The energies of the 3p1/2,3/2, 3d3/5,5/2, 4s, and 4d3/2,5/2 photopeaks have been measured for tellurium metal and 23 of its compounds. An attempt is made to interpret chemical bonding in some of the tellurium compounds by comparing core level binding energy shifts with isomer shifts observed through Mossbauer spectroscopy. The widths of the 3p3/2 photopeaks measured relative to the 3p1/2 photopeaks are examined for broadening by electric field gradients and Coster–Kronig transitions. Variations in the spin–orbit splitting of the tellurium 4d level in its various compounds do not seem to be dependent on crystal field interactions.

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The energies of the 2p1/2, 2p3/2, 3s, 3p1/2, 3p3/2, and 3d3/2,5/2 photopeaks and of the L2,3M4,5M4,5 Auger peaks have been measured for arsenic metal and 19 of its compounds. By comparing the photopeak and Auger chemical shifts, the changes in the total (static) relaxation energies were determined. It was found that the relaxation energy change provides a useful parameter for characterizing nearest neighbor groups and that electronegativities derived from them offer the advantages that they are independent of the energy reference level and of charging effects.

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