We report the first direct observation of dissociative chemisorption of O-2
molecules on a Si surface. We link this to our other new observation that
smooth oxide layers can be grown easily on Si(113). The initial oxidation i
s discussed in terms of surface diffusion paths and surface stress. Ab init
io calculations help elucidate the favored adsorption sites and the oxidati
on mechanism. (C) 2000 Elsevier Science Ltd. All rights reserved.