Dielectronic Recombination Rate Coefficients for Nickel-like Ytterbium

Ｄｉｅｌｅｃｔｒｏｎｉｃ　Ｒｅｃｏｍｂｉｎａｔｉｏｎ　Ｒａｔｅ　Ｃｏｅｆｆｉｃｉｅｎｔｓ　ｆｏｒ　Ｎｉｃｋｅｌ－ｌｉｋｅ　ＹｔｔｅｒｂｉｕｍＤｉｅｌｅｃｔｒｏｎｉｃＲｅｃｏｍｂｉｎａｔｉｏｎＲａｔｅＣｏｅｆｆｉｃｉｅｎｔｓｆｏｒＮｉｃｋｅｌ－ｌｉｋｅ...     

镍电极上表面拉曼光谱研究的新进展

镍电极上表面拉曼光谱研究的新进展黄群健黄开启田中群（厦门大学化学系固体表面物理化学国家重点实验室物理化学研究所厦门３６１００５）ＡＮｅｗＰｒｏｇｒｅｓｓｏｆＳｕｒｆａｃｅＲａｍａｎＳｐｅｃｔｒｏｓｃｏｐｉｃＳｔｕｄｉｅｓｏｎＮｉｃｋｅｌＥｌｅｃｔｒ...     

球状胶粒表面电荷密度／表面电势的一个近似解析式

应用Ｄｅｂｙｅ－Ｈｕ ｃｋｅｌ线性化近似求解非线性Ｐｏｉｓｓｏｎ－Ｂｏｌｔｚｍａｎｎ方程（ＰＢＥ），获得一个混合、非对称电解质溶液中球状胶粒表面电荷密度（σ）／表面电势（ψ０）的近似解析式。近似解析式适合于大ｋａ的情形，但对于小ｋａ的情形，数值试验表明：只要满足ｋａ≥０．０３，即使表面电势高达３３４ｍＶ（２５℃），近似解析式最大相对误差也低于５％；而文献上报道的其它近似解析式对ｋａ值的下限要求通常     

O（^1D）＋H2非绝热碰撞动力学的Ehrenfest模型研究

本采用Ｈ２Ｏ的二个＾１Ａ１态的双值多体项展式（ＤＭＢＥ）势能函数，用Ｅｈｒｅｎｆｅｓｔ模型方法研究了反应（１）Ｏ（＾１Ｄ）＋Ｈ２→ＯＨ和（２）Ｏ（＾１Ｄ）＋Ｈ２→ＯＨ（Ａ＾２∑＾＋）＋Ｈ的非绝热碰撞动力学过程。讨论了电子非绝热跃迁对反应（１）的影响及Ｈ２振动能对反应（２）的促进作用。并求得反应（１）的室温速度常数为０．９４４×１０＾－＾１＾０ｃｍ＾３．ｍｏｌｅｃｕｌｅ＾－＾１．ｓ＾－＾１。     

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     

Time－dependentTheoryofRamanScatteringwithPulses－－ApplicationtoContinuumRamanSpectroscopy

Ｔｉｍｅ－ｄｅｐｅｎｄｅｎｔＴｈｅｏｒｙｏｆＲａｍａｎＳｃａｔｔｅｒｉｎｇｗｉｔｈＰｕｌｓｅｓ－－ＡｐｐｌｉｃａｔｉｏｎｔｏＣｏｎｔｉｎｕｕｍＲａｍａｎＳｐｅｃｔｒｏｓｃｏｐｙＳｏｏ－Ｙ．Ｌｅｅ（ＤｅｐａｒｔｍｅｎｔｏｆＣｈｅｍｉｓｔｒｙ，Ｆａｃｕｌ...     

苯并冠醚及苯并硒杂冠醚的振动光谱研究

苯并冠醚及苯并硒杂冠醚的振动光谱研究何莲胡继明叶勇牛菲谷莹红徐汉生（武汉大学分析测试科学系化学系武汉４３００７２）ＶｉｂｒａｔｉｏｎａｌＳｐｅｃｔｒａｏｆＢｅｎｚｏｃｒｏｗｎａｎｄＳｅｌｅｎａｃｒｏｗｎＣｏｍｐｏｕｎｄｓＨｅＬｉａｎ，ＨｕＪｉｍｉｎｇ...     

Analytic Subject Index to Volume BS,(1996 )

ＡｎａｌｙｔｉｃＳｕｂｊｅｃｔＩｎｄｅｘｔｏＶｏｌｕｍｅＢＳ，（１９９６）ＬＡＳＥＲＤＥＶＩＣＥＳＰＵｌｓｅｗｉｄｔｈｃｈａｒａｃｔｅｒｉｓｔｉｃｓｏｆｍｏｄｅ－ｌｏｃｋｅｄＴｉ：ｓａｐｐｈｉｒｅｌａｓｅｒｗｉｔｈｒｉｎｇｃａａｖｉｔｙＫｅｒｒ－ｌｅ...     

