Relative probabilities of sixteen Ni I lines and fifty-three Ni ii lines in the wavelength range from 2000 to 3600 A have been measured with a wall-stabilized arc. The arc was operated at 10 amperes in argon with a small admixture (0.01 per cent) of nickel carbonyl. The spectrum was photoelectrically observed along the arc axis through the hollow electrodes. The relative intensity calibrations were performed by utilizing calibrated tungsten-strip lamps or the continuous emission of a hydrogen arc operated at known plasma conditions. The axis temperature of the argon nickel-carbonyl arc was determined from intensity measurements of argon lines of known transition probabilities and the application of the arc plasma equations. For most of the relative J-values the experimental and theoretical uncertainties are 8 per cent or better, but for a few weak lines the uncertainties go as high as 30 per cent. Comparisons with other experimental and theoretical results are undertaken and fair agreement is obtained.
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Bell et al. (1966) studied this question.