Application of Time-Resolved Electron Spectroscopy to the Dynamics of Interfacial Excitation

(1)研制了时间分辨电子能量分析仪。该分析器由静电椭球镜分析器和带电粒子条纹相机组成，在宽接收角度和良好的时间分辨率之间表现出优异的性能。我们开发了非球面网格系统和四极静电透镜系统的制造新工艺。该光谱仪的时间分辨率为20ps，能量分辨率为10 eV。(2)固体表面的时间分辨电子能谱测量采用了两种方法。一种是测量核共振X射线散射下的内转换电子发射。该实验是在高能物理国家实验室(KEK)的AR光束线上进行的。第二个是美国国立分子科学研究院利用真空紫外光同步辐射进行固体表面的光电子发射。(3)研制了皮秒光电子源。对NEA-GaAs光电阴极的激活过程进行了深入的研究。用扫描隧道显微镜确定了单晶面的退火条件。阐明了活化气体压力和温度与阶跃聚束现象的关系。

(1) A time-resolved electron energy analyzer was developed. The analyzer consists of an electrostatic ellipsoidal mirror analyzer and a charged particle streak-camera and exhibits excellent performance compromising between wide acceptance angle and good time resolution. We have developed new fabrication process of non-spherical grid system and quadrupole electrostatic lens system. The time and energy resolution of the spectrometer is 20 ps and 10eV,respectively.(2) Measurement of time-resolved electron spectroscopy on solid surfaces was done in two ways. One is a measurement of internal conversion electron emission under nuclear resonant X-ray scattering. The experiment was made in an AR beamline of National Laboratory of High Energy Physics (KEK). The second one is a photoemission from solid surfaces by using VUV synchrotron radiation in the National Institute of Molecular Science.(3) A picosecond photo-electron source was developed. The activation process of NEA GaAs photocathode was extensively studied. The annealing condition of GaAs single crystal plane was determined by using a scanning tunneling microscopy. The dependence of activation gas pressure and temperatures on step bunching phenomena was clarified.