伴线强度比诊断激光等离子体温度

为诊断玻璃壳靶等离子体硅的电子温度,根据Gabriel日冕模型的理论目前已有3种计算方法:(1)利用类氢共振线(1s-2P)与对应伴线强度比(见图1曲线1);(2)利用类氦共振线(1s~2-1s2p)与对应伴线强度比;(3)利用两根共振线强度比。记类氢类氦共振线及其对应伴线的强度分别为I_(HR),I_(HeR),I_(HS)及I_(HeS)。利用所得到的X光谱线强度的实验数据用上述3种方法往往不能获得较一致的电子温度,主要原因在于共振线是光学厚的,     

高离化态类氖离子的电子碰撞激发特性研究

利用基于多组态Dirac-Fock(MCDF)理论方法的原子结构和性质计算程序GRASP92和全相对论扭曲波电子碰撞激发计算程序REIE06,系统计算了类氖离子(Z=50—57)激发组态2s22p53l和2s2p63l(l=s,p,d)的能级结构和碰撞激发截面,总结了碰撞激发截面随入射电子能量的变化规律,讨论了实验中感兴趣的(2p1/23d3/2)1→2s22p61S0(标记为3C线)与(2p3/23d5/2)1→2s22p61S0(标记为3D线)跃迁线强度比值的沿等电子系列特性和强组态相互作用对高离化态类氖离子截面的影响.     

RhⅫ,PdⅩⅣ和AgⅩⅤ离子4s24p3-4s24p25s跃迁的扩展分析

用相对论Hartree-Fock方法对YⅦ-AgⅩⅤ离子4s24p3 和4s24p25s组态的能级结构进行了系统的理论计算.通过分析能级结构的Slater径向积分参数沿等电子序列的变化规律,运用参数拟合外推(或内插)的方法计算了上述离子组态的能级结构参数.在此基础上,计算了RhⅫ,PdⅩⅣ和AgⅩⅤ离子4s24p3(4S3/2,2P1/2,3/2, 2D1/2,3/2)和4s24p25s(4P1/2,3/2,5/2,2P1/2,3/2, 2D3/2,5/2,2S1/2)组态的精细结构能级以及这两个组态之间电偶极允许跃迁的全部35条谱线波长与相应的振子强度,其中PdⅩⅣ和AgⅩⅤ离子的所有数据纯属目前的预测计算值.     

类氦Fe~(24+)离子的电子碰撞激发及辐射级联特性研究

基于全相对论扭曲波(RDW)电子碰撞激发计算程序REIE06,系统计算了类氦Fe~(24+)离子基态1s~(21)S_0到激发态1s2s和1s2p精细结构能级的碰撞强度和截面,分析了在不同入射电子能量下碰撞强度的变化规律,详细研究了在6.86 Ke V和9.94 Ke V能量下,碰撞辐射级联效应对类氦Fe~(24+)离子w线(1s~(21)S_0→1s2p~1P_1)、x线(1s~(21)S_0→1s2p~3P_2)、y线(1s~(21)S_0→1s2p~3P_1)和z线(1s~(21)S_0→1s2s~3S_1),x/w、y/w和z/w线强度比值的影响,总结了一些有意义的结论.部分计算结果与其它实验和理论结果进行了比较,取得了很好的一致性.     

弛豫与关联效应对NII离子2s22p3s3P1—2s22p21D2与2s22p3s1P1—2s22p23P0,1,2自旋禁戒跃迁概率的影响

用多组态Dirac-Fock方法，并系统考虑相对论效应、电子关联、弛豫效应等重要贡献，计算了NII离子2s22p3s 3P1—2s22p21D2和2s22p3s 1P1—2s22p23P0,1,2自旋禁戒跃迁概率和振子强度-通过比较计算证实：弛豫和关联效应对禁戒跃迁概率的影响非常大，考虑了这些效应后，计算结果有显著的改善-由跃迁概率和振子强度的计算值推断，2s22p3s 3P1—2s22p21D2的谱线强度应该比原有的理论预言值小- 关键词： 跃迁概率 多组态Dirac-Fock方法     

硼基态等电子序列磁偶极M1精细结构间隔和光谱跃迁参数

采用全相对论量子力学GRASP2程序,选取三电子组态1s22s22p, 1s22s2p2, 1s22p3,有限核费米模型,Breit和QED的高阶微扰修正,系统地研究了类硼等电子序列磁偶极M1 1s22s22p*"2P3/2-2P1/2( Z=10～100)光谱跃迁的精细能级结构间隔,跃迁概率和振子强度,计算结果表明1s22s2 2p和1s22p3组态之间存在明显的非动力学组态相关,采用三电子组态计算的精细能级结构间隔较单电子组态的计算结果有了显著的改善.     

