Low pressure broadening and shift of the 3p54p-3p56s argon spectral lines perturbed by He, Ne and Ar

The collisional broadening and shift of two spectral lines 703.03 and 641.63 nm arising from the 3p54p-3p56s transitions of argon, emitted from a low-pressure glow discharge in pure argon, argon-neon and argon-helium mixtures have been measured. The values of the pressure broadening and shift coefficients are determined. For both lines in the pure argon a red shift and in the argon-helium mixture a blue shift has been found. In the argon-neon mixture a blue shift for the 641.63 nm line has been found. 25 refs., 3 figs., 4 tabs. (author)