Abstract: We investigate the influence of ion collisional excitation on gain estimates for lasing between the two 3d - 2p fine-structure transitions in a recombining, hydrogen-like magnesium plasma. A sizable reduction of the 3d$-3/2$/ - 2p$-1/2$/ gain coefficient is found, resulting from both collisional population transfer and from lower state broadening of the emission profile. The need for care in evaluating the latter effect is discussed.!3
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