Experiments and simulations of hyperthermal Xe interacting with an ordered 1-decanethiol/Au(111) monolayer: Penetration followed by high-energy, directed ejection
Experiments and simulations of hyperthermal Xe interacting with an ordered 1-decanethiol/Au(111) monolayer: Penetration followed by high-energy, directed ejection
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DOI：
10.1021/jp055171a
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发表时间：
2006-02-02
影响因子：
2.9
通讯作者：
Sibener, SJ
中科院分区：
文献类型：
--
作者：
Gibson, KD;Isa, N;Sibener, SJ
本文研究了正癸醇在Au（111）表面上吸附的有序立相与超高温吸附剂的相互作用。在实验上，双微分测量的碰撞后的动能作为入射角和最终角度的函数。这些实验相比，经典的轨迹计算。结果表明，两个预期的渠道：直接非弹性散射的表面和容纳的陷阱解吸。还有证据表明存在进一步的相互作用机制。这涉及原子深入到单层的对齐链之间的通道中的渗透。当碰撞能量被耗散时，注入的电子被驱逐，因为链返回到它们的平衡位置。被驱逐的dexamethane离开表面的能量远高于预期的捕获-解吸，并与角强度分布接近的1-decanethethane链取向的方向达到峰值。由于这个原因，我们称这种新的散射机制为定向喷射。
A study of the interaction of hyperthermal Xe with a well-ordered standing-up phase of 1-decanethiol adsorbed on Au(111) is presented. Experimentally, double-differential measurements were made of the postcollision Xe kinetic energy as a function of incident and final angles. These experiments are compared to classical trajectory calculations. The results show the two expected channels: direct-inelastic scattering from the surface and accommodated Xe due to trapping-desorption. There is also evidence of a further interaction mechanism. This involves the penetration of the atom deep into the channels between the aligned chains of the monolayer. When the collision energy has been dissipated, the implanted Xe is expelled as the chains return to their equilibrium positions. The expelled Xe leaves the surface with an energy much higher than expected for trapping-desorption, and with an angular-intensity distribution peaked close to the direction of the 1-decanethiol chain orientation. For this reason, we call this new scattering mechanism directed ejection.