Resonant excitation of F II at low energies

Resonant excitation cross sections for singly charged F ions at low energies are presented in which the projectile electron is first resonantly captured as the target electrons are excited and the intermediate states thus formed subsequently decay by Auger electron emission. For the initial ground state configuration there are nine different modes of intrashell excitations corresponding to the transitions (∆n = 0 ∆l = 0) and (∆n = 0 ∆l = 1) for incident energies below 2.17 Ryd. The cross sections are very large as much as a factor of 10³larger than that of dielectronic recombination. Typically they are of the order of 10^–16cm²for the energy-averaged cross sections over the bin size of 0.01 Ryd.