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

时间分辨电子能量损失谱仪器是新近研制的。所开发的分析器具有位置灵敏电子检测器，并且以这样的方式将信号存储在直方图存储器中，即存储器分区的通道对应于能量损失谱，而分区的数目对应于反应开始后的时间。该时间相关数据采集系统能够测量时间分辨的电子能量损失谱，时间分辨率为1 S量级，比常规光谱仪缩短约100倍。我们还开发了红外反射吸收光谱和电子能量损失光谱的组合分析系统，因为它们是表面振动光谱中的互补技术。用该系统观察了CO_2和CH_4物理吸附在Ag(111)表面的振动模式。

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.