Electron-impact excitation of carbon

Journal Article · Fri Apr 01 04:00:00 EST 2005 · Physical Review. A

DOI:https://doi.org/10.1103/PhysRevA.71.042702· OSTI ID:20653303

Zatsarinny, Oleg; Bartschat, Klaus; Bandurina, Ludmila; Gedeon, Viktor ^[1]

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1. Department of Physics and Astronomy, Drake University, Des Moines, Iowa 50311 (United States)

The B-spline R-matrix method is used to investigate the electron-impact excitation of neutral carbon over an energy range from threshold to 60 eV. A multiconfiguration Hartree-Fock method with nonorthogonal orbitals is employed to generate an accurate representation of the target wavefunctions. The present close-coupling expansion includes the bound and autoionizing states of neutral carbon derived from the 1s{sup 2}2s{sup 2}2p{sup 2}, 1s{sup 2}2s{sup 2}2p3l (l=0,1,2), 1s{sup 2}2s{sup 2}2p4s, 1s{sup 2}2s2p{sup 3}, and 1s{sup 2}2p{sup 4} configurations, plus eight pseudostates to fully account for the polarizability of the ground state of atomic carbon. Cross sections and effective collision strengths are presented for important transitions from the ground state 2p{sup 2} {sup 3}P, and the metastable 2p{sup 2} {sup 1}D and {sup 1}S states. Our predictions for the cross sections show significant discrepancies with those from previous calculations carried out with the standard R-matrix approach in a similar scattering model [Dunseath et al., J. Phys. B 30, 277 (1997) ]. These discrepancies are mostly due to the different target descriptions, with the present one giving overall superior agreement with experiment for energy levels and oscillator strengths. The excitation cross sections exhibit prominent resonance structures in the low-energy region. The energy positions, widths, and classifications for the detected resonances are presented.

• OSTI ID: 20653303
• Journal Information: Physical Review. A, Journal Name: Physical Review. A Journal Issue: 4 Vol. 71; ISSN 1050-2947; ISSN PLRAAN
• Country of Publication: United States
• Language: English

Related Subjects

74 ATOMIC AND MOLECULAR PHYSICS
ATOM COLLISIONS
AUTOIONIZATION
BOUND STATE
CARBON
COUPLING
CROSS SECTIONS
ELECTRON COLLISIONS
ELECTRONS
EV RANGE
EXCITATION
GROUND STATES
HARTREE-FOCK METHOD
METASTABLE STATES
OSCILLATOR STRENGTHS
POLARIZABILITY
R MATRIX
RESONANCE
SCATTERING
WAVE FUNCTIONS