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We present in this paper electron impact broadening for six Ar XV lines usingour quantum mechanical formalism and the semiclassical perturbation one.Additionally, our calculations of the corresponding atomic structure data(energy levels and oscillator strengths) and collision strengths are given aswell. The lines considered here are divided into two sets: a first set of fourlines involving the ground level: 1s$^{2}2$s$^{2}$ $^{1}$S$_{0}-$1s$^{2}2$s$n$p$^{1}$P$^{\rm o}_{1}$ where $2\leq n \leq5$ and a second set of two linesinvolving excited levels: 1s$^{2}2$s2p $^{1}$P$^{\rm o}_{1}-$1s$^{2}2$s3s$^{1}$S$_{0}$ and 1s$^{2}2$s2p $^{3}$P$^{\rm o}_{0}-$1s$^{2}2$s3s$^{3}$S$_{1}$. An extensive comparison between the quantum and thesemiclassical results was performed in order to analyze the reason fordifferences between quantum and semiclassical results up to the factor of two.It has been shown that the difference between the two results may be due to theevaluation of strong collision contributions by the semiclassical formalism.Except few semiclassical results, the present results are the first to bepublished. After the recent discovery of the far UV lines of Ar VII in thespectra of very hot central stars of planetary nebulae and white dwarfs, thepresent -and may be further- results can be used also for the correspondingfuture spectral analysis.

Quantum Stark broadening of Ar XV lines. Strong collision and quadrupolar potential contributions