Resonant excitation and capture by excited F ii at low energies

Resonant capture cross sections for the first excited state of the F ii ion (1s22s2p5 3P) are calculated and the rate coefficients are evaluated at low energies involving excitation captures (n=l=0) to the singlet P state of the same configuration. The rates peak near the temperature kT=0.4 Ry, with the peak value of 2×10-12 cm3/sec. This is nearly 100 times larger than that for the ground states with intermultiplet excitations. The resonant contributions to the collisional excitation are also estimated. They are three orders of magnitude larger than the capture cross sections, mainly because of the smallness of the fluorescence yields of the resonance levels.