Na＋I2→Na^＋＋I^—2离子对生成反应几率的LCAC—SW量子散射计算

将ＬＣＡＣ－ＳＷ方法推广到离子对生成反应的动力学研究,导出了计算态－态反应几率的理论公式,并在Ａｔｅｎ－Ｌａｎｔｉｎ－Ｌｏｓ两态势能面上计算得到了Ｎａ＋Ｉ２→Ｎａ＾＋＋Ｉ＾－２电离反应的共线选态反应几率,结果表明反应几率随碰撞能增加呈振荡变化,该反应阈能约为２．８ｅＶ,与实验值相近。     

P—He碰撞中1s—ns电子俘获截面计算

本文进一步发展了由我们提出的一种新的方法来计算离子－原子，离子－离子碰撞中１ｓ－ｎｓ电子俘获截面。在该方法中，我们用联合原子模型描述初态电子的导曲波函数及用氢原子模型的描述末态电子的波函数，在小几率及峰点近似条件下，其散射振幅为一简单的解析形式。在１０－２００ｋｅＶ能量范围，我们用此方法计算了Ｐ＋Ｈｅ碰撞中电子俘获到４ｓ态的截面。计算结果与实验结果在３０－２００ｋｅＶ能量很好地一致。特别是我们的结     

54Xe^q＋（q=1,2）与H和He碰撞的电荷剥离截面

采用二体碰撞近似和托马斯－费米近似方法计算了多电荷离子５４Ｘｅｑ＋ （ｑ ＝ １,２ ）与中性原子Ｈ和Ｈｅ 碰撞的电荷剥离截面、电子动量分布和离子势函数分布。计算结果与平面波玻恩近似结果符合得较好     

7.5—30keVC^＋,N^＋,O^＋与H2分子碰撞的单电子俘获截面测量

建立了一套用于研究单价正离子与气体分子碰撞的单电子俘获过程的装置，测量了７．５－３０ｋｅＶ能量范围的Ｃ＋、Ｎ＋、Ｏ＋离子与Ｈ２分子碰撞单电子俘获截面。对于３０ｋｅＶ能量点，我们的实验结果和文献推荐值符合较好，其它能量点尚未见报道     

类锂离子O%5＋的电子碰撞电离

此文采用扭曲库仑波函数描述碰撞电子，用Ｒ─矩阵密耦波函数处理被电离电子与剩余离子构成的系统初末态，在库仑玻恩各级近似下计算了类锂离子Ｏ５＋的电子碰撞电离截面及相应速率系数，这是文献中首次使用密耦方法，在考虑通道相互作用情形下得到的结果。     

H＋F弹性碰撞微分截面的计算

采用经典力学的方法对Ｈ与Ｆ碰撞动力学问题进行了研究,计算了碰撞的轨迹,偏转函数和微分截面。ＨＦ（Ｘ＾１Σ＾＋）的势能函数采用Ｍｕｒｒｅｌ－Ｓｏｒｂｉｅ函数形式。     

类硼离子N^2＋的电子碰撞电离—单通道截面的共振增加

使用Ｒ－矩阵方法，在库仑－玻恩非交换近似下（ＤＣＢＮＸ）采用三态密耦图象，计算了类硼离子Ｎ２＋的电子碰撞电离截面，并给出了总的能量微分截面及分波能量微分截面。计算结果揭示了明显的Ｒｙｄｂｅｒｇ系列共振，并指出共振对截面的贡献大于直接电离过程对截面的贡献，这与Ｃｈｉｄｉｃｈｉｍｏ的结论一致。     

原子轨道方法研究He^2＋-He碰撞中电荷转移过程

应用双中心的原子轨道强耦合方法研究了He^2＋-He碰撞中的电荷转移过程，计算了随入射离子能量变化的单电子俘获总截面及各个次壳层的态选择截面，并与其它理论结果和实验结果进行了比较，发现我们的理论结果与实验很好的符合．针对中国科学院近代物理研究所最近的实验测量，我们也计算了电荷转移过程的微分截面．     