Analytic Subject Index to Volume B3, (1994)

Ａｎａｌｙｔｉｃ Ｓｕｂｊｅｃｔ Ｉｎｄｅｘ ｔｏ Ｖｏｌｕｍｅ Ｂ３，（１９９４）ＬＡＳＥＲＤＥＶＩＣＥＳＮｏ．Ｐａｇｅ　Ｖｅｒｔｉｃａｌ－－ｃａｖｉｔｙｓｕｒｆａｃｅ－－ｅｍｉｔｔｉｎｇｌａｓｅｒｓｆａｂｒａｃａｔｅｄｔｗｉｃｅｂｙｉｍｐｌａｎｔ...     

EDTA－钼配合物溶剂依存性的拉曼光谱

ＥＤＴＡ－钼配合物溶剂依存性的拉曼光谱吴立新，杜菲，魏君华，宋瑞芳（吉林大学理论化学研究所，分子光谱与分子结构开放实验室长春１３００２３）ＲａｍａｎＳｐｅｃｔｒｏｓｃｏｐｉｃＳｔｕｄｙｏｆＳｏｌｖｅｎｔＤｅｐｅｎｄｅｎｃｅｏｆＥＤＴＡ－Ｍｏｌｙｂｄｅ...     

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.     

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.     

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.     

Multi-pulse operation of a Kerr-lens mode-locked femtosecond laser

Our experimental results show that the presence of a proper amount of negative group velocity dispersion is essential to multi-pulse operation of a Kerr-lens mode-locked femtosecond laser. We demonstrate that the pulse separations and the number of pulses contained within a cavity round trip are strongly dependent on the initial perturbations. The results allow us to get a better understanding on the influences of the convoluted self-phase modulation and intra-cavity dispersions on the stable multi-pulse oscillation in a Kerr-lens mode-locked femtosecond laser.     

Propagation of Helmholtz-Gauss beams in weak turbulent atmosphere

Based on the Rytov approximation of light propagation in weak turbulent atmosphere,the closed-form expressions of field and average irradiance of each one of the four fundamental families of Helmholtz-Gauss (HzG)beams:cosine-Gauss beams,stationary Mathieu-Gauss beams,stationary parabolic-Gauss beams,and Bessel-Gauss beams,which are propagating in weak turbulent atmosphere,are obtained.The results show that the field and average irradiance can be written as the product of four factors:complex amplitude depending on the z-coordinate only,a Ganssian beam.a factor of complex phase perturbation induced by atmospheric turbulence,and a complex scaled version of the transverse shape of the non-diffracting beam.The effect of weak atmospheric turbulence on irradiance distribution of the HzG beam can be ignored.     

An effective method for reducing speckle noise in digital holography

An effective method for reducing the speckle noise in digital holography is proposed in this paper.Different from the methods based on classical filtering technique,it utilizes the multiple holograms which are generated by rotating the illuminating light continuously.The intensity images reconstructed by a series of holograms generated by rotating the illuminating light possess different speckle patterns.Hence by properly averaging the reconstructed intensity fields,the speckle noises can be reduced greatly.Experimental results show that the proposed method is simple and effective to reduce speckle noise in digital holography.     

Influence of purity of HfO2 on reflectance of ultraviolet multilayer

The impurities in two kinds of HfO2 materials and in their corresponding single layer thin films were determined through glow discharge mass spectrum technology and secondary ion mass spectrometry(SIMS) equipment respectively.It was found that ZrO2 was the main impurity in the two kinds of HfO2 either in the original HfO2 materials or in the electron beam deposited films.In addition,the difference of Zr content in the two kinds of HfO2 single laver films was much laxger than that of the other impurities such as Ti and Fe.which showed that it was just ZrO2 that made the difference between the optical performance of the film products including the two kinds of HfO2.With these two kinds of HfO2 and the same kind of SiO2.we deposited HfO2/SiO2 multilayer reflective coatings at the wavelength of 266 nm.Experimental results showed that the reflectances of these two mirrors were about 99.85% and 99.15% respectively,which agreed well with the designed results what were based on the optical constants obtained from the corresponding single layer thin films.     

Speech enhancement by array crosstalk resistant ANC and spectrum subtraction

Microphone array-based speech enhancement has great importance for speech communications and speech recognition. To reduce the aperture of the microphone array and to increase the effect of the speech enhancement will greatly broaden the application areas of the microphone array. An array crosstalk resistant adaptive noise cancellation method is therefore presented. And then an improved spectral subtraction algorithm is further cascaded to obtain better enhancement results. Theoretic analysis and experiments indicate that the proposed scheme needs only a very small microphone array while it simultaneously achieves a higher SNR improvement. Besides, the proposed scheme can be used in many noisy environments and is easy for real-time implementation.