并五苯分子在Ag(110)表面成膜过程中的结构研究

采用低能电子衍射原位研究了并五苯分子（C₂₂H₁₄）在Ag(110)单晶表面的生长，观察了在初期沉积过程及随后基底变温过程中分子层结构的形成和变化.室温下并五苯分子在Ag(110)基底表面具有高的迁移性，从开始无序的亚单层膜结构逐渐形成有序的单层膜结构．实验和理论分析表明：并五苯分子平铺在Ag(110)表面，形成了与基底构成有关的有序结构，存在沿基底晶向成镜面对称的两种畴界取向，在基底温度从室温升高到接近并五苯升华温度的过程中，基底上的有序分子层结构保持稳定不变 关键词： 并五苯 低能电子衍射图案 分子层结构 Ag(110)

In situ investigation of structural properties during formation of pentacene thin film on Ag (110) with MBE-LEED

The structural transition of pentacene thin films on single Ag (110) crystals has been directly observed using a home-designed in situ low-energy electron diffraction during the course of absorption and subsequently changes of substrate temperature.The pentacene moleculs showed the evolution from disordered structure in the submonolayer region to a well-ordered structure in the monolayer on the substrate at room temperature.The experimental and theoretical results showed that the molecules lay flat on the Ag (110) surface with two domain orientations mirrored with respect to the crystal axis of the silver substrate.Furthermore, the ordered structures can keep stable when the substrate temperature is below the sublimation temperature of pentacene.