Electron-impact ionization of atomic ions in the W isonuclear sequence

Journal Article · Tue Nov 15 04:00:00 EST 2005 · Physical Review. A

DOI:https://doi.org/10.1103/PHYSREVA.72.0· OSTI ID:20786519

Loch, S D; Ludlow, J A; Pindzola, M S; Whiteford, A D; Griffin, D C ^[1]

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1. Department of Physics, Auburn University, Auburn, Alabama 36849 (United States)

Electron-impact ionization cross sections for all atomic ions in the W isonuclear sequence are calculated using a variety of theoretical methods. For the direct ionization process, a semirelativistic configuration-average distorted-wave method is used for low to moderately charged ions, while a fully relativistic subconfiguration-average distorted-wave method is used for highly charged ions. For the indirect ionization process of excitation autoionization, a semirelativistic configuration-average distorted-wave method is used for the bulk of the transitions, but a semirelativistic level-resolved distorted-wave method is used for selective strong transitions that may straddle the ionization threshold. For moderately charged ions it is important to include radiation damping of the excitation-autoionization process through explicit calculation of autoionization branching ratios. Checks are made on the theoretical predictions by comparison with available crossed-beams experimental measurements, which only exist for low stages of ionization. The ionization cross sections for the entire W isonuclear sequence are converted to temperature-dependent rate coefficients and put in a collisional-radiative format that should prove useful in modeling laboratory plasmas that contain W impurities.

• OSTI ID: 20786519
• Journal Information: Physical Review. A, Journal Name: Physical Review. A Journal Issue: 5 Vol. 72; ISSN 1050-2947; ISSN PLRAAN
• Country of Publication: United States
• Language: English

Related Subjects

74 ATOMIC AND MOLECULAR PHYSICS
ATOMIC IONS
AUTOIONIZATION
BRANCHING RATIO
COMPARATIVE EVALUATIONS
CORRECTIONS
CROSS SECTIONS
DAMPING
DISTORTED WAVE THEORY
ELECTRON-ION COLLISIONS
ELECTRONS
EXCITATION
PLASMA
PLASMA IMPURITIES
RELATIVISTIC RANGE
SIMULATION
TEMPERATURE DEPENDENCE
TUNGSTEN