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Recombination coefficients for C II lines TeX Export

Astron. Astrophys. Suppl. Ser., Vol. 142, pp. 85-94.

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recombination

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Effective recombination coefficients are given for C II transitions between doublet states. The calculations are carried out in the temperature range $500 - 20\,000\;K$ and for an electron density of 10^4 cm^-3. The effects of electron collisions on the excited states are included. The necessary bound-bound and bound-free radiative data are obtained from a new R-matrix calculation in which photoionization resonances are fully delineated, thereby accurately incorporating the effects of both radiative and dielectronic recombination. The R-matrix calculation includes all bound states with principal quantum number $n ≤ 15$ and total orbital angular momentum $L ≤ 4$. The effect of moving the resonance features to their experimentally determined positions is also investigated and found to be important at low temperatures.


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