The dynamics of gas-surface energy exchange in collisions of Ar atoms with ω-functionalized self-assembled monolayers
The dynamics of gas-surface energy exchange in collisions of Ar atoms with ω-functionalized self-assembled monolayers
复制标题
Ar 原子与 ω 功能化自组装单分子层碰撞时气体表面能量交换的动力学
DOI：
10.1063/1.1609971
复制
发表时间：
2003
影响因子：
4.4
通讯作者：
J. R. Morris
中科院分区：
文献类型：
--
作者：
B. S. Day;S. F. Shuler;Adonis Ducre;J. R. Morris
利用原子束散射实验研究了正烷基硫醇和ω功能化烷基硫醇自组装单分子膜(SAM)在金表面与模型有机表面碰撞过程中气体-表面能量交换的动力学。研究是通过将一束接近单能的80kJ/molAr原子束以与表面法线成30°的角度入射到特定的SAM上，并记录原子以30°的最终角度从表面散射时的飞行时间分布。在所研究的单分子膜中，以CH3为端基的长链自组装膜在消散入射原子的平动能方面最为有效。对于总碳原子数大于7的烷硫醇(HS(CH2)n>；6CH3)，我们发现，在镜面散射条件下，超过80%的入射能量转移到表面，超过60%的入射原子在散射回到气相之前与表面达到热平衡。相比之下..。
Atomic-beam scattering experiments using n-alkanethiol and ω-functionalized alkanethiol self-assembled monolayers (SAMs) on gold are employed to explore the dynamics of gas-surface energy exchange in collisions with model organic surfaces. The studies are performed by directing a nearly monoenergetic beam of 80 kJ/mol Ar atoms onto a particular SAM at an incident angle of 30° with respect to the surface normal and recording the time-of-flight distributions for the atoms as they scatter from the surface at a final angle of 30°. Among the monolayers studied, long-chain CH3-terminated SAMs are found to be the most effective at dissipating the translational energy of impinging atoms. For alkanethiols with greater than seven total carbon atoms (HS(CH2)n>6CH3), we find that, for specular scattering conditions, over 80% of the incident energy is transferred to the surface and that over 60% of the impinging atoms approach thermal equilibrium with the surface before scattering back into the gas phase. In contrast ...