THE VERTICAL DIFFERENTIAL MOMENTUM SPECTRUM OF THE MUON AT 3200M ABOVE SEA-LEVEL

The vertical differential momentum spectrum and the charge ratio of the cosmic ray muon, in the range(0.4—250GeV/c), has been measured by means of the magnetic spectrometer and the range-spectrometer in Yunnan station at 3200 m above the sea level. The present spectrum is in agreement with the differential spectrum of muons, measured by others at the same mountain altitude. In the 15—250GeV/c momentum range, the spectrum obtained from the present experiment is also in good agreement with the differential spectrum of the muon which has been determined by O.C. Allkofer et al. at the sea level. The charge ratio of the muon is almost constant in the range (5—100GeV/c). The average value is 1.30±0.06.     

THE NEGATIVE-POSITIVE RATIO OF CHARGED COSMIC RAY HADRONS AT THE 3220 m ABOVE SEA-LEVEL

Single tracks of unaccompanÏed charged hadrons, within a horigontal area of 0.23m² have been measured with a magnetic spectrometer, a pre-selector of momentum in combination with a multiplate cloud chamber in a laboratory at 3220m above sea level. Taking various possible corrections into account, the negative-positive ratio of charged hadrons was obtained as N^-/N⁺=0.53±0.05 in the momentum range of 10-20 GeV/c. If we considered N⁺ contained only P and π⁺, N^-were π^-and that N_π+/N_π-=1, we deduced the result N_π-/N_p=0.9±0.1. Taking the form of the π^-integral spectrum as j（>p）=Kp^-γ, it was estimated that γ（?）2.3 in the momentum range 5—20 GeV/c. In this paper the integral verticel flux intensity of all charged hadrons was also estimated roughly, the result is:j_⊥^p+π（>12 GeV/c）=（7.4±0.7）×10^-5/cm²·sг·s_^.     

HIGH-PRESSURE SYNTHESIS OF MgB2 SUPER-CONDUCTOR WITH Tc ABOVE 39 K

We report on the high-pressure synthesis and superconductivity of MgB₂ intermetallic compounds. The compounds have been obtained through high-pressure sintering of the mixtures of magnesium and boron fine powders under 5.0 GPa and at ～1000℃ for 30 min. Magnetic measurements using a SQUID magnetometer show the sharp bulk superconducting transition above 39 K; the four-probe dc resistivity measurements indicate the highly-conductive normal state and sharp superconducting transition. The results highlight that high-pressure synthesis would be a promising way to promote the studies of this new kind of intermetallic superconductors.     

集成透镜InGaAsP/InP DH LED特性研究

本文设计与制作了集成球透镜1.3μm InGaAsP/InP DH LED,并对集成透镜LED的频响特性,光强远场分布以及与光纤的耦合特性等方面进行了测试分析.研究结果表明,球透镜LED与标准光纤的耦合效率较之乎面型LED有显著提高,达7.5%,器件截止频率也比平面型LED提高的20%,最高截止带宽达425MHz.     

钆镓石榴石单晶的喇曼光谱

测量了助熔剂法和提拉法生长的钆镓石榴石单晶的喇曼光谱。识别了该晶体的喇曼活性声子。和文献[6]相比,本文得到了更完全的结果。我们也比较了两种方法生长的晶体的喇曼谱,声子模式彼此一致。发现一些不同的谱线,这被识别为不同稀土掺杂离子的荧光谱线。 关键词：     

YAlO3:Nd3+的吸收光谱

从0.33—5.7μm的波长范围内系统地测定了温度为10K、90K和30OK时YAlO₃:Nd³⁺的吸收光谱,定出Nd³⁺在晶体场作用下的斯塔克(Stark)子能级。并在10K到663K的温度范围内,观察了部分光谱线的温度效应,得到一些有意义的结果。 关键词：     

