Photoelektronenspektroskopie an den Alkalimetallen Rb und Cs und deren metallreichen Oxiden / Photoelectron Spectroscopy of the Alkali Metals Rb and Cs and their Metal Rich Oxides

Abstract

The alkali metals Rb and Cs and their suboxides Cs₁₁O₃, Cs₇O (≙ [Cs₁₁O₃]Cs₁₀) and [Cs₁₁O₃]Rb₇ have been investigated by UPS (HeI). Extremely narrow O2p levels are observed, as well as significant differences in the binding energies of the 5p levels of chemically different Cs-atoms. From energy loss structures (surface plasmons) electron concentrations are determined. The results are discussed in terms of structurally derived bonding models. The alkali metal suboxides are of importance in IR-sensitive Ag/Cs/O-photocathodes.