取代环戊二烯基铬,钼或钨羰基物和有机铁硫砷簇合物UV—VIS…

通过对三种类型十个有机族合物在十种有机溶剂中紫外－可见光谱的测试及计算机辅助处理，得到了族合物在一些溶剂中ＵＶ－ＶＩＳ谱ＣＴ带的ｖｍａｘ／ｃｍ＾－１和溶剂极性参数（ｎ＾２－１）／（２ｎ＾２＋１），Ｚ值之间存在着好的性关系，其相关系分别到了０．９８４－０．９９０。本文还对ＣＴ带的ｖ／ｃｍ＾－１和（ｎ＾２－１）／（２ｎ＾２＋），Ｅｔ（３０）进行了二元线性回归处理，得到了更好的线性关系，相关系数为０．９     

二溴邻羧基苯基重氮氨基偶氮苯光度法测定微量Cu（Ⅱ）的研究

本文报道了新显色剂二溴邻羧基苯基重氮氨基偶氮苯（ＤＢ－Ｏ－ＣＤＡＡ）与铜（Ⅱ）的显色反应及分析应用，研究结果表明，在ＴｒｔｉｏｎＸ－１００的存在下，于ｐＨ１０．０的Ｎａ２Ｂ４Ｏ７－ＮａＯＨ缓冲介质中，Ｃｕ（Ⅱ）与试剂形成１：２的红色配合物，配合物λｍａｘ＝５３０ｎｍ，表观摩尔吸光系数为１．０８×１０＾５Ｌ／ｍｏｌ．ｃｍ，铜量在０－０．３２μｇ／ｍＬ，范围内遵循比尔定律，方法用于合金及合成水样中微量     

邻二氮菲－溴甲酚绿三元配合物分光光度法测定肿瘤中微量锌

本文介绍锌和邻二氮菲－溴甲酚绿在氨性缓冲液中形成三元配合物增溶于聚乙烯醇ＰＶＡ＿（１２４）体系，直接在水相中测其吸光度。配合物最大吸收位于６１２ｎｍ处，表观摩尔吸光系数ε＿（６１２）＝１．６３×１０￣６Ｌ·ｍｏｌ￣（－１）·ｃｍ￣（－１）。锌浓度在０－１．２μｇ／２５ｍＬ范围内与吸光度呈线性关系。用此法分析良／恶性肿瘤细胞切片中锌含量，获得良好的结果。     

银－2－羧基－4－溴苯基重氮氨基偶氮苯－Triton X－100－SDS显色体系的研究及应用

新三氮烯类试剂之一，２－羧基－４－溴苯基重氮氨基偶氮苯，在ｐＨ１１．０的Ｎａ_２Ｂ_４Ｏ_７－ＮａＯＨ缓冲介质中，有非离子表面活性剂ＴｒｉｔｏｎＸ－１００及阴离子表面活性剂ＳＤＳ的共同存在下，可与Ａｇ（Ⅰ）生成稳定的２∶１红色配合物，红色配合物的λ_（ｍａｘ）＝５４０ｎｍ，表观摩尔吸光系数ε_（５４０）＝１．１０×１０￣５Ｌ·ｍｏｌ￣（－１）·ｃｍ￣（－１）。Ａｇ量在０－１０μｇ／２５ｍＬ符合比尔定律。方法用于工业废水中痕量Ａｇ的测定，结果满意。     

银—2—羧基—4—溴苯基重氮氨基偶氮苯—TritonX—100—SDS显色体系的研究及应用

新三氮烯类试剂之一，２－羧基－４－溴苯基重氮氨基偶氮苯，在ｐＨ１１．０的Ｎａ２Ｂ４Ｏ７－ＮａＯＨ缓冲介质中，有非离子表面活性剂ＴｒｉｔｏｎＸ－１００及阴离子表成活性剂ＳＤＳ的共同存在下，可与Ａｇ（Ｉ）生成稳定性的２：１红色配合物，红色配合物的λｍａｘ＝５４０ｎｍ表观摩尔吸光系数ε＝５４０＝１．１０×１０＾５Ｌ．ｍｏｌ＾－１．ｃｍ＾－１，Ａｇ量在０－１０μｇ／２０ｍＬ符合比尔定律，方法用于工业废水中     

双显色剂协同显色光度法测定锡

在ｐＨ ５．０ 的ＮａＡｃ－ＨＡｃ缓冲溶液中, ＰＶＡ 存在时, 锡和邻苯二酚紫（ＰＶ） 与罗丹明Ｂ（ＲｈＢ） 生成离子缔合物, 其组成为Ｓｎ∶ＰＶ∶ＲｈＢ＝ １∶２∶４。缔合物最大吸收波长为５６０ ｎｍ , 表观摩尔吸光系数ε＝１．１８×１０５ Ｌ·ｍ ｏｌ－ １ ·ｃｍ － １ 。锡量在０～１５ μｇ／２５ｍ Ｌ范围内符合比耳定律。拟定方法已用于某些样品中微量锡的测定, 结果满意。     