LiYF4晶体中Er3+的偏振吸收光谱及其量子态

本文系统地研究了LiYFLiYF₄晶体中Er³⁺在可见光谱及紫外光谱区的吸收光谱及其偏振。主要定出了其较高能级的斯塔克子能阶的波数值以及其不可约表示。发现其线群与LaFLiYF₃及CaWOLiYF₄中Er³⁺的吸收光谱线群大致是一一对应的,但三种晶体中能级重心有系统的移位。 关键词：     

SiH4紫外多光子电离光谱的转动分析

本工作用激光扫描步长6×10^-4nm观测了SiH₄多光子电离光谱中363.52nm附近的精细结构。SiH₄被三光子共振激发后,作为略不对称陀螺处理。大多数转动谱线被论证为v₂振动垂直谱带的一个Q支,并推算出激发态转动常数B＇=3.04±0.01cm^-1。 关键词：     

B的KαX射线谱精细结构的研究

应用高分辨软X射线弯晶谱仪并结合傅里叶自重卷积解谱技术研究B的K_αX射线谱的精细结构。在解谱过程中采用一种新的动态变迹函数,既能区分叠加的谱峰,提高谱线分辨率,又能保持良好的信噪比。应用这种方法处理B₂O₃中B的K_αX射线谱,从包络线中区分出波长67.657和67.536?的两条谱线,获得该谱线具有精细结构的证据,验证了关于B的sp²轨道杂化理论。 关键词：     

PREPARATION, SUPERCONDUCTIVITY AND STRUCTURE OF THE LaBaCaCu3O7-x SUPERCONDUCTORS WITH Tc HIGHER THAN 80 K

In this paper, the preparation process of the tetragonal LaBaCaCu₃O_7-x (LBCCO) superconductor with T_c=84 K is repored. The superconductivity and structure of the LBCCO superconducting phase are investigated by means of X-ray diffraction (XRD), transmission electron microscope(TEM) and superconductivity measurements, The results indicate that the superconducting phase with T_c=82K in the LBCCO system has a tetragonal structure with a=0.3966nm, c=l.1838nm and space group P4/mmm. About 50% of the Ca and La atoms are located in 1d sites (i.e. Y site in the YBCO structure). It is confirmed that there is in fact no orthorhombic to tetragonal transition in this material. The relationship between the oxygen content and T_c is also presented.     

三甲撑三硝基胺中N14核四极共振谱的测量

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Li4GeO4-Zn2GeO4赝二元系相图的研究

本文用差热分析和X射线衍射的方法对Li₄GeO₄-Zn₂GeO₄赝二元系相图进行了研究。结果指出,文献中所报道的锂离子导体Li₁₄Zn(GeO₄)₄不是化合物,而是含Zn₂GeO₄的以Li₄GeO₄为基的固溶体,由于Zn₂GeO₄的加入,使Li₄GeO₄的高温相稳定存在于室温。根据研究结果,提出了关于Li₁₄Zn(GeO₄)₄多晶陶瓮样品在室温长期放置后,电导率明显降低的解释。     

C2H221分子转动角动量定向分布(Orientation)及其碰撞弛豫和转移

利用圆偏振激光受激Raman抽运,以 C₂H₂分子为样品选择性地制备了它的电子基态单一转动态(X¹Σ⁺_g,ν″₂＝1,J″的角动量定向布居(orientation)．并从圆偏振紫外激光诱导的A¹A_u(ν′₃＝1)←X¹Σ⁺_g(ν″₂＝1)的荧光（谱）,直接测定了 C₂H₂(X¹Σ^＋_g,ν″₂＝1,J″＝4,7,8,…,13）的角动量定向布居值．从时间分辨的荧光信号谱测定了角动量定向布居的碰撞弛豫速率常数,同时还研究了由各初始激励的转动态向其他邻近转动态碰撞诱导的角动量定向布居转移． 关键词：     

