Infrared spectra of CO adsorbed on Si, Ge and ZnS evaporated films

Abstract

Infrared spectra of CO adsorbed on high-surface-area Si, Ge and ZnS evaporated films were investigated in the temperature range 77–100 K.

Two absorption bands were obtained in the 2200–2000 cm^–1 region. For Si and Ge substrates the bands showed similar behaviour towards desorption and surface oxidation whereas for ZnS the introduction of O₂ to the cell had no apparent influence. The results are explained in terms of CO physisorbed on two different sites present on the substrates' surfaces.