Effective collision strengths for OIII transitions

The collision strengths have been calculated in the close-coupling approximation using the B-spline Breit-Pauli R-matrix method. The multiconfiguration Hartree-Fock method in combination with B-spline expansions is employed for an accurate representation of the target wave functions.

The close-coupling expansion contains 202 O^2+^ fine-structure levels of the 2s^2^2p^2^, 2s2p^3^, 2p^4^, 2s^2^2p3s, 3p, 3d, 4s, 4p, 4d, 4f, 5s, and 2s2p^3^3s, 3p, 3d configurations. The effective collision strengths are obtained by averaging electron excitation collision strengths over a Maxwellian distribution of velocities at electron temperatures ranging from 100 to 100000K. The calculated effective collision strengths have been reported for the 20302 transitions between all 202 fine-structure levels.