类钠CrⅩⅣ-FmXC离子3s2S1/2-3p2P1/2,3/2的跃迁计算

用多组态HFR方法系统地计算了高剥离类钠CrⅩⅣ-FmXC离子(Z=24～100)单电子组态的能级,相应谱线的跃迁波长,跃迁概率和振子强度.在已有实验的基础上,用自编的Fortran程序对HFR计算的3p2P1/2,3/2能级结果进行了最小二乘拟合计算.从而预测计算了CrⅩⅣ-FmXC离子3s2S1/2-3p2P1/2,3/2跃迁的谱线波长.计算结果与已有的实验值均符合得很好,尤其是与最近测量的实验值相当一致;而与其他理论预测值也基本吻合.     

类硼氧离子基态双电子复合速率系数的研究

由于氧广泛存在于星际物质中,对氧等离子体的诊断十分重要。双电子复合速率系数是对等离子体平衡状态诊断的重要参数。本文采用全相对论Flexible atomic code(FAC)研究了类硼氧离子从基态2s22p1(J=1/2)俘获电子,经过2s12p2 n′l′双激发态通道的双电子复合速率系数。忽略贡献很小的辐射级联效应,考虑组态相关,细致计算了n′≤9,l′≤n′-1的所有组态。使用了n′-3标度规律采用组态-组态外推法计算,计算了n′≤1000的所有组态总双电子复合速率系数。分析了双电子复合速率系数与不同被俘获轨道主量子数n′和轨道量子数l′的关系,认为对双电子复合其主要贡献的是n′=3和n′=5,且DR系数在l′=2时出现峰值。即基态通过2s2p2 n′l′的双电子复合伴线光谱中最强的光谱线对应跃迁为2s2p23d的双电子复合过程。该通道总的DR系数随温度升高而先增后减,在0.5eV左右出现最大值,认为此温度下双电子复合效率最高。低温时对于n′较大的组态可以忽略,高温时则需要考虑。     

激光气体靶产生的类氖氪离子4d-2p共振跃迁其类Na 3l4l′双电子伴线的研究

用相对论多组态(HXR)方法,详细计算了类Ne氪离子4d-2p类Na3l4l′双电子伴线波长和强度因子,并模拟了实验光谱,解释了最新利用激光气体靶产生的0.525～0.555nm范围的氪X-Ray光谱,计算结果与实验符合得相当好。此外,还讨论了组态相互作用对双电子伴线结构的影响。     

MoⅩⅣ-RuⅩⅥ离子的3d104s-3d9 4s4p跃迁谱线波长和振子强度的计算

在对GeⅣ一RuⅩⅥ离子3d94s4p组态能级结构的组态相互作用理论分析计算的基础上,进一步分析了关联效应,量子电动力学(QED)效应及其他效应对等电子序列离子能级结构的影响,找出了沿等电子序列离子能级变化的规律性.在前人研究工作的基础上,预测计算了MoⅩⅣ-RuⅩⅥ离子3d94s4p(J=1/2,3/2)组态能级,由此计算了MoⅩⅣ-RuⅩⅥ离子3d104s-3d94s4p(J=1/2,3/2)跃迁谱线波长,振子强度和跃迁概率.     

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.     

类镉离子5s^2 ^1S0→5s5p^1,3P1跃迁振子强度的计算

应用屏蔽氢模型计算类Ｃｄ离子５ｓ２１Ｓ０→５ｓ５ｐ１Ｐ１共振跃迁振子强度，引入ｊ－耦合中校正系数Ｋ和混合角θ导出５ｓ２１Ｓ０→５ｓ５ｐ３Ｐ１跃迁振子强度表达式。计算结果和其他作者进行了比较，并给出某些讨论。     

利用类铜离子谱线诊断银等离子体电子密度

测量了激光加热块状银靶产生的等离子体XUV光谱.计算了T_e分别为65eV,86eV和130eV时,AgXIX4s-4P,4P-4d,4d-4f7条谱线在不同电子密度时的强度.根据AgXIX4d~2D_(s/2~-)4f~2F_(r/2)和4P~2P_(3/2)-4d~2D_(s/2)两条谱线的强度比,推导了激光银等离子体电子密度.当入射激光功率密度W为6×10~(12)W/cm~2时,银等离子体电子密度N_e=1×10~(20)/cm~3. 关键词：     

