C II emission lines formed in optically thin plasmas

Details C II emission lines formed in optically thin plasmas C II emission lines formed in optically thin plasmas

Jul 1985

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985apj...294..200l&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 294, July 1, 1985, p. 200-206. SERC-supported research.

Physics

96

Cosmic Plasma, Planetary Nebulae, Stellar Physics, Transition Probabilities, Ultraviolet Spectra, Computer Programs, Electron Energy, Electron Impact, Electron Scattering, Optical Thickness

Scientific paper

New Einstein A-coefficients and electron impact collision rates are presented for transitions between the three lowest LS states of C II. The former are based on complex configuration interaction wave functions, while the latter use such wave functions in an eight-state R-matrix calculation of the collision process. These new atomic data are then used to calculate populations for the corresponding seven fine-structure levels on the assumption of an isotropic optically thin plasma. Theoretical emission-line intensity ratios deduced from these populations are in excellent agreement with observed low- and high-density limits.

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