Cd0.96Zn0.04Te低温Raman光谱中荧光背景的猝灭现象

研究了Cd_0.96Zn_0.04Te表面低温Raman散射光谱中的样品荧光背景随激光功率的变化行为,观察到了荧光的“猝灭”现象和同时伴随的声子峰红移.分析表明样品荧光的“猝灭”现象与声子峰红移显示的表面结构变化有关,而激光对Cd_0.96Zn_0.04Te表面的加热是导致表面晶体结构变化的原因. 关键词： 低温Raman光谱 0.96Zn_0.04Te')" href="#">Cd_0.96Zn_0.04Te 荧光背景 猝灭     

硫酸锂钾的高压相及室温以上的P-T状态图

本文用改进了的高压下差热分析方法以及金刚石压砧加温下的X射线衍射方法研究了硫酸锂钾(LiKSO₄)在室温以上的高压相变,较精确地测定了在3GPa、800℃以下各相的平衡条件,作出了它的P-T状态图。本文发现LiKSO₄在1.65GPa以上压力存在一个高压结构,标定了它的晶体参数,测量了它在高压下的热膨胀行为,并研究了高压相在常压时的热稳定性。 关键词：     

ANALYSIS OF THE HDO ABSORPTION SPECTRUM BETWEEN 9600-10200cm-1

The absorption spectrum of HD¹⁶ O was recorded at a resolution of 0.02 cm^-1 with a Bruker IFS 120HR Fourier Transform Spectrometer in the region of 9600-10200 cm^-1. As far as we know it is the first time to record and analyze the HDO spectrum in this region which was assigned as the ν₁+2ν₃ and 2ν₂+2ν₃ bands. With the strong resonance interactions between these two bands considered, the spectroscopic parameters were optimized by the nonlinear least squares method.     

AlI原子2D吸收谱的多通道量子数亏损理论分析

本文用多通道量子数亏损理论分析计算了AlI原子的²D吸收谱。采取具有三个不同电离阈的三个分解通道的混合模型。在适当选择了与能量有关的参数μ_α,D_α以及转换矩阵元U_iα之后,计算了第一电离阈和第二电离阈之间的²D自电离谱,并与Roig的测量结果作了比较。利用上述参数延伸到分立能域,得到²D能级的里德伯系列及其振子强度值。其结果与Lin和Weiss的分析以及相关的实验相符。 关键词：     

AgI(Cr2O3)复合离子导体的光谱研究

本文研究了AgI(Cr₂O₃)复合离子导体的红外吸收光谱,近紫外、可见反射光谱。发现复合离子导体的两种谱图均与纯AgI,Cr₂O₃的不同。红外吸收光谱在882—889cm^-1处有一新吸收峰。电子谱中,AgI从430nm开始向长波方向表现的光离解特性消失。本来Cr₂O₃由配位场效应而引起的d—d吸收跃迁以410nm,530nm为中心的反射谱带,现在410nm处的谱带消失。530nm处的谱带稍有红移,且随加入Cr₂O₃量的增多而强度减弱。代之以整个紫外、可见区的较强吸收。对此,结合透射电子显微镜的分析,用双声子耦合和介质的变形极化以及配位场理论对AgI(Cr₂O₃)复合离子导体的声子谱和电子谱进行了解析。 关键词：     

超声射流冷却CCl2自由基的激光诱导荧光激发谱

在497—517nm波长范围观测超声射流冷却CCl₂自由基的激光诱导荧光激发谱。得到CCl₂在?←X跃迁中(v₁,v₂,0)←(0,0,0)振动带清晰的K结构。对近80个子谱带作了归属。振动分析给出较精确的v＇₁和v＇₂振动频率和非谐性常数;从K结构的分析得出(A＇-B＇)和(A″-B″)的值,文献未曾报道过。 关键词：     

室温下KLiSO4晶体的中子衍射结构分析

用中子衍射方法研究了室温下KLiSO₄的晶体结构,进一步确定了Li原子的位置,所得到的结果与近年采用X射线分析的结果在z/c上的差异小于1％。 关键词：