The hydroxylation of Cu(111) and Zn(0001) surfaces - Carley, A.F.; Davies, P.R.; Roberts, M.W.; Shukla, N.; Song, Y.; Thomas, K.K. (Elsevier)
XP and VEEL spectra are reported of high concentrations of OH(a) (σ= 4.7 x 10^1^4 molecules/cm^2) at Cu(111) and Zn(0001) surfaces. These high surface coverages were achieved by exposing the surfaces to oxygen-rich, water/oxygen mixtures at low temperatures. Significantly no evidence for chemisorbed oxygen (O^δ^-(a)) was observed in these experiments, indicating a very high reactivity of surface oxygen under coadsorption conditions. This contrasts with the limited reactivity of surface oxygen to water when the oxygen is preadsorbed. The present results are discussed in terms of an adsorbate islanding model proposed in studies of the analogous oxygen/ammonia system.
http://linkinghub.elsevier.com/retrieve/pii/0169-4332(94)00178-2
Keywords: U