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Influence of long-lived metastable levels on the electron-impact single ionization of C2+
Vise andre og tillknytning
2005 (engelsk)Inngår i: Physical Review A. Atomic, Molecular, and Optical Physics, ISSN 1050-2947, E-ISSN 1094-1622, Vol. 71, nr 1, s. 012716-1Artikkel i tidsskrift (Fagfellevurdert) Published
Abstract [en]

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 1s(2)2s(2) S-1(0) ground level and 60% in the 1s(2)2s2p P-3(0,2) 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 configurations 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.

sted, utgiver, år, opplag, sider
2005. Vol. 71, nr 1, s. 012716-1
Emneord [en]
CLOSE-COUPLING CALCULATIONS, BE-LIKE IONS, R-MATRIX, HYDROGEN SCATTERING, CROSS-SECTIONS, DIELECTRONIC RECOMBINATION, LI-LIKE, EXCITATION, ATOMS, STATE
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Identifikatorer
URN: urn:nbn:se:miun:diva-3155DOI: 10.1103/PhysRevA.71.012716ISI: 000227283300089Lokal ID: 3091OAI: oai:DiVA.org:miun-3155DiVA, id: diva2:28187
Tilgjengelig fra: 2008-09-30 Laget: 2008-09-30 Sist oppdatert: 2017-12-12bibliografisk kontrollert

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