Radiative lifetimes have been measured from beam-foil spectra of 24 lines of Ar II and 7 lines of Ar III in the wavelength range 2400–5000 Å. Agreement with the mean of other experimental results is to within 20%.
J. A. KERNAHAN, C. C. LIN, and E. H. PINNINGTON, "Radiative Lifetime Measurements of Some Ar II and Ar III Levels by the Beam-Foil Technique," J. Opt. Soc. Am. 60, 898-901 (1970)