Atomic data from the IRON project. XLVI. Electron excitation of 3s3p6 and 3s23p43d fine-structure transitions in Fe x

Electron excitation collision strengths for fine-structure transitions 3s²3p⁵-3s3p⁶, 3s²3p⁵-3s²3p⁴3d and 3s3p⁶-3s²3p⁴3d in Fe x, are calculated using a 180-level Breit-Pauli R-matrix calculation containing the above levels together with those from 3s3p⁵3d and 3s²3p³3d² configurations. The collision strength is averaged over a Maxwellian velocity distribution to obtain the effective fine-structure collision strengths as a function of electron temperature from log T(K)=5.4-7.0. We show that low-energy resonances enhance the effective collision strength, with significant effects on level populations.