超快电子衍射仪理论及实验研究  

Theoretical and experimental research on ultrafast electron diffraction system

作　　者：王兴超[1,2] 田进寿[1] 刘虎林[1] 卢裕[1] 曹自强[3] 

机构地区：[1]中国科学院西安光学精密机械研究所瞬态光学与光子技术国家重点实验室,西安710119 [2]中国科学院大学,北京100049 [3]西安陆军学院教研部,西安710108

出　　处：《强激光与粒子束》2013年第7期1630-1634,共5页High Power Laser and Particle Beams

基　　金：国家自然科学青年基金项目(60901036)

摘　　要：研制一套同时具有时间分辨及空间分辨能力的超快电子衍射(UED)系统,理论时间分辨能力达到300fs,空间分辨能力160lp/mm,并对该系统进行了静态性能分析。实验表明,优化后系统电子束直径约为300μm,电子打靶角度约为0.09°,同时对x和y偏转板的灵敏度、电子束斑尺寸及位置稳定性进行定量分析,利用该系统进行多晶铝膜电子衍射实验,分析衍射图样表明系统最小可以分辨单个晶格间距的0.36%。An ultrafast electron diffraction system with both ultrafast temporal resolution and ultrahigh spatial resolution was established. The temporal resolution of the system is 300 fs and spatial resolution 160 lp/mm in theory. Investigation and optimization on spatial resolution of the system was performed. The experimental results demonstrate that the system can provide an electron beam diameter less than 300μm and an incidence angle less than 0.09°. The ay deflection plates and stability of the electron beam were quantitatively analyzed. The diffraction pattern of A1 was obtained by this system and it demonstrates that the system can distinguish diffraction peak position changes of 0.36 %.

关 键 词：超快电子枪 结构设计 偏转灵敏度 电子衍射 空间分辨率 

分 类 号：O463[机械工程—光学工程] TN16[理学—电子物理学]