Measurements of photo-electron spectra and charging effects in fluorides,iodates and oxides

The ionization energies of inner electron shells have been measured without (I) and including (I′) a correction for the charging effect of non-conducting solid samples (derived from the two different Scotch tape C1s signals observed) for the fluorides, iodates and oxides of 25 elements with a definite oxidation state z. Whereas the difference between the I′ values for the fluoride and the oxide is close to z eV in most cases, this difference almost vanishes in Hg^II and is small in several other post-transition group elements.