Department of Chemistry, Graduate School of Science, Osaka University, 1-1 Machikaneyama-cho, Toyonaka, Osaka 560-0043, Japan.
J Phys Chem A. 2010 Mar 11;114(9):3080-6. doi: 10.1021/jp907225b.
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.
我们报告了在表面温度大于等于 300 K 时，从 Si(111)上散射取向的 CH(3)Cl 分子束中出现的位阻效应的研究结果。这里呈现的数据表明，在固定散射角测量的散射 CH(3)Cl 束强度明显取决于初始分子（CH(3)Cl）相对于 Si 表面的取向。对于 CH(3)-端碰撞，散射的 CH(3)Cl 束强度大于 Cl-端碰撞，表明相互作用势能的强烈各向异性导致在短暂捕获到浅势能阱期间分子取向依赖性的能量耗散。
