Influence of long-lived metastable levels on the electron-impact single ionization of C^{2+}

S. Loch; M. Witthoeft; M. Pindzola; I. Bray; D.V. Fursa; M. Fogle; R. Schuch; P. Glans; C. Ballance; D. Griffin

doi:10.1103/PhysRevA.71.012716

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$Influence of long-lived metastable levels on the electron-impact single ionization of C^{2+}$

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Influence of long-lived metastable levels on the electron-impact single ionization of C^{2+}

S. Loch, M. Witthoeft, M. Pindzola, I. Bray, D.V. Fursa, M. Fogle, R. Schuch, P. Glans, C. Ballance and D. Griffin

Physical Review A - Atomic, Molecular, and Optical Physics, Vol.71(1)

2005

DOI: https://doi.org/10.1103/PhysRevA.71.012716

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Abstract

A joint theoretical and experimental investigation is made of the influence of long-lived metastable levels on the electron-impact single ionization of C2+. It is expected that our electron cyclotron resonance ion source produces a beam with 40% of the C2+ ions in the 1s22s2 1S0 ground level and 60% in the 1s22s2p 3P0,2 excited levels. The comparison of nonperturbative close-coupling calculations with previous single-pass crossed beams and with our multiple-pass storage-ring measurements for the electron-impact ionization of C2+ is consistent with the predicted large metastable fraction. Reasonable agreement is found between the present time-dependent close-coupling, R-matrix with pseudostates, and converged-close-coupling ionization cross-section calculations for the ground and first excited configuration, and experimental measurement, assuming a 60% metastable fraction in the ion beam. Distorted-wave calculations are found to overestimate the ionization cross section from both the ground and metastable terms, compared with nonperturbative calculations, resulting in an overestimation of the resultant total cross section when compared with experiment. It is clear that collisional-radiative modeling of the evolution of atomic plasmas through the Be-like ionization stage will need to take into account the role of both ground and metastable levels.

Details

Title: Influence of long-lived metastable levels on the electron-impact single ionization of C^{2+}
Authors/Creators: S. Loch (Author/Creator) - Auburn University
M. Witthoeft (Author/Creator) - Auburn University
M. Pindzola (Author/Creator) - Auburn University
I. Bray (Author/Creator) - Murdoch University
D.V. Fursa (Author/Creator) - Murdoch University
M. Fogle (Author/Creator) - Stockholm University
R. Schuch (Author/Creator) - Stockholm University
P. Glans (Author/Creator) - Mid Sweden University
C. Ballance (Author/Creator) - Rollins College
D. Griffin (Author/Creator) - Rollins College
Publication Details: Physical Review A - Atomic, Molecular, and Optical Physics, Vol.71(1)
Publisher: The American Physical Society
Identifiers: 991005542194907891
Murdoch Affiliation: Centre for Atomic, Molecular and Surface Physics
Language: English
Resource Type: Journal article

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Collaboration types: Domestic collaboration; International collaboration
Citation topics: 2 Chemistry; 2.15 Physical Chemistry; 2.15.563 Atomic Spectroscopy
Web Of Science research areas: Optics; Physics, Atomic, Molecular & Chemical
ESI research areas: Physics