Clustering of chemisorbed H(D) atoms on the graphite (0001) surface due to preferential sticking
Clustering of chemisorbed H(D) atoms on the graphite (0001) surface due to preferential sticking
复制标题
DOI：
10.1103/physrevlett.97.186102
复制
发表时间：
2006-11-03
影响因子：
8.6
通讯作者：
Besenbacher, F.
中科院分区：
文献类型：
--
作者：
Hornekær, L.;Rauls, E.;Besenbacher, F.
我们提出了扫描隧道显微镜实验和密度泛函理论计算，揭示了在石墨表面形成氢吸附簇的独特机制。我们的结果表明，氢原子的扩散在很大程度上是不活跃的，并且聚集是优先粘附到特定吸附物结构的结果。这些令人惊讶的发现是由于表面已吸附的氢原子附近氢的吸附势垒减少甚至消失所致，并指出了星际 H-2 形成的可能新途径。
We present scanning tunneling microscopy experiments and density functional theory calculations which reveal a unique mechanism for the formation of hydrogen adsorbate clusters on graphite surfaces. Our results show that diffusion of hydrogen atoms is largely inactive and that clustering is a consequence of preferential sticking into specific adsorbate structures. These surprising findings are caused by reduced or even vanishing adsorption barriers for hydrogen in the vicinity of already adsorbed H atoms on the surface and point to a possible novel route to interstellar H-2 formation.