银溶胶吸附的R一藻红蛋白的表面增强共振拉曼散射

现已获得银溶胶吸附的Ｒ一藻红蛋白的表面增强共振拉曼散射（ＳＥＲＲＳ），在它的ＳＥＲＲＳ谱图上共有３５根谱线，而它的拉曼光谱图仅有一个“荧光包”，所有的谱线都被这个“包”所覆盖。由于银溶胶一藻红素复合物的形成及与ＳＥＲＳ的金属基活性表面的相互作用，该ＳＥＲＲＳ谱线增强及荧光淬灭。Ｒ一藻红蛋白是由藻红素和它周围的蛋白基质组成，但是在Ｒ一藻红蛋白的ＳＥＲＲＳ谱上仅有藻红素的一些谱线。这再一次表明在带有发色团组份的蛋白质（Ｒ一藻红蛋白）与银溶胶的结合中存在着竞争结合；发色团藻红素（ＰＥＢ）是对ＳＥＲＲＳ效应负主要责任的。因此，表面增强共振拉曼散射技术对研究带发色团的蛋白质是非常有用的     

大豆甙元成分的TLC—SERS研究

利用高效薄层色谱（ＴＬＣ）分离技术和表面增强拉曼散射技术（ＳＥＲＳ）的结合，获得了分析大豆甙元成分的新方法，ＳＥＲＳ结果表明，在ＴＬＣ原位的３μｇ样品就可获得大豆甙元的主要振动特征谱带，通过表面增强光谱揭示出，ＳＥＲＳ与固体光谱的异同，并指明了大豆甙元与银溶胶的吸附模式，ＴＬＣ－ＳＥＲＳ使高效分离与指纹性鉴定结合，可对化学成分进行高灵敏度的检测。     

应用TLC—FT—SERS对萝芙木中利血平成分的研究

本文报道了应用薄层色谱（ＴＬＣ）与傅里叶变换表面增强拉曼光谱（ＦＴ－ＳＥＲＳ）联用技术,获得了中草药萝芙木有效成分利血平光谱研究的新方法。研究表明：在薄层原位约２μｇ的样品即可获得利血平分子的特征振动谱带,并阐述了样品分子在表面增强基底银微粒表面的吸附模式,从而说明ＴＬＣ－ＳＥＲＳ结合对中草药化学成分进行高灵敏度指纹检测的可靠性和优越性。     

胆红素铬合物的表面增强拉曼光谱研究

本文通过对近红外激发傅里叶变换拉曼光谱（ＮＩＲ－ＦＴ－Ｒａｍａｎ）与表面增强拉曼散射（Ｓｕｒｆａｃｅ Ｅｎｈａｎｃｅｄ Ｒａｍａｎ Ｓｃａｔｔｅｒｉｎｇ,ＳＥＲＳ）技术的联用,没得胆红素及其络合物Ｎａ２ＢＲ,ＣａＢＲ与ＣｕＢＲ在银溶胶中的ＳＥＲＳ光谱。结果表明,这一类与胆结石密切相关的生物分子络合物具有不同的配位方式,且在银胶表面采取不同的吸附取向,并从配位化学角度初步解释了黑色结石的黑色成因。     

苯甲酸和对羟基苯甲酸对Cl^—在银表面上吸附竞争的SERS研究

对Ｃｌ＾－在银胶体系中与苯甲酸（Ｃ６Ｈ５ ＣＯＯＨ）和对羟基苯甲酸（ＨＯＣ６Ｈ４ＣＯＯＨ）在银表面上的相互作用和吸附竞争进行了研究，证实了Ｃｌ＾－对上述两类分子的ＳＥＲＳ信号增强具有明显的淬灭效应，１６４０ｃｍ＾－１振动所反映的Ｃｌ＾－存在前后－ＣＯＯ＾－与银表面相互作用强弱的变化，证实了Ｃｌ＾－促使分子从银表面脱附这一过程的存在，同时对－ＯＨ在其中的影响作了讨论。     

槲皮素的表面增强拉曼光谱研究

本文报告了利用高效薄层色谱（ＴＬＣ）分离技术和表面增强拉曼散射技术（ＳＥＲＳ）的结合，建立了分析中草药有效成分槲皮素的新方法。ＳＥＲＳ结果揭示出，在ＴＬＣ原位约３μｇ样品就可获得槲皮素的主要振动特征谱带。从而阐明了ＴＬＣ—ＳＥＲＳ的有效结合，可对中草药化学成分进行高灵敏度的检测。     

