OIV Effective collision strength

Electron collision excitation strengths and rates for infrared and ultraviolet lines arising from transitions between the fine-structure levels of the 2s^2^2p, 2s2p^2^, 2p^3^, 2s^2^3s, 2s^2^3p, 2s^2^3d, 2s2p3s, 2s2p3p, 2s2p3d, 2s^2^4s, and 2s^2^4p configurations of OIV have been calculated using Breit-Pauli R-matrix approach. Configuration-interaction wave functions have been used for an accurate representation of target levels.

These wave functions give excitation energies that are in close agreement with experiment. Oscillator strengths and transition probabilities for UV and EUV lines compare very well with previous calculations. The Rydberg series of resonances converging to the excited levels are explicitly included in the scattering calculation and are found to make substantial contribution to collision strengths.