Excitation and ionization of highly charged ions by electron impact. Progress report, May 1, 1983-April 30, 1985

The reduced cross sections for ionization from the 5s, 5p, 5d, 5f, 5g, 5s, 6p, 6d, 6f, 6g and 6h sublevels in hydrogenic ions have been calculated for impact electron energies ranging from near threshold energy to 6 times threshold energy. With these results together with our previous results for lower sublevels values can be readily obtained for the direct ionization cross section for ionization from any subshell nl with n less than or equal to 6 in complex ions using a simple procedure given in our earlier work. Collection strengths and line strengths have been calculated for innershell excitation of Li-like ions from the 1s22s and 1s22p levels to all levels of the 1s2l2l' and 1s2l3l' configurations and from the 1s23l levels to the levels of the 1s2l'3l'' configurations. Also the collision strengths and line strengths have been calculated for all 120 possible fine structure transitions between the levels of the 1s2l2l' configurations in Li-like ions and for all 105 possible fine structure transitions between the levels of the 1s22s22p, 1s22s2p2 and 1s22p3 configurations in boron-like ions. In each of these cases results were obtained for a wide range of impact electron energies. The calculations were made for 19 values of the nuclear charge number Z in the range 6 less than or equal to Z less than or equal to 74 for Li-like ions and for 17 values of Z in the range 10 less than or equal to Z less than or equal to 74 for boron-like ions. In all cases the collision strengths have been fitted to simple functions of the impact electron energy that are readily integrated over a Maxwellian to obtain collision rates. The results include the effects of configuration mixing, parentage mixing and intermediate coupling type mixing. A brief discussion is given of plans for future work. 49 refs