Dougherty Daniel B, Lee Junseok, Yates John T
J Phys Chem B. 2006 Oct 19;110(41):20077-80. doi: 10.1021/jp0645420.
Low-temperature STM observations of the low-coverage chemisorption behavior of iodobenzene on Cu(110) are presented at two annealing temperatures. When a random distribution of isolated iodobenzene molecules deposited at T < 100 K is annealed to approximately 170 K, the undissociated molecules assemble into chainlike clusters composed of identical subunits. An STM tip-induced dissociation reaction is used to determine that the individual units in the chains are composed of pairs of iodobenzene molecules. A model is proposed in which iodine atoms on each member of the pair are directed toward one another. The driving force for the formation of such clusters is suggested to be the dispersion interactions between the polarizable iodobenzene molecules.
本文展示了在两个退火温度下，对碘苯在Cu(110)上低覆盖度化学吸附行为的低温扫描隧道显微镜（STM）观测结果。当在T < 100 K时沉积的孤立碘苯分子的随机分布被退火至约170 K时，未解离的分子组装成由相同亚基组成的链状簇。利用STM针尖诱导的解离反应确定链中的单个单元由碘苯分子对组成。提出了一个模型，其中该对中每个分子上的碘原子相互指向。这种簇形成的驱动力被认为是可极化碘苯分子之间的色散相互作用。
