乙烯在Ru(1010)表面价带电子特性研究

在200K以下乙烯(C2H4)可以在Ru(1010)表面上以分子状态稳定吸附,200K以上乙烯发生了脱氢分解反应生成乙炔(C2H2).乙烯分解生成乙炔后,σCC和σCH分子轨道能级向高结合能方向分别移动了0.5和1.1 eV.偏振角分辨紫外光电子谱(ARUPS)结果表明:在Ru(1010)表面上,乙烯和脱氢反应后生成的乙炔分子的C-C键轴都不平行于表面,而是沿表面(0001)晶向倾斜.     

弧光放电法原位清洗光学元件

光学元件受到污染后其光学性能会变差，如何对其进行清洗，尽可能地恢复其原来的性能，使其能够重新使用显得很重要。本文介绍—种碳污染的原位清洗方法——射频弧光放电法，利用原子氧与光学元件表面所沉积的碳反应以达到清洗的目的。清洗装置建立后对北京同步辐射装置（BSRF)上所使用的光学元件进行了清洗，取得了较好的效果。     

489B束线低能分支的性能改进

分析了北京同步辐射实验室489B原束线低能分支的构造及弊病，在不影响束线高能分支性能及总体机械结构的基础上提出了改进方案，详细介绍了该设计方案和光束线调试工作及出光后束线的性能测试工作，该测试结果完全符合束线的设计，该束线在同步辐射专用光实验中充分发挥了改进后的优势，取得了令人满意的结果。     

4B9B束线低能分支的性能改进

分析了北京同步辐射实验室4B9B原束线低能分支的构造及弊病,在不影响束线高能分支性能及总体机械结构的基础上提出了改进方案.详细介绍了该设计方案和光束线调试工作及出光后束线的性能测试工作,该测试结果完全符合束线的设计.该束线在同步辐射专用光实验中充分发挥了改进后的优势,取得了令人满意的结果     

Self—assembly and photoelectric properties of cerium compleses with 3,4,9,10—perylenetetracarboxylic acid on nanocrystalline TiO2 films

Self-assembled(SA)films (PMP,M=Ce^3 or Ce^4 )of 3,4,9,10-perylenetetracarboxylic acid(PTA)on nanocrystalline TiO2 films with Ce^3 or Ce^4 as a bridge were fabricated and characterized with UV-Vis,IR,and XPS synchrotron radiation photoelectron spectroscopy (SRPES) which gave the HOMO energy levels for the SA films.It was shown that thin-layer sndwich-type solar cells based on these SA films possess good properties for photoelectric conversion.While PTA-loaded TiO2 electrode(P) generated 26.9?f incident monochromatic phototo-to-electron conversion efficiency (IPCE),PMP-sensitized TiO2 electrodes yielded 55.8?and 39.1?for Ce^4 and Ce^3 respectively.PMP films can be considered as a kind of complexes whose HOMO energy levels were proved to eb higher than that of film P,which is one of the major reasons for the increase in IPCE form film P to film PMP.     

GaN表面极性的光电子衍射研究

利用x射线光电子衍射的极角扫描模式,采集了GaN（0001）表面由(1010)和(1120)晶面产生的光电子衍射实验曲线,并运用光电子衍射的前向聚焦效应确定了GaN(0001)表面是Ga在最外层的极性面.利用与能量有关的光电子衍射即角分辨光电发射精细结构谱技术并结合多重散射团簇模型计算对GaN(0001)表面的极化性质进行了研究,进一步证实了GaN表面是Ga在最外层的极性面. 关键词： GaN 表面极性 光电子衍射     

乙烯在Ru( )表面价带电子特性研究

在200K以下乙烯（C2H4）可以在Ru（1010^-）表面上以分子状态稳定吸附,200K以上乙烯发生了脱氢分解反应生成乙炔（C2H2）。乙烯分解生成乙炔后,σCC和σCH 分子轨道能级向高结合 能方向分别移动了0.5和1.1eV。偏振角分辨紫外光电子谱（ARUPS）结果表明：在Ru(10106-)表面上,乙烯和脱氢反应后生成的乙炔分子在C－C键轴都不平行 于表面,而是沿表面<0001>晶向倾斜。     

Self-assembly and photoelectric properties of cerium complexes with 3,4,9,10-perylenetetracarboxylic acid on nanocrystalline TiO_2 films

Self-assembled (SA) films (PMP, M = Ce3+ or Ce4+) of 3,4,9,10-perylenetetracarboxylic acid (PTA) on nanocrystalline TiO2 films with Ce3+ or Ce4+ as a bridge were fabricated and characterized with UV-Vis, IR, and XPS synchrotron radiation photoelectron spectroscopy (SRPES) which gave the HOMO energy levels for the SA films. It was shown that thin-layer sandwich-type solar cells based on these SA films possess good properties for photoelectric conversion. While PTA-loaded TiO2 electrode (P) generated 26.9% of incident monochromatic photon-to-electron conversion efficiency (IPCE), PMP-sensitized Ti02 electrodes yielded 55.8% and 39.1% for Ce4+ and Ce3+ respectively. PMP films can be considered as a kind of complexes whose HOMO energy levels were proved to be higher than that of film P, which is one of the major reasons for the increase in IPCE from film P to film PMP.     

K/Ru(10(1-)0)表面上的CO-4a1轨道对称性确定

用同步辐射角分辨偏振紫外光电子谱对K/Ru(10(1-)0)面上吸附的CO分子轨道的对称性测量发现:结合能在11.2eV的CO-4a1(4σ)分子轨道对s偏振光(在沿<1(2-)10>的入射面)是禁戒的.结果表明由于K的强烈影响,CO的分子轨道重新排列(sp2杂化).依据选择定则和分子轨道的对称性说明,sp2再杂化的CO分子吸附的桥位取向是<1(2-)10>晶向.     

C60单晶价带色散的同步辐射光电子谱研究

测量了C₆₀单晶(111)解理面法向发射的角分辨光电子谱.利用同步辐射光源研究了对应于分子轨道HOMO及HOMO-1的能带的色散关系.实验观察到HOMO和HOMO-1能带在Γ—L方向存在明显的色散,最大色散分别为027eV和042eV.色散曲线与理论电子结构基本符合. 关键词：