析相光度法测定铜（Ⅱ）的研究

本文研究了Ｃｕ－ＰＥＧ－ＤＤＴＣ（铜试剂）（ＮＨ４）２ＳＯ４体系的析相光度法并应用于测定Ｃｕ。最宜酸度为３．６－９．０（ＮａＡｃ－ＨＡｃ，ＮＨ４Ｃｌ－ＮＨ３．Ｈ２Ｏ）缓冲溶液，其络合物的最大吸收位于４５０ｎｍ，表观摩尔吸光系数为９．０５×１０＾３Ｌ．ｍｏｌ＾－１．ｃｍ＾－１，Ｃｕ浓度在０－３０μｇ／Ｌ范围内服从比耳定律，铜与ＤＤＴＣ形成组成为１：２的稳定络合物。该方法用于铝合金中铜的测定，获得了满     

碘化银胶体上四苯基卟啉金属配合物的表面增强拉曼光谱研究

研究了四苯基卟啉金属配合物（ＭＴＰＰ,Ｍ＝Ａｇ,Ｍｇ,Ｃｕ,Ｐｄ）在Ａｇｌ胶体上的表面增强拉我谱（ＳＥＲＳ）。结果显示ＭｇＴＰＰ与基底发生金属交换生成ＡｇＴＰＰ,而在ＰｄＴＰＰ和ＣｕＴＰＰ上则未发现金属交换,除卟啉环的振动外,一些苯环振动带也被显著增强,在１４００～１６００ｃｍ＾－１范围,ＰｄＴＰＰ和ＣｕＴＰＰ的ＳＥＲＳ与ＡｇＴＰＰ有很大差别,可能反映了吸附分子在次甲基桥碳原子Ｃｍ附近立体构型的差     

氯化钾对银胶中碱性品红表面增强拉曼散射的影响

测量了银胶中碱性品红的表面增强拉曼散射（ＳＥＲＳ）光谱。系统考察了不同波长光激发下ＫＣｌ对碱性品红ＳＥＲＳ光谱的影响，给出了不同波长光激发下碱怀品红的１３６６ｃｍ＾－１和２４２ｃｍ＾－１峰相对强度随ＫＣｌ量（或浓度对数值）的变化曲线，５１４．５ｎｍ和６３２．８ｎｍ光激发的碱性品红的ＳＥＲＳ谱有明显差异，２４２ｃｍ＾－１峰与其他峰的相对强度发生变化。     

双水相体系中Cu(Ⅱ)的显色反应研究

本文研究了铬黑Ｔ（ＥＢＴ）作萃取剂和显色剂,在聚乙二醇－２０００（ＰＥＧ）－Ｎａ２ＳＯ４－ＥＢＴ双水相体系中Ｃｕ（Ⅱ）的显色反应条件及应用,实验结果表明,在ｐＨ８．５缓冲溶液中,将Ｃｕ（Ⅱ）络合物从水溶液中萃取到ＰＥＧ相,其最大吸收波长位于５６０ｎｍ,摩尔吸光系数为３．０５×１０＾４Ｌ·ｍｏｌ＾－１·ｃｍ＾－１,此法用于铝合金中铜的测定,获得了满意结果。     

