基片温度和退火对DdIn2O4薄膜光学性质和载流子浓度的影响

对射频反应性溅射Cd-In合金靶制备的透明导电CdIn2O4薄膜，研究了基片温度及沉积后在氩气流中退火对薄膜的透射、反射和吸收光谱，光学常数和载流子浓度的影响。结果表明：提高基片温度减少了薄膜的载流子浓度，退火增加了薄膜的载流子浓度。随着基片温度提高，薄膜折射率n和消光系数κ的短波峰将逐渐蓝移，而退火使其出现红移。基片温度和退火对薄膜光学常数的影响与其对薄膜载流子浓度的影响是一致的。在制备CdIn2O4这样一种对于沉积方法和沉积条件极为敏感的透明导电薄膜的沉积过程中，这一现象对于实时监控具有极为重要的意义。     

Experimental Observation of Constructive Quantum Interference via Hybrid Excitation in an Na2-Na System

We report on an experimental observation of constructive quantum interference between two atomic transition pathways 3P1/2-5S (or 4D) and 3P3/2-5S (or 4D) via equal-frequency hybrid excitation and collision-aided radiative excitation in an Na2-Na system.Through the special excitation processes,constructive quantum interference is realized for a Λ-type quantum-beat configuration with a widely-spaced doublet (about 17cm^-1) in the excited sodium atom driven by one laser.The dependences of quantum interference on the argon buffer gas pressure and sample temperature are also examined.     

Effect of N2 Plasma Annealing of Properties of Fluoring Doped Silicon Dioxide Films with Low Dielectric Constant for Ultra—Large—Scale Integrated Circuits

The influence of N2 plasma annealing on the properties of fluorine doped silicon oxide (SiOF) films is investigated.The stability of the Dielectric constant of SiOF film is remarkably improved by the N2 plasma annealing.After enduring a moisture absorption test for six hours in a chamber with 60% humidity at 50℃,the dielectric constant variation of the annealed SiOF films is only 1.5%,while the variation for those SiOF films without annealing is 15.5%.Fourier transform infrared spectroscopic results show that the absorption peaks of Si-OH and H-OH of SiOF films are reduced after the N2 plasma annealing because the annealing can wipe off some unstable Si-F2 bonds in SiOF films.These Unstable Si-F2 bonds are suitable to react with water,resulting in the degradation of SiOF film properties.Therefore,the N2 plasma annealing meliorates the properties of SiOF films with low dielectric constant.     

Influences of Thalliation on the Morphology and Critical Temperature of Tl2Ba2CaCu2O8 Thin Films

Tl2Ba2CaCu2Ox(Tl-2212) thin films were prepared by the two-step technique.A precursor film was first prepared by the pulsed laser deposition method,and then experienced the incorporation of thalliation in a one-step or two-step annealing process.The experimental results show that the two-step annealing process produces dense and smooth films,and that the one-step annealing process produces a high critical temperature film of 101K,but the transition width is wide.Precursor films with homogeneous Ba2Ca1.3Cu2.1Ox composition are essential for producing high-quality Tl-2212 films.     

Effect of Substrates on CuInSe2 Nanoparticle Thin Films by Radio Frequency Reactive Sputtering

CuInSe2(CIS) nanoparticle thin films have been prepared by radio frequency reactive magnetron sputtering from compound ternary fan-shaped targets on low-temperature substrates with pure argon gas as the atmosphere.The stoichiometry of the ternary compound semiconductor quantum dots can easily be controlled by the ratios of the ternary elements and sputtering parameters.CIS nanoparticle thin films regularly shaped and distributed reasonably uniform in size on substrates of 7059 glass etc can be grown in this way.The average particle diameter can be varied between 40-80 nm by an appropriate choice of the substrate temperature,power density and total CIS coverage.the optical and electrical properties of the CIS films have also been studied.     

sl玻色子体系在U(2l+1)→O(2l+2)过渡区的严格解

利用无穷维李代数方法得到了相互作用sl玻色子体系在U(2l+1)→O(2l+2)过渡区的能谱和波函数的严格解. 给出了该系统Bethe假定方程的数值解法.     

1-(2,6-二溴-4-硝基苯)-3-(4-硝基苯)-三氮烯与锌的显色反应研究

研究了 1- (2 ,6-二溴 - 4 -硝基苯 ) - 3- (4 -硝基苯 ) -三氮烯 (DBNPNPT)与锌的显色反应。在表面活性剂Triton X- 10 0的存在下 ,p H=9.0— 11.0的 Na2 B4 O7- Na OH介质中 ,DBNPNPT与锌 ( )可生成橙黄色络合物。建立以 5 35 nm为参比波长 ,4 4 0 nm为测定波长的双峰双波长测定法 ,该络合物的表观摩尔吸光系数为 1.34× 10 5L· mol-1· cm-1。对葡萄糖酸锌中的锌直接测定 ,结果令人满意     

Eu2O3纳米晶谱带特征及光伏性质的研究

利用表面光电压谱技术对不同粒径的Eu2O3纳米晶进行光吸收特性的研究，并结合紫外－可见反射吸收光谱对其谱带进行解析，实验发现，随着样品粒径的变小，部分f→f跃迁的吸收带明显增加强并发生红移；在300－500nm区间有一个宽吸收边带，此带可归属于O2p→Eu4f的电荷转移跃迁。     

铕(Ⅲ)-2-(5-溴-2-吡啶偶氮)-5-二乙氨基苯酚-溴化十六烷基三甲铵显色反应的研究

研究了铕 ( ) - 5 - Br- PADAP- CTMAB体系的显色反应和光度性质 ,并探讨了其最佳的光度分析条件。在 p H =5 .0的 HAc- Na Ac缓冲溶液中 ,有表面活性剂 CTMAB存在的条件下 ,Eu( )与 5 - Br-PADAP形成了配位比为 1∶ 2的深红色络合物。配合物的最大吸收峰位于 5 98nm,表观摩尔吸光系数为1.5 9× 10 5L· mol-1· cm-1,铕含量在 0— 10μg/ 2 5 m L范围内符合比耳定律。加标回收实验结果令人满意。     

4-(2-吡啶偶氮)-间苯二酚光度法测定煤灰中钒

在 0 .6 mol· L-1的硫酸介质中 ,钒 - PAR-羟胺生成红色络合物 ,最大吸收波长为 5 5 0 nm,摩尔吸光系数ε=1.91× 10 4L· mol-1· cm-1,钒含量在 0— 80μg/ 2 5 m L范围内符合比耳定律。本方法灵敏、简便 ,用于测定煤灰中的钒 ,结果满意