Al(Ⅲ)-CAS-OP-PVA体系分光光度法测定沸石分子筛中的铝

研究了在聚乙二醇辛基苯基醚（乳化剂ＯＰ）及聚乙烯醇（ＰＶＡ）存在下铝（Ⅲ）与铬天青Ｓ（ＣＡＳ）的显色反应。在ｐＨ５．３的ＨＡｃ－ＮａＡｃ缓冲介质中，题示体系最大吸收波长λｍａｘ＝６１２ｎｍ，对比度Δλ＝１０２ｎｍ，表观摩尔吸光系数ε６１２ｎｍ＝２．８４×１０４Ｌ·ｍｏｌ－１·ｃｍ－１。铝（Ⅲ）浓度在０－０．６０μｇ／ｍＬ范围内遵守比耳定律。本法已成功地用于沸石分子筛中铝含量的测定，结果良好。该法具有稳定性高、准确度好的特点。     

直接激光气化法产生气相MnCl2团簇的研究

报道了５３２ｎｍ激光气化ＭｎＣｌ２．４Ｈ２Ｏ固体产生气相团簇，（ＭｎＣｌ２）ｎＭｎ＾＋，（ＭｎＣｌ２）ｎＭｎＣｌ＾＋（ＭｎＣｌ２）ｎＣｌ＾－（ｎ＝１～１２），以及溶剂化的团簇ＭｎＣｌ＾＋（ＭｎＣｌ２）ｎ（Ｈ２Ｏ）ｍ（ｎ＝１～７，ｍ〈６）的机理，通过用飞行时间质谱考察团簇物尺寸大小与激光能量，激光与脉冲加速电场之间延迟的等关系，认为这些团簇是通过气相化学反应逐步生长的，并提出了正负团族离子产生的可能     

铂(Ⅳ)-钼酸盐-乙基罗丹明B离子缔合显色反应研究

本文研究了在聚乙烯醇（ＰＶＡ）存在下用钼酸盐与乙基罗丹明Ｂ（ＥＲＢ）形成离子缔合物，该缔合物的最大吸收位于５８０ｎｍ，摩尔吸光系数为１．１２×１０６Ｌ·ｍｏｌ－１·ｃｍ－１，服从比耳定律范围０—２．５μｇ／２５ｍＬ，缔合物至少稳定１周，考察了５０多种共存离子的影响，除生成杂多酸元素和Ａｕ（Ⅲ）、Ｏｓ（Ⅷ）、Ｐｄ（Ⅱ）、Ｉｒ（Ⅳ）外，大多数元素不干扰。测定铂的条件为：〔ＨＣｌＯ４〕＝１．２ｍｏｌ／Ｌ，〔ＭｏＯ４２－〕＝９．１×１０－４ｍｏｌ／Ｌ，〔ＥＲＢ〕＝３．２×１０－５ｍｏｌ／Ｌ，０．０８％ＰＶＡ。缔合物的摩尔比为Ｐｔ（Ⅳ）∶ＥＲＢ＝１∶２，本法已用于铂矿中铂的测定，结果满意。     

DBC-偶氮胂光度法测定人发中微量铋

ＤＢＣ－偶氮胂对铋的灵敏度较高且选择性好，在０．２－１．０ｍｏｌ／Ｌ硝酸介质中与Ｂｉ形成配位比为１：２的紫红色配合物，λｍａｘ＝６３０ｎｍ，ε６３０＝８．８×１０＾４Ｌ．ｍｏｌ＾－１．ｃｍ＾－１。铋量在０－＝１０μｇ／１０ｍＬ范围内符合比耳定律。用于人发中微量的铋的测定，操作简便，结果满意。     

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.     

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.     

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.     

Improvement of four-wave mixing-based wavelength conversion efficiency in dispersion shifted fiber by 40-GHz clock pumping

40-GHz clock modulated signal as a pump to improve the efficiency of four-wave mixing (FWM)-based wavelength conversion in a 26.5-km dispersion shifted fiber (DSF) is investigated. The experimental results demonstrate that the conjugated FWM component has higher intensity with the clock pumping than that with the continuous-wave (CW) light pumping. The improvement of FWM-based wavelength conversion efficiency is negligible when the pump power is less than Brillouin threshold. But when the pump power is greater than Brillouin threshold, the improvement becomes significant and increases with the increment of pump power. The improvement can increase up to 9 dB if pump power reaches 17 dBm.     

Characterization of PolyA and PolyC mismatches by Raman spectroscopy

A.C mismatches are studied by Raman spectral characterization of PolyA, PolyC, and their equimolar complex in solution of 0.14 mol/L Na ,pH7.0.Experimental results show that A·C mismatches occur to be A/B (mainly A) conformers, and unlike Watson-Crick base pairing, this kind of mismatches is stabilized by only one hydrogen bond involving cytosine N4H2 and adenine N7.The formation of A·C complex makes the base stacking interactions much stronger, and conformation of the backbone more ordered, which leads to obvious Raman hypochromic effect with some shifts in corresponding bands.