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Magnesium Kα3,4 satellite spectra along with the Kα1,2 diagram line and the Kα' satellite line from magnesium, its oxide, halides, sulphate, acetate and binary alloys with silver, cadmium, indium, tin and antimony have been recorded in direct excitation using a Johann-type crystal spectrometer with a MoS2 crystal (2d = 12.30 Å). It is found that the chemical environment surrounding the emitting atoms affects the satellite intensity ratio (IKα4/IKα3) strongly. No obvious trend between the electronegativity differences of the compounds and the intensity ratios of the Kα4/Kα3 satellites is evident. No linear relationship between the satellite intensity ratios (IKα4/IKα3) and the magnesium content in the alloy is observed as reported by Baun and Fischer for the aluminium system. The origin of the Kα3 and Kα4 satellites is discussed.

The energy values of the individual members of those spin doublets of levels for certain atomic number ranges, for which only the experimentally obtained weighted averages of these energies were tabulated by Bearden and Burr (1967), have been calculated by using the screening parameters sigma 1 and sigma 2 previously reported by the authors. The energy values so obtained are further refined by the method of the modified Moseley plot. These refined energy values of the individual members of the spin doublets agree very well with the experimental electron spectroscopic energy values of Fuggle and Martensson (1980) and those of Cardona and Ley (1978) as corrected by Williams. The screening parameters sigma 1 and sigma 2 for a number of doublets of levels are reported for the first time.

It is well known that the Sommerfeld screening parameters U , and u2 for a spin doublet of levels can only be calculated if the individual energies of the two members of the doublet are known. In several cases, the resolution of the experimental method for finding the energies has proved insufficient and so only the energy of the unresolved doublet of levels has been reported. A new method has been developed for calculating these parameters for a spin doublet of levels by using the unresolved experimental energy values given by Bearden and Burr. The results of our calculations are presented. It is found that the energy values calculated by using these parameters in the Sommerfeld energy expression are in very good agreement with the recently reported resolved experimental energy values of the individual components of different spin doublets.