Transition probabilities of some ArI and ArII spectral lines

Abstract

The transition probabilities of four lines of singly ionized argon have been determined from radiance measurements of spectral lines emitted by an argon-arc discharge in a sealed tube. The wavelengths of the lines are λ = 4348, 4806, 4847, and 4879 Å. Self-absorption was taken into account. Within the experimental errors, our results agree with the values calculated theoretically by Statz et al. The transition probabilities of four spectral lines of neutral argon have been found to be in agreement with literature values. The lines in question are located at 3834, 4251, 4259, and at 6965 Å. The temperature on the axis of the discharge was obtained from the spectral density of the radiance in the continuous spectrum emitted by the discharge and, in one experiment, also from the radiances of three spectral lines of neutral argon. In the latter case, use was made of the transition probability of the line λ = 4300 Å and of the ratio of the transition probabilities of the lines λ = 3834 and 6965 Å. These data were taken from the literature; the results agree with those obtained from the continuous spectrum.