Electron-impact excitation of argon at intermediate energies

Zatsarinny, Oleg; Wang, Yang; Bartschat, Klaus

doi:10.1103/physreva.89.022706

Cited by 84 publications

(94 citation statements)

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“…This extreme sensitivity seems to be a general trend in atoms with outer p shells; it agrees well with our previous findings in calculations for carbon, fluorine, and neon atoms. As explained in a recent paper [47], the principal physical reason for this result is the stability of the elastic and grand-total cross sections against changes in the theoretical models. While this also implies stability of the combined cross section for excitation plus ionization, the distribution between the two possibilities can vary substantially.…”

Section: Discussionmentioning

confidence: 80%

B-splineR-matrix-with-pseudostates calculations for electron-impact excitation and ionization of nitrogen

2014

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The B-spline R-matrix-with-pseudostates (BSR) method is employed to treat electron collisions with nitrogen atoms. Predictions for elastic scattering, excitation, and ionization are presented for all transitions between the lowest 21 states of nitrogen in the energy range from threshold to 120 eV. The structure description has been further improved compared to a previous BSR calculation by Tayal and Zatsarinny [J. Phys. B 38, 3631 (2005)]. This change in the structure model, together with the inclusion of a large number of pseudostates in the close-coupling expansion, has a major influence on the theoretical predictions, especially at intermediate energies, where many of the excitation cross sections are reduced significantly. Ionization cross sections for the ground and metastable initial states are also provided. Finally, we carry out an accurate ab initio treatment of the prominent shape resonance just above the elastic threshold.

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Section: Discussionmentioning

confidence: 80%

B-splineR-matrix-with-pseudostates calculations for electron-impact excitation and ionization of nitrogen

2014

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“…Fig. 8 shows results from a detailed study using the BSR approach (27). Looking at the top two rows, we see the enormous effect of accounting for coupling to both high-lying discrete states and the ionization continuum on the results for these transitions from the ground state to the first four excited states.…”

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.

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110

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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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“…Cross [188][189][190] are compared with predictions from nonrelativistic CCC [191] and RMPS [192] [193]). Figure 5 is an example of a systematic study regarding the convergence of the closecoupling expansion [193].…”

Section: B Electron -Atom/ion Collisionsmentioning

confidence: 99%

“…Figure 5 is an example of a systematic study regarding the convergence of the closecoupling expansion [193]. In this particular implementation, the resulting equations are solved using the so-called "B-Spline R-matrix with Pseudo-States" (BSRMPS) approach.…”

Section: B Electron -Atom/ion Collisionsmentioning

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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Electron-impact excitation of argon at intermediate energies

Cited by 84 publications

References 50 publications

B-splineR-matrix-with-pseudostates calculations for electron-impact excitation and ionization of nitrogen

B-splineR-matrix-with-pseudostates calculations for electron-impact excitation and ionization of nitrogen

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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