U^＋＋的能级与UO^＋＋2的电子状态

用全相对论量子力学方法计算了电子组态为［Ｒｎ］５ｆ２６ｄ１７ｓ１的Ｕ的全部２１４个电子状态的能级，基态为５Ｋ５。设ＵＯ２为线型（Ｒ∞ｈ），Ｕ和Ｏ２均为基态，则ＵＯ２的可能电子状态有３，５，７Σ－ｇ，３，５，７πｇ，…。ＵＯ２的基态不大可能为１Σ＋ｇ。     

N2分子X^1Σg^＋,A^3Σu^＋和B^3Пg的势能函数

用文献［１，２，８］介绍的方法推导了Ｎ２分子的基态（Ｘ＾１Σｇ＾＋）的激发态（Ａ＾３Σｕ＾＋和Ｂ＾３Пｇ）的合理离解极限。计算并比较了在６－３１１Ｇ＾＊基集合，ＵＨＦ、ＣＩＤ、ＵＣＩＳＤ和ＱＣＩＳＤ水平下Ｎ２分子上述三个电子态的平衡结构和谐振频率；并用ＱＣＩＳＤ／６－３１１Ｇ＾＊计算了各态的系列单点势能值，由正规方程组拟合Ｍｕｒｒｅｌｌ－Ｓｏｒｂｉｅ函数得到了相应各态的完整势能函数，结果与实验数计     

类锗离子Ru^1^2^＋到Cd^1^^^＋4s^24p^2,4s4p^3,4s^24p5s组…

用ＭＣＨＦＲ自洽场方法，结合自行设计的最小二乘拟合程序，计算了与软Ｘ射线激光研究有关的类锗离子Ｒｕ＾１＾２＾＋到Ｃｄ＾１＾６＾＋的４ｓ＾２４ｐ＾２，４ｓ４ｐ＾３，４ｓ＾２４ｐ５ｓ组态能级，波长和振子强度。计算结果与实验进行了比较。     

类钡离子Y^8＋b到U^30＋5s^2^1S0—5s5p^1,3PJ振子强度计算

应用屏蔽氢模型计算了Ｙ＾８＋ｂ到Ｕ＾３０＋５ｓ＾２＾１Ｓ０－５ｓ５ｐ＾１Ｐ１振子强度ｆｉｆ，借助混合角，导出５ｓ＾２＾１Ｓ０－５ｓ５ｐ＾３Ｐ１组合跃迁振子强度ｆｉｆ与ｆｉｆ关系，计算结果与ＭＣＤＦ－ＯＬ法相吻合。     

C2分子的分析势能函数与垂直电离势

用ａｂｉｎｉｔｉｏ计算方法和实验光谱数据分别导出Ｃ２分子基态Ｘ１Σ＋ｇ和激发态ｄ３Πｇ的Ｍｕｒｅｌ－Ｓｏｒｂｉｅ函数，同时用ＱＣＩＳＤ／６－３１１Ｇ方法优化出Ｃ－２、Ｃ＋２、Ｃ２＋２分子离子基态的平衡核间距，算出Ｃ２分子的垂直电离势，计算数据与实验光谱数据进行了比较。     

UO2体系的分子动力学研究

基于多体展式方法所导出的ＵＯ２（Ｚ＾３Σu＾＋）分析势能函数,用准经典的Ｍｏｎｔ ｅ－Ｃａｒｌｏ轨迹法研究了Ｏ（Ｘ＾３Ｐｇ）＋ＵＯ（０,０）的原子与分子反应动力学过程。研究结果表明：Ｏ（Ｘ＾３Ｐｇ）与ＵＯ（０,０）碰境生成稳定络合物ＵＯ２（Ｘ＾３Σｕ＾＋）,该反应是无阈能反应;而Ｕ（Ｘ＾５Lu）与Ｏ２（０,０）碰撞不能生成稳定络合物,主要发生交换反应：Ｕ（Ｘ＾５Ｌu）＋Ｏ２（０,０）→ＵＯ（Ｖ＾１,Ｊ     

中高能电子和N2（^1Σ^＋g）,CO（^1Σ^＋）弹性散射全截面的计算

此文采用由原子轨道线性组合构成的自洽场分子轨道，用一级玻恩近似计算了能量为１００－５０００ｅＶ的电子与Ｎ２（＾１Σ＾＋ｇ、ＣＯ（＾１Σ＾＋）弹性散射的微分截面和全截面。由于采用Ｇａｕｓｓ函数的线性组合拟合Ｓｌａｔｅｒ函数的方法，得到了弹性散射微分截面的解析表达式，使计算大大简化，计算得到的电子和Ｎ２，ＣＯ散射的总截面和实验结果进行了比较，当入射电子的能量大于１ｋｅＶ时，理论值和实验值之间符合得很好     

He（2^3S）与N2O（X）Penning电离中的N2O^＋（A^2Σ^＋）生成速率及相…

在分子束条件下测量了Ｈｅ（２＾３Ｓ）＋Ｎ２Ｏ（Ｘ）→Ｎ２Ｏ＾＋（Ａ＾２Σ＾＋）＋Ｈｅ（＾１Ｓｏ）＋ｅ＾－反应的Ｐｅｎｎｉｎｇ电离光学光谱，求得了Ｎ２Ｏ＾＋（Ａ＾２Σ＾＋）态的初生态相对振动布居。以Ｈｅ（２＾３Ｓ）＋Ｎ２（Ｘ）→Ｎ＾＋２（Ｂ＾２Σ＾＋ｕ）＋Ｈｅ（＾１Ｓｏ）＋ｅ＾－为参考反应，测量了Ｈｅ（２＾３Ｓ）＋ＢＮ２Ｏ＾＋（Ａ＾２Σ＾＋）＋Ｈｅ（＾１Ｓｏ）＋ｅ＾－反应的速率常数ＫＮ２Ｏ＾＋（Ａ）     

PuO2体系的分子反应动力学研究

基于ＰｕＯ２分子（Ｘ＾５Σｇ＾＋）的多体展式分析势能函数,用准经典的Ｍｏｎｔｅ－Ｃａｒｌｏ轨迹法研究了Ｏ（＾３Ｐｇ）＋ＰｕＯ（０,０）和Ｐｕ（＾７Ｆｇ）＋Ｏ２（０,０）的分子反应动力学过程。结果表明：Ｏ（＾３Ｐｇ）＋ＰｕＯ（０,０）碰撞生成少量稳定络合物ＰｕＯ２（Ｘ＾５Σｇ＾＋）,该反应是无阈能反应;而Ｐｕ（＾７Ｆｇ）＋Ｏ２（０,０）碰撞生成稳定络合物的同时,主要还发生了Ｐｕ（＾７Ｆｇ）＋Ｏ２（０     

类铍Ar^14＋和类镁Ar^6＋离子双激发态能级的计算

用相态相互作用方法计算了类铍Ａｒ＾１４＋离子双激发态１ｓ＾２３ｌ３ｌ＇和类镁Ａｒ＾６＋离子双激发态１ｓ＾２２ｓ＾２２ｐ＾６４ｌ４ｌ＇的能级。两个外层电子与内层原子实１ｓ＾２或１ｓ＾２２ｓ＾２２ｐ＾６电子的作用用模型势表不。Ａｒ＾１４＋的双激发态可用量子数Ｋ，Ｔ和Ａ标记，而Ａｒ＾６＋的某些组态却不能用上述量子数表示。     

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.     

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.