Infrared Spectra and Surface Reactions of HCl, DCl and Cl2 Adsorbed on Germanium

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Abstract
Adsorption of HCl, DCl and Cl2 on high surface area germanium films was studied by means of IR absorption spectra. The films were prepared by high temperature evaporation of germanium in a helium atmosphere. On adsorption of HCl and DCl two main absorptions appeared at 460 cm−1 and 408 cm−1 and additional weaker bands at 2050 cm−1 and 2920 cm−1 (with HCl) and at 1313 cm−1 (with DCl). The spectra indicate that both gases undergo dissociation on adsorption. In the case of Cl2 the bands at 460 cm−1 and 408 cm−1 appeared in the spectrum; here again strong evidence exists that dissociative adsorption takes place. Mass spectrometer analysis showed that the desorption product consists mainly of GeCl4.