Time-dependent close-coupling calculations of the triple-differential cross section for electron-impact ionization of hydrogen

Colgan, J.; Pindzola, M. S.; Robicheaux, F.; Griffin, D. C.; Baertschy, Mark

doi:10.1103/physreva.65.042721

Cited by 82 publications

(50 citation statements)

References 21 publications

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“…[7][8][9][10][11]). Impressive progress has also been made in forming numerical solutions of the full three-body Coulomb system based on non-perturbative approaches, such as exterior complex scaling (ECS) [12], convergent closecoupling (CCC) [13] and time-dependent close-coupling (TDCC) [14]. While the ECS method was only recently applied to describe electron-impact single ionization of helium within a full four-body description of the system [15,16], several calculations describing (e, 2e) impact on helium within the CCC formalism have been published [17][18][19].…”

Section: Introductionmentioning

confidence: 99%

Single ionization of helium by 102 eV electron impact: three-dimensional images for electron emission

Dürr

Dimopoulou

Dorn

et al. 2006

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

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Single ionization of helium by 102 eV electron impact has been studied by measuring the momentum vectors of all final-state particles, i.e., two electrons and the He + ion, with an advanced reaction microscope. Fully differential cross sections for asymmetric scattering geometry, which have been normalized to an absolute scale, have been obtained covering a large range of emission angles for the emitted low-energy (E 15 eV) electron and different scattering angles for the fast electron. Strong electron emission out of the projectile scattering plane is confirmed for electron impact, as was observed before for heavy-ion impact ionization. The data are compared with theoretical predictions from a three-Coulomb wavefunction model, first-order and second-order distortedwave approaches, as well as a convergent close-coupling calculation.

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Section: Introductionmentioning

confidence: 99%

Single ionization of helium by 102 eV electron impact: three-dimensional images for electron emission

Dürr

Dimopoulou

Dorn

et al. 2006

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

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“…In addition to the time-independent CCC and RMPS approaches, we mention the time-dependent close-coupling (TDCC) (19) formulation, as well as "exterior complex scaling" (ECS) (20). Both methods have provided important cross-checks for CCC and RMPS predictions, in particular because they can either avoid or treat in an alternative way the unphysical boundary conditions that 7).…”

Section: Selected Recent Advances In Electron Collisions With Atoms Amentioning

confidence: 99%

Electron collisions with atoms, ions, molecules, and surfaces: Fundamental science empowering advances in technology

Bartschat

Kushner

2016

Proc. Natl. Acad. Sci. U.S.A.

107

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Electron collisions with atoms, ions, molecules, and surfaces are critically important to the understanding and modeling of low-temperature plasmas (LTPs), and so in the development of technologies based on LTPs. Recent progress in obtaining experimental benchmark data and the development of highly sophisticated computational methods is highlighted. With the cesium-based diode-pumped alkali laser and remote plasma etching of Si 3 N 4 as examples, we demonstrate how accurate and comprehensive datasets for electron collisions enable complex modeling of plasma-using technologies that empower our high-technology-based society.electron scattering | close coupling | ab initio | plasmas | kinetic modeling Electron collisions with atoms, ions, molecules, and surfaces are critically important to the understanding and the modeling of laboratory plasmas, astrophysical processes, lasers, and planetary atmospheres, to name just a few examples. In addition to the investigation of naturally occurring phenomena, electron collisions form the basis of a vast array of plasma-using technologies, which continue to empower our high-technology-based society (1). Atomic, molecular, and optical (AMO) physics, the field that encompasses electron-atom and electron-molecule collisions, has made tremendous contributions to our fundamental understanding of nature. Despite the field's longevity, breakthrough developments in atomic collisions continue to be made at the fundamental level of both experiment and theory. The Need for Atomic and Molecular DataIn low-temperature plasmas (LTPs), electron and ion collisions with otherwise unreactive gas and surfaces activate those atoms and molecules through forming excited states, ions, and radicals. Those activated species are then used in applications ranging from microelectronics fabrication (2) to human healthcare (3). The most basic, necessary, and first step in the development of those technologies is the electron or ion impact with the initially unreactive species to produce the activated species. As a result, fundamental AMO physics is closely and beneficially connected to technology development.Examples of experimental progress in advancing the knowledge base for LTPs include, but are certainly not limited to, the "magnetic angle changer" (MAC) (4) and the so-called "reaction microscope" (RM) (5). The MAC makes it possible to carry out measurements of electron impact cross sections in angular regimes that were previously inaccessible because of geometric limitations due to the position of the electron gun. Furthermore, taking advantage of dramatic improvements in detector technology and fast electronics, the RM has enabled unparalleled detailed studies of electron-atom and electron-molecule collision processes over a wide range of parameters (energies, angles), and so provided an extensive database to test theory.At the same time, theoretical and particularly computational advances have made the calculation of data for atomic/molecular structure as well as electron collision processes both r...

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“…Other ways to account for the possibility that two electrons may leave the target after the collision (but only one of the electron wave function fulfills the correct boundary conditions in the CC approach) include "time-dependent close-coupling" (TDCC) [91] and "exterior complex scaling" (ECS) [92]. In the former, a wavepacket is used for the projectile and the formalism is expressed as an initial value rather than a boundary value problem.…”

Section: Uncertainty Estimates For Electron Scattering Calcula-tionsmentioning

confidence: 99%

Uncertainty estimates for theoretical atomic and molecular data

Chung¹,

Braams²,

Bartschat³

et al. 2016

J. Phys. D: Appl. Phys.

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Sources of uncertainty are reviewed for calculated atomic and molecular data that are important for plasma modeling: atomic and molecular structure and cross sections for electron-atom, electron-molecule, and heavy particle collisions. We concentrate on model uncertainties due to approximations to the fundamental many-body quantum mechanical equations and we aim to provide guidelines to estimate uncertainties as a routine part of computations of data for structure and scattering.

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Time-dependent close-coupling calculations of the triple-differential cross section for electron-impact ionization of hydrogen

Cited by 82 publications

References 21 publications

Single ionization of helium by 102 eV electron impact: three-dimensional images for electron emission

Single ionization of helium by 102 eV electron impact: three-dimensional images for electron emission

Electron collisions with atoms, ions, molecules, and surfaces: Fundamental science empowering advances in technology

Uncertainty estimates for theoretical atomic and molecular data

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