Photoionization of highly charged carbonlike ions

Physics

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Autoionization, Charged Particles, Ground State, Photoionization, Plasma Resonance, Aluminum, Configuration Interaction, Fluorine, Ionization Cross Sections, Local Thermodynamic Equilibrium, Magnesium, Neon, Sodium

Scientific paper

Close-coupling calculations using the R-matrix method are carried out for the photoionization cross sections of the carbonlike ions F(3+), Ne(4+), Na(5+), Mg(6+), Al(7+), Si(8+), S(10+), Ar(12+), Ca(14+), and Fe(20+), which are of interest in the calculation of plasma opacities. Detailed results including extensive structures due to autoionizing resonances are presented for the ground states; however, the calculations are also carried out for a large number of excited bound states of each ion, and their features are discussed. The partial photoionization cross sections of the ground state into excited states of the residual ion are obtained. The effect of resonances on the branching ratios of partial cross sections at excited thresholds is discussed. Interesting features related to the Z dependence of the ground-state photoionization cross sections of all ions in the C sequence are discussed.

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