Abstract
Rubidium and cesium form stable metal-rich oxides (suboxides) which have been investigated by thermal and structural analysis. The compounds Rb 9O 2, Rb 6O (≜ Rb 9O 2Rb 3), Cs 11O 3, Cs 4O (≜ Cs 11O 3Cs 10), Cs 11O 3Rb, and Cs 11O 3Rb 7 contain the characteristic ionic clusters Rb 9O 2 and Cs 11O 3. A simple model for the chemical bonding in alkali metal suboxides is described and proved by measuring the electrical properties and optical reflectivities as well as photoelectron spectra of these compounds. It is found that cesium suboxides play an important role in widely used photocathodes and image converters of type S1. The IR sensitivity of these devices is explained on the basis of surface plasmon-enhanced photoemission.
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