Excitation of C II lines by photoionization of neutral carbon

Details Excitation of C II lines by photoionization of neutral carbon Excitation of C II lines by photoionization of neutral carbon

Oct 1983

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983a%26a...126..415h&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 126, no. 2, Oct. 1983, p. 415-426.

Astronomy and Astrophysics

Astrophysics

10

Atmospheric Ionization, Carbon, Ionization Cross Sections, Photoionization, Solar Spectra, Sunlight, Atomic Excitations, Configuration Interaction, Ground State, Ionization Coefficients, Positive Ions, Resonance Lines, Ultraviolet Spectra

Scientific paper

To investigate discrepancies between the calculation of Hofmann et al. (1980) and that of Burke and Taylor (1979) using R-matrix method (Burke and Taylor, 1975), a new calculation is begun using a better description of the C(+) targets and seven C(+) states in the close coupling wave function. It is noted that Burke and Taylor found very strong resonances in the cross sections for photoionization from the 1s2 2s2 2p2 1D and 1S excited states of C I, denoted as 1s2 2s 2p3 resonances. To determine whether these resonances are physical or pseudo-resonances, the calculations of Hofmann et al. are extended to photoionization from the 1D and 1S states of C I. Bound and free wave functions and photoionization cross sections are calculated for neutral carbon in a close coupling approximation. Seven states of C(+) are included. Photoionization rates in sunlight at 1 AU for ionization from C I ground states (2s2 2p2 3P) and from the excited states 2s2 2p2 1D and 1S into the different C(+) states are calculated with two different spectra of the sun.

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