Stark parameters of neutral helium 318.8 nm line

Aims.Our aims is to measure with good accuracy the Stark parameters (width and shift) of the He I 318.8 nm (2s $\mathrm{^3}$S-4p $\mathrm{^3}$P$\mathrm{^o}$) line and to calibrate Stark width and shift dependencies of this line as a function of the electron density. In this way, it is possible to obtain an alternative method of diagnosing the plasmas of astrophysical origin and to check the quality of theoretical models that predict these parameters.