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里叶变换离子能量分析仪，用于空间分辨和能量分辨观察电子或光刺激解吸的产物。在本项目中，通过将分析仪和反射吸收红外光谱仪(RAIRS)相结合，建立了一个多功能的超高真空系统，用于观察吸附的反应中间体的配位、能态和结构，并带有反应室，使我们能够在大气反应物环境中原位观察表面反应。用脉冲电子束工作的离子分析仪能够以20ms的时间分辨率检测反应中间体。随着系统的发展，用扫描隧道谱(STM)研究了烷基镓化合物在Si(111)-(7*7)表面上的热致和光诱导反应。对单个三甲基镓和三乙基镓分子的分解进行了成像。还成功地研究了吸附甲酸盐这一简单的有机分子在二氧化钛(110)上的操作。

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) .