On the absorption and series spectra of nickel

The Paper gives an account of the experiments on the absorption spectrum of nickel by the under-water spark from λ6000-λ2000. In the region λ3800 to λ2100, 180 wavelengths were obtained in absorption. The majority of these lines were classified by Bechert and Sommer. Intensity values of the absorbed lines showed that the intensity rule and the selection rule for inner quantum numbers were accurately fulfilled. The results confirm in a striking manner the recent classifications of Bechert and Sommer in the arc spectrum of nickel.