Researches of surface reaction processes using time-resolved electron energy loss spectroscopy

时间分辨电子能量损失能谱仪是一种新型仪器。所研制的分析仪具有位置敏感电子探测器，信号存储在直方图存储器中，存储器的一个分区的通道对应于能量损失谱，分区的编号对应于反应开始后的时间。这种时间相关的数据采集系统使测量时间分辨电子能量损失谱成为可能，其时间分辨为1 s数量级，比传统光谱仪短约100倍。由于红外反射吸收光谱和电子能量损失光谱在表面振动光谱中是互补的，我们还开发了一种结合红外反射吸收光谱和电子能量损失光谱的组合分析系统。用所建立的体系观察了CO_2和CH_4在Ag（111）表面物理吸附的振动模式。

Instrumental apparatus for time-resolved electron energy loss spectroscopy was newly developed. The developed analyzer has a position sensitive electron detector, and the signal is stored in a histogram memory in such way that channels of a partition of the memory are correspond to the energy loss spectrum, while the number of the partition corresponds to the time after the reaction started. This time dependent data acquisition system makes it possible to measure time-resolved electron energy loss spectra with the time resolution of the order of 1 s, which is about 100 times shorter than conventional spectrometers.We also developed a combinational analysis system using both infrared reflection absorption spectroscopy and electron energy loss spectroscopy, since they are complementary technique in surface vibrational spectroscopy. The vibrational modes of CO_2 and CH_4 physisorbed on a surface of Ag(111) were observed using the developed system.