类氢离子的新势函数模型

给出了类氢离子的一个新势函数,该势函数包含了离子电离度效应,求出了相应的离子能级与波函数。用该理论研究了高离化态的类氢氟离子和类氢氖离子的部分激发光谱,计算结果与实验结果吻合很好。     

电离度与类H离子电离能关系的研究

研究了类Ｈ离子电离能与电离度ΔＺ（离子电荷数）之间的关系,给出了类Ｈ离子各电离态电离能的计算公式,并对所有类Ｈ离子的电离能进行了计算。与实验结果或相对论多组态ＤｉｒａｃＦｏｃｋ方法的结果比较,得到了较满意的结果。     

高n双电子复合伴线对类氦镁离子Kα共振线贡献的理论计算

利用多组态Dirac-Fock方法计算了类氦镁离子的双电子复合截面.分析了类锂镁离子高n双电子伴线结构及其对类氦镁离子Kα共振线的影响.结果表明类锂镁离子高n双电子伴线和类氦镁离子Kα共振线之间存在着严重的混合,会导致Kα共振线强度的增加、谱形的加宽以及位置的移动.     

X射线激光的新进展

1985年,美国劳伦斯·利弗莫尔国家实验室曾首次报道了他们观测到类氖Se离子的远紫外谱线的增益.此后,科学家们对类氖离子和类镍离子的能级和受激发射进行了广泛的研究.这两类离子最适用于远紫外与X射线激光器,因为它们有满电子壳层,性能比较稳定.　根据理论推算,类氖离子也能产生短于碳的K吸收边(43.76A)的软X射线波长的辐射,但是要求泵浦功率密度高达 1016 W/cm2,这在目前还难以实现. 1987年11月,利弗莫尔实验室的一个小组报道了他们首次观测到类镍离子产生软X射线的增益,实验结果表明,类镍离子比类氖离子更有希望用于X射线激光器.他们…     

电子碰撞激发机制中自电离与双电子俘获

 以Ge为例，研究了双电子复合代替自电离与双电子俘获对离子布居的影响；通过解包括双激发态和自电离与双电子俘获过程的速率方程组，研究了类F离子与类Ne离子基态对19.6nm与23.6nm激光线上、下能级的布居贡献因子及类Na离子与类Ne离子的电离速率，并讨论了这两条激光线的反转与增益。     

高离化类Ne铕离子的双电子伴线结构的理论研究

在对高离化态类Ne铕离子及其临近的类Na、类Mg离子的n=3→2跃迁的波长和强度详细计算的基础上，考虑了等离子体中单个谱线的展宽和谱线之间的重叠，得到了类Ne铕离子n=3→2的共振线及其类Na和类Mg离子双电子伴线的结构，并系统地分析了这些伴线对共振线波长和强度的影响.     

电离度与类HY了子电离能关系的研究

研究了类Ｈ离子电离能与电离度△Ｚ（离子电荷数）之间的关系，给出了类Ｈ离子各电离态电离能的计算公式，并对所有类Ｈ离子的电离能进行了计算。与实验结果或对论多组态Ｄｉｒａｃ－Ｆｏｃｋ方法的结果比较，得到了较满意的结果。     

某些类氖离子和类镍离子等离子体状态对应关系的研究

利用一维拉格朗日流体动力学程序Med103详细研究了产生类镍Ag,Cd,In,Sn, Sb离子和类氖Fe,Co,Ni,Cu,Zn离子的等离子体状态.通过对电子温度、离子丰度、离子数密度等状态参量的分析比较，得到了这两类等离子体状态之间的对应关系.即类镍银的等离子体状态与类氖铁 的相近，类镍镉的与类氖钴的相近，依次类推.利用这一对应关系可以方便地由类氖机理x射线激光的等离子体状态来对相应元素的类镍x射线激光的等离子体状态进行判断. 关键词： 类氖 类镍 等离子体状态 x射线激光     

类钠铜离子软X射线激光三体复合泵浦机制的研究

 详细研究了类钠铜离子激光等离子体中的各种复合过程，并从理论上描述了类钠铜离子软X射线激光的低温三体复合泵浦机制。     

Au激光等离子体的双电子复合速率系数

基于准相对论多组态HartreeFock理论和扭曲波近似,采用组态平均的方法,从头计算了类铁金离子类镓金离子的双电子复合速率系数,计算中包含了大量稠密的自电离能级,由于宽广的自电离能级分布和极其复杂的级联效应,造成高Z材料Au的双电子复合速率系数不同于低Z元素的特征,与现有文献的类镍金离子比较,结果表明,在“神光Ⅱ”实验装置诊断的电子温度约为2keV,电子密度约为6×1021cm-3,Au激光等离子体不同理论之间的双电子复合速率系数误差不到10%.这对于使用超组态碰撞辐射模型模拟Au的激光等离子体M带细致 关键词： 双电子复合 类铁金离子类镓金离子 复合速率系数     

等电子谱线法测量Mg/Al等离子体电子温度空间分布

 在“星光Ⅱ”激光装置上对Mg/Al混合材料埋点靶进行三倍频激光打靶实验,用空间分辨晶体谱仪测量靶材料发射的X光光谱,获取了示踪离子谱线实验数据。采用多组态Dirac-Fock方法计算所需原子参数,并在局域热动平衡条件下建立了双示踪离子谱线强度比随电子温度的变化关系。在此基础上由双示踪元素等电子谱线法确定了Mg/Al混合材料埋点靶激光等离子体电子温度空间分布。     

