Abstract
Puzzling discrepancies between quantum mechanical (QM) electron impact calculations of isolated ion lines and nonperturbative semiclassical (SC) calculations are reviewed. The origin of these discrepancies was the use of a standard linebroadening literature estimate of the wavefunction extent. The nonperturbative semiclassical calculations are further improved by dropping the long-range approximation and allowing penetrating collisions. This results in excellent agreement with fully quantal calculations for the case of the BIII 2s-2p line. On the other hand the standard perturbative semiclassical method is inadequate even in this particular example, where perturbation theory is valid. Further, the assumption of neglecting the back-reaction in semiclassical calculations is examined.
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