原子和离子间激光感生碰撞电荷交换的微扰理论

将激光感生碰撞电荷看作一个四体系统，发展了激光感生碰撞电荷电荷的微扰理论，以独立原子和离子的复合态波函数作为激光感生碰撞体系的基组函数，得到了体系态振幅的运动方程。利用激光感生碰撞电荷交换的微扰理论，对Ｃａ＾＋－Ｓｒ间激光感生碰撞电荷交换进行了数值计算，并与Ｇｒｅｅｎ等人的实验结果进行了比较。     

高能p－A碰撞中领头粒子快度分布的几何效应和碎裂效应

基于相互作用胶子模型，采用更严格的高能ｐ－Ａ过程的几何学，并考虑到Ｎ－Ｎ过程中末态的碎裂效应，计算了１００ＧｅＶｐ＋Ａｇ碰撞中末态领头粒子的快度分布，并跟实验数据作了比较，计算结果能很好地符合实验数据．     

1—(4—吡啶甲酰)—4—芳基氨基硫脲类和3—(4—吡啶基)—4—芳基—1,2,4—三唑啉—5—硫酮类化合物~(13)C—NMR谱研究

本文测定了新合成的,具有生理活性的1-(4-吡啶甲酰)-4 -苯基氨基硫脲,1-(4-吡啶甲酰)-4-对氯苯基氨基硫脲,1-(4 -吡啶甲酰)-4-对溴苯基氨基硫脲3-(4-吡啶基)-4-苯基-1,2,4,-三唑啉-5-硫酮,3-(4-吡啶基)-4-对氯苯基-1,2,4,-三唑啉-5-硫酮,3-(4-吡啶基)-4-对溴苯基-1,2,4-三唑啉-5-硫酮六个新化合物的~(13)C-NMR谱,并通过~(13)C-NMR谱中的宽带去偶,偏共振及APT技术,模型化合物对照,讯号强度对比及芳基取代基常数计算等方法,进行了上述化合物~(13)C-NMR谱峰的归属,并得到了甲酰肼基在吡啶环4位取代后对吡啶环各碳所产生的取代基效应.     

A Quantum Monte Carlo Study on Mixed-Spin Chains of 1/2-1/2-1-1 and 3/2-3/2 -1-1

The ground-state and thermodynamic properties of quantum mixed-spin chains of1/2-1/2-1-1and 3/2-3/2-1-1are investigated by a quantum Monte Carlo simulation with the loop-cluster algorithm. For 1/2-1/2-1-1 chain, we find it has two phases separated by an energy-gap vanishing point in the ground-state. For 3/2-3/2-1-1 chain, the numerical results show two energy-gap vanishing points isolated by different phases in its ground-state. Our calculations indicate that all these ground state phases can be understood by means of valence-bond-solid picture, and the thermodynamic behavior at finite temperatures is continuous as a function of parameterα=J2/J1.     

A Quantum Monte Carlo Study on Mixed-Spin Chains of 1／2-1／2-1-1 and 3／2-3／2-1-1

The ground-state and thermodynamic properties of quantum mixed-spin chains of 1/2-1/2-1-1 and 3/2-3/2-1-1 are investigated by a quantum Monte Carlo simulation with the loop-cluster algorithm. For 1/2-1/2-1-1 chain, we find it hastwo phases separated by an energy-gap vanishing point in the ground-state. For 3/2-3/2-1-1 chain,the numerical results show two energy-gap vanishing points isolated by different phases in its ground-state. Our calculations indicate that all these ground state phases can be understood by means of valence-bond-solid picture, and the thermodynamic behavior at finite temperatures is continuous as a function of parameter α=J2/J1.     

Observation of B(+/-) --> p(-)pK(+/-)

We report the observation of the decay mode B(+/-) --> p(-)pK(+/-)based on an analysis of 29.4 fb(-1) of data collected by the Belle detector at KEKB. This is the first example of a b-->s transition with baryons in the final state. The p(-)p mass spectrum in this decay is inconsistent with phase space and is peaked at low mass. The branching fraction for this decay is measured to be B(B+/--->p(-)pK+/-) = [4.3(+1.1)(-0.9)(stat)+/-0.5(syst)]x 10(-6). We also report upper limits for the decays B(0)-->p(-)pK(S) and B(+/-)-->p(-)p pi(+/-).     

