Valence-Band X-Ray Photoemission of PbI₂ and CdI₂

Abstract

The valence-band spectrum in X-ray photoemission of PbI 2 does not agree with the reported results of energy-bend calculations, which predict that the highest valence band consists mainly of the 6 s state of Pb ++ and is isolated from other component-bands. Weak lines are found about 6 eV below the valence-band lines in various Pb-compounds. It is suggested that either the weak line in PbI 2 corresponds to the 6 s level of Pb ++ or the upper part of the valence band has both the 6 s character of Pb ++ and the 5 p character of I - appreciably. The valence-band spectrum of CdI 2 resembles the valence-band spectrum of PbI 2 . The data of the chlorides and bromides of Pb and Cd are also presented.