R.A. Pollak

Characteristic energy loss structure of solids from x-ray photoemission spectra

Abstract Energy loss peaks in x-ray photoemission spectra of nine metals are presented. No strong evidence for intrinsic plasmon structure was observed. Spectra from the free electron-like metals, Al, Li, and Na under ultra-high vacuum (10 −11 torr) conditions show intense bulk plasmons and surface plasmons. Systematic variations in the characteristic energy losses are reported for the series Ag to Te. In addition to losses that may be attributed to plasma oscillations of the 5s5p bands, with N = 1 and 2 electrons, respectively, both Ag and Cd show additional high-energy losses that may arise through 4d-shell participation, with N = 11 and 12.

The onset of relativistic effects in the density of states of the 6s6p elements Tl, Pb, and Bi

Abstract Spin-orbit splitting of the 6p band is manifest in the XPS spectra of Pb and Bi. Lowered energies of the 6s band indicate the presence of the mass-velocoty and Darwin terms.

High-resolution XPS spectra of Ir, Pt and Au valence bands

Abstract Structural features in the valence band XPS spectra vary from Ir ( Z = 77) to Au ( Z = 79)as expected on the basis of 5d6s band filing.

The structural nature of amorphous Se and Te

Abstract We present new photoemission measurements on amorphous and trigonal Te. These results and other recent photoemission experiments on amorphous and trigonal Se are interpreted using density of states and charge density calculations. These studies result in new insights into the possible structural nature of the amorphous phase.