激光径向偏振光栅反射镜的研究

径向偏振光是近些年引起广泛关注的一种新型偏振光,它在粒子操控、金属切割和提高显微镜分辨率方面具有广阔的应用前景。径向偏振光可以通过在激光器谐振腔内应用径向偏振光栅反射镜来获得。首先在顶层刻蚀光栅反射镜的模型上通过自编程序分析光栅反射镜各参数对光栅性能的影响,然后设计出光栅反射镜复合结构并结合微纳加工工艺进行了可行性分析。     

对氨基偶氮苯的同步辐射光电离与光离解

In this paper, the photoionization and photodissociative ionization processes of p-aminoazobenzene (pAAB, C12H11N3) using coincidence technology with vacuum ultraviolet synchrotron radiation (SR) photoionizaton mass spectroscopy are reported. The ionization potential (IP) of this molecule and the appearance potentials (AP) of the important ionic fragments from the SR photodissociative ionization of pAAB have been measured. On the basis of the IP(C12H11N3) and AP measured in this experiment and the IP(C6H5) from the literature, the dissociative energy D 0(C 6H 5-N 2C 6H 4NH 2),D 0(C 6H + 5-N 2C 6H 4NH 2),D 0(C 6H 5-N 2C 6H 4NH + 2),D 0(C 6H 5N 2-C 6H 4NH 2 +) and ionization potential of free radical N 2C 6H 4NH 2 have been evaluated. Based on the results of the mass spectroscopy of pAAB obtained with SR photoionization, the possible channels of photodissociative ionization of pAAB have been analyzed. The processes(molecular ions or the fregmental ions) giving rise to the ions C 6H + 5 and C 6H 6N + need further study.     

Study of the dose rate effect of 180 nm nMOSFETs

Radiation induced offstate leakage in the shallow trench isolation regions of SIMC 0.18 μm nMOSFETs is studied as a function of dose rate. A "true" dose rate effect (TDRE) is observed. Increased damage is observed at low dose rate (LDR) than at high dose rate (HDR) when annealing is taken into account. A new method of simulating radiation induced degradation in shallow trench isolation (STI) is presented. A comparison of radiation induced offstate leakage current in test nMOSFETs between total dose irradiation experiments and simulation results exhibits excellent agreement. The investigation results imply that the enhancement of the leakage current may be worse for the dose rate encountered in the environment of space.     

计算涡旋电场的二种方法

对于满足似稳条件的、由变化磁场所激发的涡旋电场,本文介绍了从场方程的微分形式及积分形式出发进行求解的方法.并对二种典型情况作了分析、计算.     

高Jc Tl系2223相银包套带材的磁通钉扎和耗散

测量了Ｔｌ系２２２３相银包套超导带（Ｊ_c＝１．５×１０^４Ａ·ｃｍ^-2，７７Ｋ，０Ｔ）在０－０．８Ｔ磁场下电阻转变展宽，实验结果引用热激活磁通蠕动模型加以解释。磁场平行于带面（Ｈ∥ａｂ面）和磁场垂直于带面（Ｈ⊥ａｂ面）两种情况下，激活能与磁场之间满足幂指数关系：Ｕ_0∥＝０．２１ H^-0.3(eV),Ｕ_0⊥＝０．１5 H^-0.4(eV)，其中Ｈ的单位为ｋＧ。 关键词：     

Cu~+、Ag~+、Au~+与乙硫醇的气相化学反应

利用激光溅射 分子束的技术 ,结合反射飞行时间质谱计 ,研究了Cu+、Ag+、Au+与乙硫醇的气相化学反应。结果显示这三种金属离子与 (CH3 CH2 SH) n 反应形成一系列团簇离子M+(CH3 CH2 SH) n,且团簇离子尺寸不一样。Ag+、Au+与乙硫醇的反应还生成了 (CH3 CH2 SH) +n ,由此推测Cu+、Ag+、Au+与乙硫醇团簇的反应存在两种通道 ,一种通道是生成M+(CH3 CH2 SH) n,另一种是生成 (CH3 CH2 SH) +n 。Cu+、Au+与乙硫醇的反应还生成了M+(H2 S) (M =Cu、Au) ,但是实验中没有观察到Ag+(H2 S) ,理论计算表明Ag+(H2 S)很不稳定。另外 ,分析产物离子M+(CH3 CH2 SH) n 的强度发现 ,n =1～ 2之间存在明显的强度突变现象     

Novel Properties of Photochromic Spirooxazine Nanoparticles

The nanoparticles of a spirooxazine （SPO） and its photomerocyanine （PMC） were prepared through the reprecipitation method. Two distinct features were observed. One is that the decaying lifetime for PMC nanoparticles was 600 times of that for the dispersed molecules, and the other is that the fluorescence intensity of SPO nanoparticles was enhanced by 240 times of that of the dispersed monomer.     

Ar?NO团簇的同步辐射光电离研究

利用国家同步辐射实验室合肥光源的真空紫外同步辐射，使NO分子和Ar原子混合物的超声分子束发生光电离，测量了Ar，NO和异类团簇Ar·NO的光电离效率谱. 在谱中，在与Ar原子的共振线对应的能量区域(11.5—12.0 eV)观察到一个强的类共振结构. 这个结果表明，在异类团簇Ar·NO的内部，稀有气体Ar原子的激发能转移到与它接触的分子NO上，使分子NO发生电离. 关键词： Ar·NO团簇 同步辐射 光电离 能量转移     

充分利用高新技术加快企业技术改造

常熟市盛昌稀土冶炼厂是离子型单一稀土萃取工艺的分离厂.自1995年5月开始接收原破产的工厂,当时企业领导就考虑如何在产品档次上下功夫,如何用优质的产品来占领市场,赢得客户的信誉.他们走遍了全国各地的外贸公司,听取了技术权威的意见,最后选中了北京大学的生产工艺.有关教授、博士亲自对原有设备进行脱胎换骨的改造,使之一跃进入一流的全萃取分离稀土企业,当年即分离稀土400t,实现销售收入4000万元,可以说是尝到了科技兴厂的甜头.