Abstract
In this work we study in detail the Ne VII $2s3p\ensuremath{-}2s3s$ singlet line, which was also the object of a recent experiment. The standard perturbative impact theory predictions are tested against a fully nonperturbative semiclassical impact calculation, taking into account dipole and quadrupole interactions. Potentially very significant problems with the standard perturbative theory are encountered and discussed, and a simple remedy is proposed.
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