研究期間：10208~10307;We propose to construct a molecular beam source coupled with an ultrahigh-vacuum system for surface analysis, in order to conduct molecular beam scattering experiments. Surface science has to a large extent been driven by the knowledge of catalysis at atomic level, whereas there are two major gaps between applied heterogeneous catalysis and fundamental surface science research: the materials gap and the pressure gap. The pressure gap originates from the need of most surface sensitive techniques of a high vacuum environment, in contrast to real catalysed reactions that are carried out at atmospheric pressure or higher. The molecular beam methods can reduce the pressure gap and extend our study to understanding of reaction kinetics at the microscopic level. We plan to apply the molecular beam methods to metal nanoclusters on the well-defined oxides. The combined approach provides unique advantages: first, such model systems possess structural or chemical complexity of catalyst surfaces, which allows one to tune their properties to maximize the selectivity and activity with respect to the desired reaction; second, molecular beam methods can provide the correlation of structural information to quantitative and detailed kinetic data.