Orientation in molecule surface dynamics

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Abstract
Using an electrostatic hexapole focusing technique a state selected NO [2Π1/2(J=1/2, Ω=1/2, MJ=1/2)] beam is produced. This selected state has a preferential orientation of the internuclear axis with respect to an electrostatic field. By scattering this beam from a crystal placed in a homogeneous electrostatic field steric effects in gas–surface scattering can be investigated. Steric effects are measured for the direct scattering and adsorption of NO on Ag(111) and Pt(111). For direct scattering larger reflection angles are measured in case of an O‐end collision, than in case of an N‐end collision. In the experiments on adsorption/desorption it appears, that on Ag(111) adsorption is enhanced for the O‐end towards the surface, whereas on Pt(111) adsorption is enhanced for the N‐end towards the surface. The steric effects observed for NO/Ag(111) scattering, might be interpreted in terms of larger rotational excitation of the molecule with the O‐end down than in case of the N‐end down. Since the rotational e...

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