We report results of a study Oil steric effects appearing in the scattering of an oriented CH3Cl molecular beam from Si(111) at surface temperatures >= 300 K Data presented here show that the scattered CH3Cl beam intensity measured at fixed scattering angles clearly depends oil the initial molecular (CH3Cl) orientation toward the Si surface The scattered CH3Cl beam intensity For the CH3-end colliston 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 it shallow potential well