The stereodynamics of a gas-surface reaction
The stereodynamics of a gas-surface reaction
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DOI：
10.1126/science.277.5322.80
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发表时间：
1997-07-04
期刊：
影响因子：
56.9
通讯作者：
Auerbach, DJ
中科院分区：
文献类型：
--
作者：
Hou, H;Gulding, SJ;Auerbach, DJ
反应物排列对化学反应速率影响的测量提供了有关化学转化所需的原子运动的直接信息。这里提供的数据表明，在低碰撞能量下，铜 (111) 表面上氘 (D-2) 的解离吸附发生侧面碰撞的概率比端部碰撞的概率高得多。此外，这种空间偏好对入射分子的动能很敏感，当能量增加到 0.8 电子伏时几乎消失。这项研究表明，表面化学反应的动态条件可以深刻影响相关的空间要求。
Measurements of the influence of reactant alignment on the rates of chemical reactions provide direct information concerning the atomic motions necessary for chemical transformation. Data presented here show that at low collision energy, the dissociative adsorption of deuterium (D-2) on the (111) surface of copper has a much higher probability for broadside than for end-on collisions. Furthermore, this steric preference is sensitive to the kinetic energy of the incident molecule, almost disappearing as the energy increases to 0.8 electron volt. This study shows that the dynamic conditions of a surface chemical reaction can profoundly influence the associated steric requirements.