AES STUDY OF THE ADSORPTION OF O₂, CO, CO₂, AND H₂O ON INDIUM.

The adsorption of various oxygen-containing gases on clean polycrystalline In has been studied. For the In-O//2 system, the relationship between N (E) areas and dN (E)/dE peak heights for In MNN Auger transition was found to be linear. At saturation, an oxygen/indium ratio of 3/2 was measured, consistent with the formation of the stable oxide In//2O//3. Low-coverage sticking coefficients were found to be similar 0. 014 for O//2, similar 0. 004 for H//2O, similar 2 multiplied by 10** minus **5 for CO, and similar 5 multiplied by 10** minus **5 for CO//2. In each case, chemical shifts and peaks distortions in the N (E) and dN (E)/dE spectra have been measured for the gas-saturated In, the largest being similar 3 eV for the MNN transition of O//2-saturated surface.