时间分辨表面增强拉曼光谱研究银电极表面硫脲和ClO_4~-共吸附层的结构

本文应用时间分辨表面增强拉曼光谱（ＴＲＳＥＲＳ）结合电位阶跃和电位扫描的方法，研究了硫脲和ＣｌＯ－４在Ａｇ电极表面的共吸附层结构。结果表明ＳＥＲＳ谱峰强度随电极电位的响应速率与电位阶跃扫描的方向有关，ＴＵ和ＣｌＯ－４在Ａｇ表面的共吸附层在不同的电位下存在两种不同的构型，并且两种构型之间转化的难易程度不同。     

氧化铌结构和酸性关系的研究

用不同制备方法获得了具有单一结构的氧化铌表面：（１）具有ＮｂＯ结构；（２）具有ＮｂＯ４四面体结构；（３）具有ＮｂＯ６八面体结构，用高分辨电子能量损失谱（ＨＲＥＥＬＳ）俄歇电子能谱（ＡＥＳ），紫外光电子能谱（ＵＰＳ）和离子散射谱（ＩＳＳ）研究了氧化铌表面结构和酸性的关系，四面体结构的ＮｂＯ４表面带有强的Ｌｅｗｉｓ酸性，甲醇分子在两种表面上的解离吸附，尤其在具有ＮｂＯ４结构的氧化铌表面上生成甲氧基量大     

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。     

Ag2O胶体上SERS增强机制的研究

通过研究分别加入Ｎａ２Ｓ２Ｏ３和ＮａＯＨ对Ａｇ２Ｏ胶体上吸附分子ＳＥＲＳ的影响以ＳＥＲＳ随时间的变化发现；Ａｇ２Ｏ作为ＳＥＲＳ的活性载体，化学增强起决定作用，吸附分子与Ａｇ２Ｏ胶体表面的小银离子簇（如Ａｇ＾４＋）形成或强或弱的难溶于水的银离子簇络合物，构成ＳＥＲＳ活性中心，它们之间的电荷转移是增强的重要因素，应用激发态电荷转移模型初步估算了Ｄ２６６分子增强因子的量级，得到了与实验值基本一致的结果。     

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.     

Femtosecond Transform-Limited Pulse Generation by Compensating for the Linear Chirp of SPM Spectra in Dispersion Shifted Fibers

A simple technique of pulse compression, based on the linear chirp compensation of self-phase modulation (SPM) spectra in dispersion shifted fibers, is demonstrated. The optimization procedure is carried out, for a short span of a single-mode fiber, using a parabolic law, which describes the behavior of the squared output pulse width versus the pump peak power in the case of Gaussian pulses. The experimental results give a minimum pulse duration of 233 fs, which is in good agreement with the model. Shorter and coherent pulses, down to 90 fs, have been obtained by inserting an interference filter at the optical output.     

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.     

Sorting of bending magnets for the SSRF booster

The Shanghai Synchrotron Radiation Facility(SSRF)booster ring,a full energy injector for the storage ring,is deigned to accelerate the electron beam energy from 150MeV to 3.5GeV that demands high extraction efficiency at the extraction energy with low beam loss rate when electrons are ramping.Closed orbit distortion(COD)caused by bending magnet field uniformity errors which affects the machine performance harmfully could be effectively reduced by bending magnet location sorting.Considering the affections of random errors in measurement,both ideal sorting and realistic sorting are studied based on measured bending magnet field uniformity errors and one reasonable combination of bending magnets which can reduce the horizontal COD by a factor of 5is given as the final installation sequence of the booster bending magnets in this paper.     

Theoretical analysis and simulation of conjugate heights for dual-conjugate AO system in lidar

A multi-conjugate adaptive optics （MCAO） can offer a possibility of widening field of view （FOV） characterized by the isoplanatic angle, and the choose of conjugate height becomes a basic problem for MCAO, which influences the size of iosplanatic angle. Considering the application of lidar, the isoplanatic angle＇s expressions of two deformable mirrors （DMs） MCAO for uplink and downlink are deduced. The effects of conjugate heights for dual-conjugate AO are thoughtfully discussed, and the isoplanatic angles are further analyzed. The results show that the isopanatic angle varies with the conjugate height and reaches the maximum as the conjugate height is at the optimal altitude. Moreover, the optimal conjugate height changes with the propagation distance.     

Quick single-photon detector with many avalanche photo diodes working on the time division

Due to the limit of response speed of the present single-photon detector, the code rate is still too low to come into practical use for the present quantum key distribution (QKD) system.A new idea is put up to design a quick single-photon detector.This quick single-photon detector is composed of a multi-port optic-fiber splitter and many avalanche photo diodes (APDs).Au of the ports with APDs work on the time division and cooperate with a logic discriminating and deciding unit driven by the clock signal.The operation frequency lies on the number N of ports, and can reach N times of the conventional single-photon detector.The single-photon prompt detection can come true for high repetition-rate pulses.The applying of this detector will largely raise the code rate of the QKD, and boost the commercial use.     

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.