XIX. The L spectra of nickel and copper

Summary An experimental investigation has been made of the L spectra of nickel and copper, with a view to obtaining information about the distribution of the 3d, 4s and 4p states in these metals, and also the processes of x-ray emission and absorption. As already known, the L emission bands of nickel and copper show striking differences. The copper band observed is somewhat different from the one reported by Farineau; it is in good agreement with that to be expected from Mott's views on the behaviour of the electrons in this metal. The L absorption spectra of copper and nickel were obtained for the first time; they help in interpreting the emission spectra. Some discussions are given of the present results in connection with former experimental and theoretical results from other authors. It is shown that the L spectra here obtained are consistent with the colour of nickel and copper. Mention is made of a similar agreement in the case of silver.