Stark-Shifts of the He II Spectral Lines

Shifts or He II spectral lines were measured, defining the c.g. or unperturbed fine-structure components having statistical intensity distribution as the origin of shift. The Stark-shift of He II λ4686A ( n =3← n '=4) is described in detail; the Stark-shift was found to depend on electron temperature, electron density and pressure of the plasma. Some discussion about the plasma-shift of the He II Lyα λ304A ( n =1← n '=2) is mentioned.