激光二极管抽运的GaAs被动Q开关Nd：YVO4激光器

利用固体可饱和吸收体砷化镓（GaAs）作为被动调Q元件，实现了激光二极管抽运平－凹腔掺钕钒酸钇（Nd:YVO4）激光调Q运转，详细测量了砷化镓被动调QNd:YVO4激光输出特性，获得脉宽15ns，重复频率470kHz，光束质量M^2=1.31的激光输出，调Q激光运转阈值为500mW，并数值求解了砷化镓被动调Q速率方程，讨论了被动调Q机理以及调Q脉冲宽度和脉冲重复频率对抽运速率的依赖关系，理论计算结果与实验结果相一致。     

Relativistic Multichannel Theory：Theoretical Study of C^＋ Autoionization States

Based on relativistic multichannel theory,the autoionization states of C are studied.We calculate all the autoionization states in the energy region of 193900-231700cm^-1,and the results are in good agreement with the experimental data.The energy structure we obtain will be important in the dielectronic recombination processes,which plays a key role in determining the abundance of carbon in a nebula.     

Fabrication of Single Crystalline silicon on Glass by Smart—Cut Technique

Single crystalline silicon films are transferred on to a glass substrate by the smart-cut technique,which is based on H^ ions implantation,anodic bonding and layer transfer,Structures of the resulting thin film silicon on galss(SOG) are characterized by transmission-electron microscopy,scanning electron microscopy and Raman spectroscopy.The results show that SOG substrates fabricated by the smart-cut have advantages of steep top Si/glass interface and good monocrystalline Si quality.The Hall-effect measurement indicates that the single crystalline SOG substrates have a better electrical property compared with polycrystalline silicon SOG substrates.     

Electronic Structures of the Filled Tetrahedral Semiconductor LiMgN with a Zincblende—Type Structure

An ab initio method with mixed-basis norm-conserving non-local pseudo-potentials has been employed to investigate the electronic structures of LiMgN.The band structure ,electronic density of states and charge density contour plot of LiMgN are also presented.By the calculation,we have found that LiMgN with a zincblende-type structure was an indirect gap semiconductor,and the value of indirect(Γ-X) energy band gap under the local density approximation was 2.97eV.In addition,the strong covalent charcter for Li-N and Mg-N has also been found in LiMgN.     

Fluorescence Microscopy of Nanoscale Silver Oxide Thin Films

The experimental conditions for photoactivated intermittent fluorescence from nanoscale silver oxide were studied with fluorescence microscopy.Strong fluorescence was observed from the Ag2O particles with size of 10-20nm excited with both blue and green light .We observed the saturation of Photoexcitation with blue light and explained the experimental results using the model of agglomeration of silver atoms to form small clusters and the fluorescence of Ag2 and Ag3 clusters.     

Photoeletricity Capability of Imager Detector with Coated Blends of Polymer and Perylene or Coronene

Perylene and coronene have been synthesized with good yield via the Dields-Alder reaction.They have good photoluminescence properties and could transfer ultraviolet light to visible-loght.To find an easy way of making a better ultraviolet charge coupled device,we blended perylene or coronene with polymers.Then,these blends were analysed by the photoluminescence spectrum.The results indicate that the blends have larger fluorescence intensity than pure perylene or coronene.Through spreading these blends on image detectors,organic image detectors with good ultraviolet photoelectricity capability were prepared.     

Monte Carlo Simulation of Growth of Thin Film Prepared by Pulsed Laser

We use the Monte Carlo simulation method to perform the early growth stage of thin film prepared by pulsed laser deposition.We focus on the number of point defects on the substrate surface varying with the energy density of laser and substrate temperature.The results shows that the laser energy and the substrate temperature strongly affect the morphology and size of the growth islands and the deposition rate of thin film,Our results are in good agreement with the related experimental results.     

基于微观IBM对电子—核散射及核电磁性质的研究——（Ⅰ）BE理论方案

从价核子自由度出发构造出核跃迁电荷／电流密度算符,采用Dyson玻色子展开技术给出了获取核玻色子形式跃迁电荷／电流密度有效算符的一种微观方法（BE方法）。利用微观相互作用玻色子模型（IBM）提供的波函数可在玻色子态空间中求出核跃迁电荷／电流密度,结合电子－核散射以及核电磁跃迁的形式理论,建立了可研究电子－核散射各种形状因子,微分散射截面以及核约化跃迁几率、电磁多极矩、核态g因子等物理量的理论方案,在一种微观sdIBM-2框架下,结合现有理论方案,初步计算^192Os核的能谱、ES跃迁皮色子结构函数（BSF）以及21^＋态到01^＋态的跃迁电荷密度(TCD）,理论结果能够对上述物理量作出较合理的描述。     

高激发态钠原了与分子碰撞能量转移及分子扩散带辐射的增强效应研究

在钠原子－分子混合体系中,实验研究了加入缓冲气体对高位态原子－分子碰撞能量转移和分子扩散带辐射的增强效应;运用瞬态碰撞模型作了理论计算,理论结果与实验结果相符合。     

High—Dimensional Integrable Models with Infinitely Dimensional Virasoro—Type Symmetry Algebra

Using every realization of the Virasoro-type symmetry algebra[σ(f1),σ(f2)]=σ(f1f2-f2f1),we can obtain various high-dimensional integrable models under the meaning that they possess infinitely many symmetries,By means of a concrete realization ,many(3 1)-dimensional equations which possess Kac-Moody-Virasoro-type infinite dimensional symmetry algebras are obtained.