Abstract
The stereochemical control of surface reactions is one of the ultimate goals of surface scientists. An oriented-molecular-beam technique based on the Stark effect of a molecule in an inhomogeneous hexapole electrostatic field is a potential tool for achieving this goal. This technique allows us to select a specific rotational quantum state and also an orientation of a reagent molecule. We have designed, built, and tuned a new UHV-compatible oriented-molecular-beam machine for the elucidation of surface chemical reactions and their related surface modifications. This apparatus is equipped with the components for X-ray photoemission spectroscopy (XPS) in order to detect the surface-reaction products. In the dissociative adsorption of NO on a Si{111} surface, we found a steric effect in the reactivity by monitoring the products on the surface with the new machine. The N-end collision is more reactive than the O-end collision at an incident energy of 58 meV. To our knowledge, this is the first measurement of the steric effect appearing in the reaction products on a surface.
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