Electron Collisional Excitation Rates for O i Using the B ‐Spline R ‐Matrix Approach

The B -spline R -matrix approach has been used to calculate electron collisional excitation strengths and rates for transitions between the 3 P , 1 D , and 1 S states of ground configuration and from these states to the states of the excited 2 s 2 2 p 3 ns ( n = 3-5), 2 s 2 2 p 3 np ( n = 3-4), 2 s 2 2 p 3 nd ( n = 3-4), 2 s 2 2 p 3 4 f , and 2 s 2 p 5 configurations. The nonorthogonal orbitals are used for an accurate description of both the target wave functions and the R -matrix basis functions. The thermally averaged collision strengths are obtained from the collision strengths by integrating over a Maxwellian velocity distribution of electron energies, and these are tabulated over a temperature range from 1000 to 60,000 K. The parametric functions of scaled energy have also been obtained to represent collision strengths over a wide energy range or thermally averaged collision strengths at any desired temperature.