含R2dtc配体和V=O基的金属簇红外光谱研究

本文报道两类含Ｒ２ｄｔｃ配体的金属簇的红外光谱特点及某些规律,含Ｒ２ｄｔｃ的立方簇合物在４００－５００ｃｍ＾－１有较宽而弱的吸收,可归结于Ｍ－μ３Ｓ振动。Ｍ－Ｓｄｔｃ在３３０－３８０ｃｍ＾－１,Ｃ－Ｎ振动在１４７０－１５１０ｃｍ＾－１。二甲基ｄｔｃ配体立方的ｖ（Ｃ－Ｎ）与ｖ（Ｃ＝Ｓ）比值他二烷基ｄｔｃ立方烷的相应振动分别蓝移和红移,可归结于甲基超共轭效应所致。「Ｖ２Ｃｕ２Ｓ４（Ｒ２ｄｔｃ）２（ＰｈＳ）２」＾２－和「ＶＣｕ４Ｓ４（Ｒ２ｄｔｃ）ｎ（ＰｈＳ）４－ｎ」＾３－（ｎ＝０,１,２）的Ｍ－μ３Ｓ振动分别出现在４８０和４６５ｃｍ＾－１,可作为区别两类化合物的一个指标。另一类含（Ｒ２ｄｔｃ）２Ｖ２Ｏ２（μ－Ｓ）２单元的金属簇中,Ｖ－Ｏ伸缩频率在８４４－９７０ｃｍ＾－１范围内,（Ｅｔ４Ｎ）「Ｖ２Ｓ２Ｏ３（Ｅｔ２ｄｔｃ     

CO（a）与CS2和CS传能反应中激发态碎片形成速率

本文利用流动余辉技术研究了亚稳态ＣＯ（ａ）与ＣＳ２和ＣＳ的传能反应，测定了反应产生的激发态碎片ＣＳ（Ａ）和ＣＳ（ａ）的形成速率常数。ＣＯ（ａ）与ＣＳ２传能反应中ＣＳ（Ａ）和ＣＳ（ａ）的形成速率常数分别为３．４６×１０＾－１１ｃｍ＾３·ｍｏｌｅｃ＾－１·ｓｅｃ＾－１和１．１４×１０＾－１０ｃｍ＾３·ｍｏｌｅｃ＾－１·ｓｅｃ＾－１。ＣＯ（ａ）与ＣＳ传能反应中ＣＳ（Ａ）和ＣＳ（ａ）的形成速率常数分别为１     

纳米锐钛矿的拉曼光谱特征

本文是采用化学沉淀法合成出２～４０ｎｍ的纳米锐钛矿,测定并研究了不同粒径的纳米锐钛矿样品及μｍ级和天然锐钛矿的拉曼光谱,结果表明：随着晶粒尺寸的减小,谱带强度大幅度降低,谱带蓝移。其中,１４３ｃｍ＾－１处谱带蓝移程度最大,达到１０ｃｍ＾－１（２ｎｍ锐钛矿和天然锐钛矿比较）;随着晶粒尺寸的减小,５１５和６３７ｃｍ＾－１处谱带蓝移达到一个最大值后,当粒度继续减小时,却产生红移;３９６ｃｍ＾－１谱带随着     

铜与2-羟基-3-羧基-5-磺酸基苯重氮氨基偶氮苯反应的分光光度法研究及应用

研究了铜与２－羟基－３－羧基－５－磺酸基苯重氮氨基偶氮苯（ＨＣＳＤＡＡ）的显色反应。在Ｔｒｉ－ｔｏｎＮ－１０１存在下和ｐＨ１０．４～１１．５的缓冲介质中，Ｃｕ２＋与ＨＣＳＤＡＡ形成１∶２的红色配合物，其最大吸收波长是５３０ｎｍ，对比度为１０２ｎｍ，表观摩尔吸光系数为１．３１×１０５Ｌ·ｍｏｌ－１·ｃｍ－１。铜在０～０．２４μｇ／ｍＬ范围内服从比尔定律。用于铅锌矿和花生中微量铜的测定，相对误差不大于３．７％，相对标准偏差不大于１．６％（ｎ＝６）。     

