doi:10.1103/physreva.84.042704

Cited by 18 publications

(35 citation statements)

References 37 publications

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“…In tables 2, 3 and 4 we display the branching ratios used in this work for PCI of 0-6 electrons and all the shells of Ne, Ar, Kr and Xe. These values have already been employed with good results in previous calculations of MI of rare gases by protons, antiprotons and different positive ions [34][35][36][37][38]62]. A detailed discussion on the experimental branching ratios and the comparison of the different data available in the literature is included in [37].…”

Section: Nementioning

confidence: 99%

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: Nementioning

confidence: 99%

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

Montanari

Miraglia

2014

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

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“…Working within the IPM, Montenegro and collaborators [54,55] and Kirchner and co-workers [56] proposed the inclusion of PCI in a semi-empirical way using experimental data of charge state distribution after single photoionization. This proposal boosted new experimental and theoretical research on this subject [57][58][59][60][61][62][63][64][65][66][67][68][69].…”

Section: Introductionmentioning

confidence: 99%

Antiproton, proton and electron impact multiple ionization of rare gases

Montanari¹,

Miraglia²

2012

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

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We present a study on multiple ionization of Ne, Ar, Kr and Xe by antiproton, proton and electron impact. Four different aspects are involved in this work. First, the theoretical calculations of ionization probabilities by impact of antiprotons and protons, in an extended energy region (25 keV to 10 MeV), using the continuum distorted-wave eikonal initial state approximation and the first Born approximation. Second, the inclusion of Auger-type post-collisional contributions through experimental photoionization branching ratios. These contributions to multiple ionization are very important in the high-energy region. Third, the comparison with the available experimental data on multiple ionization by protons and antiprotons in the extended energy range, and by electrons for high-impact velocities, where proton, antiproton and electron impact results are expected to converge. It is also the energy region where direct ionization does not explain the experimental results, and the post-collisional ionization is the main contribution to multiple ionization. And fourth, total ionization cross sections are calculated and compared with the antiproton, proton and electron experimental data, showing the importance of Auger-type multiple ionization for heavy targets even at the level of total cross sections. Gross and count cross sections are scrutinized.

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“…This method consists of measuring the growth rate of the emergent fraction of the incident beam, which undergoes charge exchanging collisions as a function of the gas target thickness at pressures low enough to ensure a single collision regime. The experimental procedures, cares and analysis performed in this work were the same used and described in detail by Wolff et al 13 The spatial separation on the position sensitive detector of the different projectile charge states emerging from the cell was made by the two electrostatic parallel plate analyzers, as already described in Ref. 14.…”

Section: B Absolute Total Charge Exchange Cross Sectionsmentioning

confidence: 99%

“…Despite the fact that the multiple ionization of rare gas targets in collision with ions has been extensively investigated over the past several decades, 1 it still continues to pose experimental [2][3][4][5][6][7][8][9][10][11][12][13][14][15] and theoretical challenges. 13,[16][17][18][19][20] For example, studies focused on the comparison between bare or partially stripped ions shed light on the role of the projectile effective charge state in direct multiple ionization processes of rare noble gases. 13 In this work, the total and partial absolute pure ionization and charge exchange cross sections were obtained by combining two techniques: (1) the growth-rate method for the measurement of the total charge exchanging cross sections based on a gas cell setup, and (2) the time-of-flight mass spectrometry and coincidence technique using an effusive gas jet in the molecular flow regime as a target.…”

Section: Introductionmentioning

confidence: 99%

“…13,[16][17][18][19][20] For example, studies focused on the comparison between bare or partially stripped ions shed light on the role of the projectile effective charge state in direct multiple ionization processes of rare noble gases. 13 In this work, the total and partial absolute pure ionization and charge exchange cross sections were obtained by combining two techniques: (1) the growth-rate method for the measurement of the total charge exchanging cross sections based on a gas cell setup, and (2) the time-of-flight mass spectrometry and coincidence technique using an effusive gas jet in the molecular flow regime as a target. The gas target absolute pressure in set-ups based on a differentially gas cell can be measured directly with a capacitive manometer gauge.…”

Section: Introductionmentioning

confidence: 99%

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Electron-recoil ion and recoil ion-projectile coincidence techniques applied to obtain absolute partial collision cross sections

Wolff

Souza

Tavares

et al. 2012

Review of Scientific Instruments

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We present in detail an alternative experimental set-up and data analysis, based on the electron-recoil ion and recoil ion-projectile coincidence techniques, that enable the measurement of partial pure ionization and partial charge exchange cross sections for an effusive gas jet set-up, where the absolute target density and recoil ion efficiency cannot be measured directly. The method is applied to the ionization of helium atoms due to collision with partially stripped C(3 +) projectiles. In order to check the method, the results are compared to data available in the literature where the target density and recoil ion detection efficiency were measured directly. The pure ionization channel is compared to the electron capture channel.

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

Cited by 18 publications

References 37 publications

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

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

Antiproton, proton and electron impact multiple ionization of rare gases

Electron-recoil ion and recoil ion-projectile coincidence techniques applied to obtain absolute partial collision cross sections

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