历代景德镇青花瓷光谱特征分析研究

景德镇青花瓷是我国最具代表性的陶瓷品种之一,具有很高的学术价值和社会经济价值。不同年代的青花瓷仅靠外观难以区分,如何快速准确区分不同年代的景德镇青花瓷是文物保护界面临的一个难题。高光谱技术是一种完全无损的分析方法,并已经在壁画、字画等文物的颜料分析中得到成功应用,目前还没有关于瓷器文物的高光谱研究成果出现。选取28个历代景德镇青花瓷碎片样本,使用地面光谱仪测量样本胎釉和青花料部位反射率光谱,分析其典型光谱特征,并对历代青花料光谱特征参量变化趋势进行了分析。研究表明,青花料部位在可见近红外波段光谱特征较为显著,历代青花料光谱特征参量有较明显的差异,并有一定的变化规律。高光谱技术对于景德镇青花瓷的断代研究有很大潜力。     

Effect of defects in the rare-earth sublattice of the Kondo insulator YbB<Subscript>12</Subscript> on its spectral characteristics and magnetic susceptibility

The results of measuring the static and dynamic magnetic susceptibilities of several series of samples, which are based on the YbB₁₂ Kondo insulator and are substituted in the rare-earth sublattice, are analyzed. Substitution is performed by nonmagnetic isoelectronic Lu ions; magnetic isoelectronic Tm ions; and nonisoelectronic nonmagnetic Y, Sc, and Zr ions. The static susceptibility is measured by a SQUID magnetometer in weak fields, and the dynamic susceptibility is determined from inelastic neutron scattering data. The magnetic properties are simulated using the spectral function found from neutron experimental data. A one-to-one correspondence is established between the influence of an impurity on the initial neutron spectrum and the temperature dependence of the static susceptibility. The results obtained allow one to analyze the relation between the magnetic properties and the electronic structure of the compounds of the given class.     

New classification in the spectra of highly ionized Cu and Zn in the region below 55 Å

The extreme ultraviolet spectra of Cu and Zn are analyzed. New classifications in the wavelength region below 55 Å are tabulated. The spectra were excited by focussing high power laser radiation on plane targets in a vacuum. The spectral lines reported here correspond mainly to the transitions between levels of principal quantum number 3 and 4 in Cu XVI to XIX and Zn XVII to XX. The identifications are based on extrapolations of published data for isoelectronic ions.     

Time-resolved luminescence spectra of AgBr at high excitation densities

Time-resolved luminescence measurements in AgBr at 1.9K and cw excitation densities up to 100 kW/cm² reveal new emission bands with strong vibrational structure close to the free exciton. Besides the emission of excitons bound to isoelectronic I^- traps two different luminescence systems are separated by making use of their different lifetime and excitation behaviour. The results are discussed in view of the electron-hole-liquid recombination recently found in the investigated spectral range.     

The isoelectronic series ScF through ThO—I notes on the band spectra of TiO,HfO and ThO

The band spectra of TiO, HfO and ThO are treated, especially for later use in connection with the isoelectronic (in valence electrons) series ScF, TiO, ZrO, HfO and ThO. Franck-Condon factors and r-centroids for 12 HfO and ThO band systems are presented. Some recommendations for future spectral studies on UO are given, based on ThO results, since ThO apparently is the only diatomic oxide of the actinides to have known electronic band spectra.     

Regularities and similarities in plasma broadened spectral line widths (Stark widths)

Regularities and similarities in plasma broadened line widths have been studied by a comprehensive analysis of existing experimental data. Regularities are expected on the basis of general atomic structure considerations, and should be evident for spectral series, for corresponding transitions in homologous atoms and in isoelectronic sequences. Furthermore, similarities of line widths are expected for multiplets, supermultiplets and, to a lesser degree, for transition arrays. A comprehensive examination of literature data has been undertaken, which shows generally a close adherence of the measured data to the expected regularities. A few notable exceptions are also given.     

Magnetic and magneto-optical properties of ion-synthesized cobalt nanoparticles in silicon oxide

The magnetic and magneto-optical properties of ion-synthesized cobalt nanoparticles in the amorphous silicon oxide matrix are investigated as a function of the implantation dose. The analysis of the field dependences of the magnetization and the magneto-optical Faraday and Kerr effects demonstrates that, as the ion implantation dose increases, the superparamagnetic behavior of an ensemble of cobalt nanoparticles at room temperature gives way to a ferromagnetic response with the anisotropy characteristic of a thin magnetic film. The magnetization curves for the superparamagnetic and ferromagnetic ensembles of cobalt nanoparticles are simulated to determine their average sizes and the filling density in the irradiated layer of the silicon dioxide matrix. It is revealed that the spectral dependences of the Faraday and Kerr effects for ion-synthesized cobalt nanoparticles differ substantially from those for continuous cobalt films due to the localized excitations of free electrons in the nanoparticles.     

类氢离子Mg^11＋,Al^12＋光谱参数的理论计算及在温度诊断中的应用

采用“多功能相对论原子结构计算程序“GRASP2（1992）,分别计算了类氢离子Mg^11 ,Al^12 能级之间电偶跃迁（E1）的波长,几率和振子强度,其中跃迁波长值与实验值相吻合,充分利用计算结果,采用等电子线率法对文献[4]的谱线强度比测温实验进行理论上的探讨,即利用原子序数相差不大（ΔZ=1,2)的两种示踪原子相同离化态的同种跃迁谱线进行电子温度诊断,以期望提高测温精度。