六亚甲基桥连的希夫碱及其锰（Ⅲ）络合物催化剂的红外光谱研究

研究了六亚甲基桥连的希夫碱及其锰（Ⅲ）络合物催化剂的红外光谱，对一些主要谱带进行了经验归属。配体的分子内氢键谱带出现在～３４３８ｃｍ－１（以ＬＨ为例），νＣ＝Ｎ谱带在～１６３０ｃｍ－１（以ＣＨ为例，下同），苯的特征谱带在～１５９８，～１４６９和～７５５ｃｍ－１，νＭｎ—Ｎ为主的复合振动在～３６９ｃｍ－１，δＭｎ—Ｎ为主的复合振动在～２４７ｃｍ－１，νＭｎ—Ｏ为主的复合振动在～３２９ｃｍ－１，δＭｎ—Ｏ为主的复合振动在～２７５ｃｍ－１，νＭｎ—Ｃｌ特征谱带在～３０３ｃｍ－１。与苯基锰（Ⅲ）卟啉络合物相比，νＭｎ—Ｎ特征谱带向高波数位移，νＭｎ—Ｃｌ特征谱带则向低波数有较大位移。     

碘分子离子对态的时间分辨谱

本文用激光脉冲多光子激发的技术获得了碘分子高激发态Ｆ＇（０＾＋ｕ）（Ｔｅ＝５１７０６．７ｃｍ＾－１）的布居，并对该态１０个荧光辐射（３１０ｎｍ带）的时间分辨谱进行了测量。采用二步三光子的非线性激发模型对荧光时间分辨谱的数据进行处理，得到了离子对态Ｆ＇（０＾＋ｕ）的３１０ｎｍ荧光带的辐射寿命。     

Guided-Wave Two-Dimensional Acousto-Optic Scanner Using Proton-Exchanged Lithium Niobate Waveguide

Two-dimensional scanning of a 0.6328 mum guided-light beam has been realized using noncolinear acousto-optic (AO) coplanar Bragg diffraction together with colinear AO guided-mode to substrate radiation-mode conversion in a Z-cut Xpropagation LiNbO3 proton-exchanged (PE) waveguide. The two surface acoustic (SAW) waves utilized are at the center frequencies of 500 and 200 MHz, propagating in the Y and X axes, respectively. Two-dimensional scanning of approximately 720 resolvable light beam spots, namely, 18 40 (horizontal vertical) scanning, has been demonstrated using a light beam of 1.0 mm aperture. The total number of resolvable beam spots can be greatly increased from 720 by simply utilizing SAW transducers of larger bandwidth and a light beam of greater aperture. It should also be possible to significantly increase the diffraction efficiency from 3 % by optimizing the parameters of the PE waveguide and the SAWs.     

Effect ofγ-radiation on the spectral luminescence characteristics of impure cadmium tungstate crystals

Results of a study of the effect of γ-radiation on the spectral luminescence properties of cadmium tungstate crystals doped with silver, bismuth, and molybdenum cations are presented. Spectral characteristics of the nondnnnoped crystals are briefly described. Absorption and photo and X-ray luminescence spectra of the crystals taken before and after exposure to γ-radiation (5.5·10⁴ Gy) are compared. It is found that the spectral characteristics of the crystals doped with silver, bismuth, and molybdenum cations do not change markedly after the exposure. The relation between the type of impurity-induced defects, individual characteristics of the impurity cations, and the character of the effect of γ-radiation on the spectral luminescence properties of impure crystals is analyzed (preliminarily). Translated from Zhurnal Prikladnoi Spektroskopii, Vol. 64, No. 1, pp. 55–60, January–February, 1997.     

Measurement of nonlinear coefficient of optical fiber based on small chirped soliton transmission

We measure the waveform and phase curves of short optical pulses before and after transmission over different lengths of fibers by use of the pulse analyzer with the frequency-resolved optical gating (FROG),and numerically simulate pulse evolution under the experimental conditions.The nonlinear coefficient of the fiber is given by comparing the experimental results with the numerical ones.Difference between the experiment and numerical simulation is analyzed.     