Observation and polarization measurements of B+/- -->phiK1 +/- and B +/- -->phiK2 *+/-

With the full BABAR data sample of 465 x 10(6) B(over)B pairs, we observe the decays B+/- -->phiK_(1)(1270) +/- and B +/- -->phiK*_(2)(1430)+/-. We measure the branching fractions (6.1+/-1.6+/-1.1) x 10(-6) and (8.4+/-1.8+/-1.0) x 10(-6) and the fractions of longitudinal polarization 0.46 (+0.12+0.06) _(-0.13-0.07) and 0.80(+0.09)_(-0.10)+/-0.03, respectively. We also report on the B+/- -->phiK*_(0)(1430)+/- decay branching fraction of (7.0+/-1.3+/-0.9) x 10(-6) and several parameters sensitive to CP violation and interference in the above three decays. Upper limits are placed on the B+/- decay rates to final states with phi and K_1(1400)+/-, K*(1410)+/-, K2(1770)+/-, or K_2(1820)+/-. Understanding the observed polarization pattern requires amplitude contributions from an uncertain source.     

X波段宽带极低噪声低温放大器

介绍了8～9GHz极低噪声低温放大器的研制。在≤15K的工作温度下,实测放大器的主要性能指标如下:等效噪声温度≤7.9K;增益>31dB,带内起伏≤1dB;输入反射损耗<-21dB;输出反射损耗<-23dB。它的研制成功,实现了深空探测、天文观测等X波段宽带低温接收机的核心器件国产化。     

Unification of 3-3-1 models

A 3-3-1 model is constructed for three families that can be embedded into a single SU(8) unified model. Assuming appropriate branching rules and symmetry-breaking pattern, a complete fermion content is found within irreducible representations of SU(8), where light Standard Model fermions, heavy 3-3-1 fermions and superheavy fermions may be distinguished.     

Observation of B+/- -->omegaK+/- decay

We report the first observation of the charmless two-body mode B+/--->omegaK+/- decay, and a new measurement of the branching fraction for the B+/--->omegapi(+/-) decay. The measured branching fractions are B(B+/--->omegaK+/-)=(9.2(+2.6)(-2.3)+/-1.0)x10(-6) and B(B+/--->omegapi(+/-))=(4.2(+2.0)(-1.8)+/-0.5)x10(-6). We also measure the partial rate asymmetry of B+/--->omegaK+/- decays and obtain A(CP)=-0.21+/-0.28+/-0.03. The results are based on a data sample of 29.4 fb(-1) collected on the Upsilon(4S) resonance by the Belle detector at the KEKB e(+)e(-) collider.     

Mössbauer study of tin-doped 1-2-3 and 2-1-4 highT c superconductors

Samples of YBa₂(Cu_0.85Sn_0.15)₃O_7–y (1-2-3), La₂(Cu_0.95Sn_0.05)O4_4–x, and La_1.85Ba_0.15(Cu_0.95Sn_0.05)O_4–x (2-1-4), with different oxygen stoichiometry, have been studied by Mössbauer spectroscopy. These measurements reveal the existence of two inequivalent sites for Sn in the (1-2-3) compounds. The (1-2-3) spectra display two quadrupole doublets which we associate with Sn in Cu(1) and Cu(2) sites, respectively. La compounds show a single quadrupole doublet.     

Quantum Chemical Calculations on 4-[2-(Tert-Butylamino)-1-Hydroxyethyl]-2-(Hydroxymethyl)Phenol by Density Functional Theory

Density functional theory (DFT) calculations have been carried out for the compound 4-[2-(tert-butylamino)-1-hydroxyethyl]-2-hydroxymethyl) phenol (4BAHEHMP) by using the B3LYP method at the 6-311++G (d,p) basis set level. The electric dipole moment (μ) and the first hyperpolarizability (α) values of the investigated molecule were computed. Total and partial density of state (TDOS and PDOS) and also overlap population density of state (COOP or OPDOS) diagrams analysis were presented. HOMO and LUMO energies confirm that charge transfer occurs within the molecule. In addition Molecular Electrostatic Potential (MEP), Natural Bond Orbital analysis (NBO) and Non- Linear Optical (NLO) properties are studied.