Electron-impact excitation of Co{sup 2+}

Journal Article · Thu Oct 01 04:00:00 EDT 1998 · Physical Review A

DOI:https://doi.org/10.1103/PhysRevA.58.2920· OSTI ID:659314

Shaw, J A; Pindzola, M S ^[1]; Badnell, N R ^[2]; Griffin, D C ^[3]

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1. Department of Physics, Auburn University, Auburn, Alabama 36849 (United States)
2. Department of Physics and Applied Physics, University of Strathclyde, Glasgow G4 0NG (United Kingdom)
3. Department of Physics, Rollins College, Winter Park, Florida 32789 (United States)

Electron-impact excitation cross sections and Maxwellian-averaged rate coefficients are calculated from the ground 3d{sup 7}thinsp{sup 4}F to the first 3d{sup 7}thinsp{sup 4}P and the second 3d{sup 7}thinsp{sup 2}G excited terms in Co{sup 2+} in close coupling with 8 and 27 terms; much larger transition arrays were first explored in a distorted-wave approximation. Both transitions are important elements of the emission spectrum of type Ia supernovae. We find that the two excitations are dominated by autoionizing resonances attached to higher-lying excited terms in the 3d{sup 7}, 3d{sup 6}4s, 3d{sup 6}4p, and 3d{sup 6}4d configurations. Those LS terms that are strongly excited from the ground 3d{sup 7}thinsp{sup 4}F, as found by distorted-wave calculations, are included in a large R-matrix calculation using asymptotics based on multichannel quantum defect theory. {copyright} {ital 1998} {ital The American Physical Society}

• OSTI ID: 659314
• Journal Information: Physical Review A, Journal Name: Physical Review A Journal Issue: 4 Vol. 58; ISSN 1050-2947; ISSN PLRAAN
• Country of Publication: United States
• Language: English

Related Subjects

66 PHYSICS
CATIONS
COBALT
COBALT IONS
DISTORTED WAVE THEORY
ELECTRON-ION COLLISIONS
EXCITATION
EXCITED STATES
L-S COUPLING