Abstract

Oxygen has been shown by X-ray photoelectron spectroscopy (X.p.s.) and ultraviolet photoelectron spectroscopy (u.p.s.) studies to be adsorbed both molecularly and dissociatively at an Ag(110) surface at 80 K. Chemisorbed chlorine inhibits the formation of the dissociative state. The interaction of water vapour with Ag(110) is influenced strongly, even at 80 K, by the presence of O2–(a). The formation of surface hydroxyls and hydrogen-bonded water clusters is discussed. Surface oxygen undergoes a chemisorptive replacement reaction with HCl(g) below 175 K.

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