数字光电效应实验仪的设计

通过对GP -1型光电效应实验仪经常出现问题的分析 ,提出了数字光电效应实验仪的设计原理和具体电路 ,并且利用数字光电效应实验仪测量了相应的实验数据 ,结果表明该设计方案简洁可行。     

SSRF中高热载挡光器的热-应力分析

上海同步辐射装置（SSRF）为第三代同步辐射装置，其设计能量为3．5GeV，最大流强为300mA，SSRF中生物大分子光束线（U21）的前端区将接收总功率为4．36kw、峰值功率密度高达44kW／mrad^2的光束，前端装置中的挡光器将阻挡全部的光束，所以挡光器的热-应力分析在前端区设计中是非常关键的．通过有限元方法，分析了挡光器在热交换系数为0．015W／mm^2、冷却水温度为30℃的工作条件下，挡光器的最高温度、最高冷却槽壁温以及最大热应力．分析结果得出挡光器的应力问题是挡光器设计的难点，为了减小挡光器工作时的热应力，对挡光器的结构进行了改进，并给出了其热-应力分析结果．     

一种新型同步辐射第一晶体驱动转轴系统

以研究第三代同步辐射双晶单色器第一晶体新型转轴驱动系统为目的．分析了现有技术，阐述了新型第一晶体驱动转轴系统的原理、结构及其创新特点．研究结果表明，此种机构，运转灵活，无泄漏，完全符合第三代同辐射光源的使用要求．     

Adsorption and reaction of CO and O2 on the Ag/Pt(110) surface studied by photoemission electron microscopy

The Ag/Pt(110) model catalyst was prepared by evaporating silver on Pt(110). Adsorption and reaction of CO and O₂ on Ag/Pt(110) surface were studied in situ by photoemission electron microscopy (PEEM) during the pressure range of 10^-5——10^-2 Pa at 480 K. The Ag/Pt(110) surface consisted of Pt(110), AgPt interface and Ag area after annealing at 500 K. The dosing pressure of CO and O₂ had a larger influence on their adsorption on the Ag area than on the Pt(110) and AgPt interface. Small Pt clusters formed on the Ag area and AgPt interface, which had a stronger ability to adsorb CO than Pt(110) terrace. The existence of Ag had an obvious influence on the kinetic of CO oxidation on Pt(110). No pattern was observed on the AgPt interface under the same condition when the formation of reaction-diffusion waves occurred on Pt(110).     

Synchrotron radiation XRF microprobe investigation of elemental distribution in femoral head slice with osteoporosis

This note deals with the scanning of femoral head slices from both normal and osteoporosis subjects using synchrotron radiation X-ray fluorescence (SRXRF) microprobe technique. The sample preparation and experimental apparatus are described in detail. The quantitative computerized tomography (QCT) of elemental distribution, such as Ca, P, K, Fe, Zn, Sr and Pb in bone slice tissue including cartilage, substantial compact and substantial spongy, is investigated. Combined with the correlation between P, K, Zn, Sr and Ca, the loss way of minerals and the physiological functions of some metal elements in bone are also discussed.     

Growth of centimeter-sized C60 single crystals

C60 single crystals larger than one centimeter in size are grown with vapor method by nucleation control and by a proper time-dependent temperature process which allows only one nucleus growing larger and larger. X-ray diffraction patterns exhibit the high quality of the sample. As an example of the applications of large single C60 crystals,svnchrotron radiation photoemission spectra are measured to investigate the fine structure of valence bands of C60 crystals.     

C60粉末压片的同步辐射真空紫外反射光谱

利用同步辐射光源,测量了Ｃ６０粉末压片在５０－２５０ｎｍ波长范围内的真空紫外反射光谱,并依据Ｋｒａｍｅｒｓ－Ｋｒｏｎｉｇ关系,计算出吸收光谱。获得的１０个吸收峰,均与等离子体的元激发和从价带向π＾＊或σ＾＊带的不同带间跃迁有关。     

利用同步辐射XRD研究BiFeO3 外延多铁薄膜的微结构

使用脉冲激光沉积在SrTiO₃ 衬底上生长了不同厚度的BiFeO₃(BFO)薄膜, X 射线衍射分析表明薄膜是BFO 外延薄膜. X 射线反射率测量发现BFO 薄膜密度随着厚度的增加而增加, 同时薄膜表面存在厚度为数纳米的非设计覆盖层. 随着厚度的增加, BFO 薄膜由完全应变过渡到应变部分弛豫状态, 同时BFO 从四方相转变为单斜相.     

变包含角平面光栅单色器及其关键技术

分析设计并研制了上海光源软X 射线谱学显微光束线站的变包含角平面光栅单色器, 经过精密加工调试, 保证了扫描系统的转角重复精度; 采用多孔腔内部通道水冷方法, 控制了镜子表面热变形; 完成真空箱体大尺寸方法兰加工与密封, 达到了单色器工作所需的超高真空. 通过上述关键部件的精确掌控, 确保了单色器主要性能——光子能量范围、能量分辨率和能量重复性, 均优于设计指标.     

阈值光电子-光离子符合速度成像技术的初步应用

基于同步辐射的闲值光电子-光离子符合速度成像技术采用双速度聚焦电场同时控制电子和离子的飞行轨迹,提高了收集效率和能量分辨率.应用该技术开展了一些原子和分子的实验研究,分别测量了相应的阈值光电子谱、阈值光电子-光离子符合质谱、阈值光电子-光离子符合光谱和阈值光电子-光离子符合速度成像,展现了该技术在离子结构分析、混合物成分辨别和具有态选择的离子解离动力学等方面的初步应用.