Resonance scattering of canonical elastic shells in absorbing fluid medium

Resonance scattering of elastic spherical shell and cylindrical shell while the surrounding fluid medium has absorption is studied. The normal mode solution derived using exact elastic theory and the separation of variables is still applicable. However, the scattering form function has to be modified for the absorbing medium, otherwise the unreasonable result would be obtained. The backscattering form function in the absorbing medium is redefined, and the form function of elastic spherical and cylindrical shell with vacuum or solid matter filled is calculated in various absorption conditions. The results show that the absorption of surrounding fluid leads to notable attenuation of the coincidence resonances in the mid-frequency, but it has a little influence on the low-frequency resonance scattering induced by the filler inside the shell.     

Single-beam self-referenced phase-sensitive surface plasmon resonance sensor with high detection resolution

A versatile and low-cost single-beam self-referenced phase-sensitive surface plasmon resonance(SPR)sensing system with ultra-high resolution performance is presented.The system exhibits a root-mean-square phase fluctuation of ±0.0028.over a period of 45 min.i.e.a resolution of±5.2×10-9 refractive index units.The enhanced performance has been achieved through the incorporation of three design elements:a true single-beam configuration enabling complete self-referencing so that only the phase change associated with SPR gets detected,a differential measurement scheme to eliminate spurious signals not related to the sensor response,and the elimination of retardation drifts by incorporating temperature stabilization in the liquid crystal phase modulato .Our design should bring the detection sensitivity of non-labeling SPR biosensing closer to that achievable by conventional fluorescence-based techniques.     

Influences of SiO2 protective layers and annealing on the laser-induced damage threshold of Ta2O5 films

Ta2O5 films are prepared on BK7 substrates with conventional electron beam evaporation deposition.The effects of SiO2 protective layers and annealing on the laser-induced damage threshold (LIDT) of the films are investigated.The results show that SiO2 protective layers exert little influence on the electric field intensity(EFI)distribution,microstructure and microdefect density but increase the absorption slightly.Annealing iS effective on decreasing the microdefect density and the absorption of the films.Both SiO2 protective layers and annealing are beneficial to the damage resistance of the films and the latter is more effective to improve the LIDT.Moreover,the maximal LIDT of Ta2O5 films is achieved by the combination of SiO2 protective layers and annealing.     

A stereo matching algorithm using multi-peak candidate matches and geometric constraints

Gray cross correlation matching technique is adopted to extract candidate matches with gray cross correla- tion coefficients less than some certain range of maximal correlation coefficient called multi-peak candidate matches. Multi-peak candidates are extracted corresponding to three closest feature points at first. The corresponding multi-peak candidate matches are used to construct the model polygon. Correspondence is determined based on the local geometric relations between the three feature points and the multi-peak candidates. The disparity test and the global consistency checkout are applied to eliminate the remaining ambiguous matches that are not removed by the local geometric relational test. Experimental results show that the proposed algorithm is feasible and accurate.     

Fiber Modal Index Measurements Based on Fiber Gratings

A novel method based on fiber gratings for measuring the effective indices of fiber modes is proposed. The effective index difference between the core mode and a cladding mode was obtained by analyzing the interference fringe of a pair of cascaded long-period fiber gratings. In order to extract the core mode index from the measured index difference, an index matching oil immersion method is proposed. By analyzing the interaction between the cladding mode and the oil applied on the cladding surface, the mode order and the effective index of the involved cladding mode might be calculated. Experimental results about the interference fringe shifts induced by the oil index and the oil-applied length are also presented.     

Optical Pulse Compression Schemes That Use Nonlinear Bragg Gratings

Nonlinear optical pulse compression of picosecond pulses typically requires long lengths of optical fiber and multiple components. Periodic structures, such as fiber Bragg gratings, are highly dispersive at wavelengths outside of the photonic bandgap. This implies that such gratings can be used as very short all-fiber compressors. In this paper a number of such compression schemes are reviewed involving uniform and nonuniform fiber Bragg gratings, relying on both soliton and nonsoliton compression principles. Experimental results supporting the corresponding underlying theory are also presented. Finally, an extension of one of the compression schemes is shown, which allows the generation of adjustable high-repetition rate soliton trains.