HF的电子态X^1Σ^＋和B^1Σ^＋之势能函数和△ν=2泛频跃迁…

用Ｍｕｒｒｅｌｌ－Ｓｏｒｂｉｅ函数表述ＨＦ（Ｘ＾１Σ＾＋和Ｂ＾１Σ＾＋）的势能函数。通过对ＨＦ振转能级的计算，得到△ν＝２泛频跃迁精细结构，所得结果中，基态之Ｐ支与Ｗ．Ｑ．Ｊｅｆｆｅｒｓ发表的实验结果进行了比较。     

He—HF体系的结构和分析势能函数

利用Ｇｕａｓｓｉａｎ９４程序和ＱＣＩＳＤ／６－３１１＋＋Ｇ方法得到Ｈｅ－ＨＦ和Ｈｅ－ＦＨ两种线性平衡结构,计算出了这两种弱结合分子的结构参数、离解能和二阶力常数。在此基础上,利用多体项展式方法民出Ｈｅ－ＨＦ（Ｘ＾１Σ＾＋）体系的分析势能函数,得到的势能面准确地再现了Ｈｅ－ＨＦ和Ｈｅ－ＦＨ两种线性结构。     

低温宽带NaCl（OH^—）：（F^＋2）H色心激光的实验研究

在ＮａＣｌ晶体中掺入ＯＨ＾－离子可以有效地提高Ｆ＾＋２心的稳定性。采用四镜折迭Ｘ型像散补偿腔，获得了峰值波长１．５７μｍ、输出功率＞２５０ｍＷ的低温宽带ＮａＣｌ（ＯＨ＾－）：（Ｆ＾＋２）Ｈ色心激光。本文着重讨论ＯＨ＾－对Ｆ＾＋２心的稳定作用和影响色心激光振荡的各种因素。     

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。     

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     

NaCl（OH^—）中K^＋对F^＋2型心的形成及其光谱性质的影响

研究了Ｋ＾＋对ＮａＣｌ（ＯＨ＾－）中（Ｆ＾＋２）Ｈ心的形成及其光谱性质的影响。结果表明，Ｋ＾＋的存在抑制了Ｆ＾＋２型心的形成，发迹了（Ｆ＾＋２）Ｈ心的光谱性质，拓宽了发射谱的半功率谱宽。     

用离子阱经H2++H2碰撞反应碰撞反应制备H4+

用Ｐｅｎｎｉｎｇ型离子阱经碰撞反应Ｈ２＾＋＋Ｈ２→Ｈ４＾＋产生稳定的Ｈ４＾＋,主要的反应产物是Ｈ３＾＋,但十分明显地观测到Ｈ４＾＋信号。Ｈ４＾＋在阱中稳定存在时间长达０．１ｓ量级,远比Ｋｉｒｃｈｎｅｒ等人测量的１０＾－６ｓ量级长,最后讨论了生成Ｈ４＾＋的反应过程机制。     

氟锆酸盐玻璃中Tm^3＋离子的红外光谱性质

根据Ｔｍ＾３＋离子有吸收光谱，计算在氟锆酸盐玻璃中的＾Ｔｍ＾３＋的Ｊｕｄｄ－Ｏｆｅｌｔ参数和工外跃迁＾３Ｆｉ→＾３Ｈ４，＾３Ｈ４→＾３Ｈ６和３Ｆ４→＾３Ｈ５ 发跃迁几率，研究了Ｔｍ＾３＋的红外发射光谱的交叉驰豫过程，讨论了离子浓度对红外发光强度的影响，并讨论了这些跃迁的发射截面。     

NaF：OH^—晶体色心及其在氮分子激光照射下的光谱特性

对ＮａＦ晶体和ＮａＦ：ＯＨ＾－晶体在电子束辐照前后及在氮分子激光作用下的红外和紫外光谱进行了研究。认为激光强度能否使ＯＨ＾－分解，决定着Ｆ＾＋２心的再生或退电离。     

10Neq+(q=1～3)的电荷损失截面

采用托马斯－费米近似和二体碰撞近似,计算了多电荷离子１０Ｎｅ＾ｑ＋与中性原子Ｈ和Ｈｅ碰撞的电荷损失截面以及电子的动量分布和离子势函数分布。     

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.     

Hybrid Wavelength and Code Division Multiple Access in Optical Networks

A review of schemes for multiple access in fiber optic networks shows that a hybrid of wavelength and code division multiple access (WCDMA) combines the best features of both. In particular, the hybrid scheme retains the large information carrying capacity of wavelength division multiple access (WDMA) and flexibility of code division multiple access (CDMA). In this paper WDMA, optical CDMA (OCDMA), and WCDMA networks are discussed. In OCDMA networks, concept of incoherent and coherent coding including inverse decoding and matched filter is introduced. The delay performance of both WDMA and WCDMA networks, under the simple suboptimum access protocols based on cyclic search, is computed. It has been shown quantitatively that tuning delay significantly affects the delay performance of both WDMA and WCDMA networks. Futhermore, delay performance of WCDMA networks is always better than the WDMA networks for the same tuning delay, load, and number of users.     

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.     

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.     

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.     

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.     

Influences of SiO2 protective layers and annealing on the laser-induced damage threshold of Ta2O5 films

Ta2O5 films are prepared on BK7 substrates with conventional electron beam evaporation deposition.The effects of SiO2 protective layers and annealing on the laser-induced damage threshold (LIDT) of the films are investigated.The results show that SiO2 protective layers exert little influence on the electric field intensity(EFI)distribution,microstructure and microdefect density but increase the absorption slightly.Annealing iS effective on decreasing the microdefect density and the absorption of the films.Both SiO2 protective layers and annealing are beneficial to the damage resistance of the films and the latter is more effective to improve the LIDT.Moreover,the maximal LIDT of Ta2O5 films is achieved by the combination of SiO2 protective layers and annealing.