We report results of a study on steric effects appearing in the scattering of an oriented CH(3)Cl molecular beam from Si(111) at surface temperatures > or = 300 K. Data presented here show that the scattered CH(3)Cl beam intensity measured at fixed scattering angles clearly depends on the initial molecular (CH(3)Cl) orientation toward the Si surface. The scattered CH(3)Cl beam intensity for the CH(3)-end collision is larger than that for the Cl-end collision, suggesting that strong anisotropy of the interaction potential induces the molecular-orientation-dependent energy dissipation during transient trapping into a shallow potential well.
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| http://dx.doi.org/10.1021/jp907225b | DOI Listing |
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