Transition rates in singly ionized titanium

Rates have been calculated for electric dipole transitions in Ti II between the tine structure levels of the terms 4pz 4G(omicron), 4 F(omicron), 2 F(omicron) 2 D(omicron),4 D(omicron) and 2G(omicron) to the levels of the ground term 4s a^-4 F and comparisons are made with the most recent available observations as well as with the calculations of Kurucz. These are the only other calculations available for this ion. To include certain configurations with more than two open shells, new approximations are necessitated by the complexity of the algebra. The approximations used are described and the results of calculations are given to demonstrate their effectiveness and accuracy. It will be shown that the CPU time reductions arc very substantial, sufficient to make the inclusion of potentially important configurations feasible where it would not be so otherwise. The loss in accuracy in the situations examined is negligible. New results for transition rates that have not been measured are presented.