Development of a Novel Multi-Functionalized System for Surface Reaction Analysis in Photo excited Epitaxy

研究人员开发了一种飞行时间傅立叶变换离子能量分析仪，用于电子或光刺激解吸产物的空间分辨和能量分辨观察。本课题将反射吸收红外光谱仪（RAIRS）与分析仪相结合，建立了一套多功能的多功能红外真空系统，用于观察反应中间体的配位、能态和结构，并在反应室中对反应物在大气环境中的表面反应进行了原位观察。离子分析器采用脉冲电子束，时间分辨率可达20 ms。作为该系统的发展，利用扫描隧道谱（STM）研究了烷基镓化合物在Si（111）-（7*7）表面的热诱导和光诱导反应。对单个三甲基镓和三乙基镓分子的分解进行成像。甲酸盐是一种简单的有机分子，在TiO_2（110）上吸附的甲酸盐也被成功地操纵。

The investigators developed a Time-of-Flight Fourier Transformed Ion Energy Analyzer for space-resolved and energy-resolved observation of products in electron-or photo-stimulated desorption. In the present project, a multi-functionalized ultrahigh vacuum system was built to observe the coordination, energy state, and structure of absorbed reaction intermediates, by combining the analyzer with an Reflection Absorption Infared Spectroscope (RAIRS) .The RAIRS with a reaction chamber allowed us to observe in-situ surface reaction in atmospheric reactant ambient. The ion analyzer operated with pulsed electron beam enabled the detection of reaction intermediate in a time resolution as small as 20 ms.As the developing the system, thermal and photo induced reaction of alkygallium compounds on a Si (111) - (7*7) surface was studied by scanning tunneling spectroscopy (STM) . The decomposition of individual trimethylgallium and triethylgallium molecule was imaged. The manipulation of adsorbed formate, a simple organic molecule, was also successfully examined on TiO_2 (110) .