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We present in this work energy levels, oscillator strengths, radiative decayrates and fine structure collision strengths for the Mg III and Al IV ions. The11 configurations:(1s$^{2}$) 2s$^{2}$2p$^{6}$, 2s$^{2}$2p$^{5}3l$,2s2p$^{6}3l$, 2s$^{2}$2p$^{5}4l$ ($l\leq n-1$, where $n$ is the principalquantum number), yielding the lowest 75 levels are used. The collisional datafor these two ions are missing in the literature, especially the databaseCHIANTI, this is the principal motivation behind the present work. Calculationshave been performed using the AUTOSTRUCTURE code. AUTOSTRUCTURE treats thescattering problem in the distorted wave approach. Fine structure collisionstrengths are calculated for a range of electron energies from 10 Ry to 240 Ry.The atomic structure data are compared to available experimental andtheoretical results.

Structural and collisional data for Mg III and Al IV