Xe8+离子双电子复合速率系数的理论研究

利用基于全相对论组态相互作用理论的FAC程序包, 详细研究了温度在0.1~1650 eV范围内Xe8+离子的双电子复合(DR)过程。 通过比较4s, 4p和4d壳层电子激发的双电子复合速率系数, 发现温度在10 eV以上时, 内壳层4p电子激发的双电子复合速率数对总双电子复合速率系数有很重要的贡献, 而4s电子激发对总双电子复合速率数贡献小于7.5%。 给出了△n=0, 1和2 三类芯激发对总双电子复合速率系数的贡献以及自由电子俘获到不同主量子数的双电子复合速率系数, 发现△n=2的芯激发和n′＞15的DR速率系数对总DR速率系数的贡献也很重要。 进一步给出了△n=0, 1和2 三类芯激发和总DR速率系数的拟合参数, 拟合结果和计算值符合, 偏差小于1%。 通过对双电子复合、 辐射复合以及三体复合速率系数的比较得知, 在温度高于1 eV时, DR过程是Xe8+离子的主要复合过程。Based on the fully relativistic configuration interaction method, theoretical calculations are carried out for the dielectronic recombination (DR) rate coefficients of Xe8+ ions in the temperature region from 0.1 to 1 650 eV. The comparison of the DR rate coefficients from 4s, 4p and 4d subshell excitations shows that 4d subshell excitation dominates in the whole temperature region. The contribution from 4p subshell excitation is very important at temperature above 10 eV and the contributions from 4s subshell excitation is lower than 7.5% in the whole temperature region. Similarly, the comparison of the DR rate coefficients through △n=0, 1 and 2 core excitation shows that the contribution from △n=2 core excitation can not be neglected, the contributions from n′＞15 can also not be neglected. The DR rate coefficients of △n=0, 1 and 2 core excitation and the total DR rate coefficients are fitted with some parameters, which are in good agreement with theoretical calculations values (within 1% difference). The total DR rate coefficients are greater than radiative recombination (RR) and three body recombination (TBR) rate coefficients at temperature above 1 eV. Therefore, the DR process can strongly influence the ionization balance of laser produced xenon plasmas.     

Theoretical studies on dielectronic recombination of neonlike gold and its effects on plasma ionization balance and radiation energy

The dielectronic recombination (DR) of neonlike gold ions is investigated employing the flexible atomic code based on the relativistic configuration interaction method, and its influence on the ionization balance and radiation energy in high-temperature plasma is also studied. The total resonance strength for LMM configuration complex is in a good agreement with the experimental measurement and other theoretical works. The DR rate coefficients are calculated and compared with the three-body recombination and radiative recombination rate coefficients. The DR process is the dominant recombination mechanism of Ne-like gold ions for plasma with temperature T_e≥6.5 keV and density n_e≤2×10²² cm^-3, which is close to the condition of X-ray conversion region in the inertial confinement fusion. Moreover, the DR satellite spectra of LMM, LMN and LMO resonances are simulated, and compared with the intensities of the corresponding resonance lines induced by the electron impact excitation. The intensity ratio of the satellite line 3D’ [(2p⁵_3/23d_3/23d_5/2)_J=5/2[(2p^{5}_{3/2}3d_{3/2}3d_{5/2})_{J=5/2}–(2p⁶3d_3/2) _J=3/2](2p^{6}3d_{3/2})_{ J=3/2}] and the resonance line 3D [(2p⁵_3/23d_5/2)_J=1[(2p^{5}_{3/2}3d_{5/2})_{J=1}–(2p⁶)_J=0](2p^{6})_{J=0}] is given, which can be applied for diagnostics of plasma temperature.     

类锂离子(Z=11～20)1s23p-1s2nd(n=6,7)的跃迁能和振子强度

用全实加关联(FCPC)方法计算类锂离予体系(Z=11～20)1s2nd(n=6,7)态的非相对论能量.相对论及质量极化效应对能量的修正用微扰论计算,量子电动力学(QED)修正利用有效核电荷方法估算.在此基础上计算了1s23p-1s2nd(n=6,7)的跃迁能及振子强度,对现有的关于1s2nd(n=6,7)态的精细结构的实验数据的可靠性提出质疑.     

Resonance enhanced electron impact excitation for P-like Cu XV

Employing both the Dirac R-matrix and the relativistic distorted wave with independent process and isolated resonance approaches, we report resonance enhanced electron impact excitation data(specifically, effective collision strengths)among the lowest 41 levels from the n = 3 configurations of Cu XV. The results show that the latter approach can obtain resonance contributions reasonably well for most excitations of Cu XV, though a comparison between the two approaches shows that the close-coupling effects are truly significant for rather weak excitations, especially for two-electron excitations from the 3s3p4 to 3s23p23d configuration. Resonance contributions are significant(more than two orders of magnitude) for many excitations and dramatically influence the line intensity ratios associated with density diagnostics.     

X-ray-line diagnostic of magnetic field strength for high-temperature plasmas

An x-ray line diagnostic for use in magnetic field measurements in high-temperature plasmas has been identified. The intensity of the otherwise strictly forbidden 1s(2)2s(2)2p(1/2)2p(4)(3/2)3s(1/2) 3P0-->1s(2)2s(2)2p(6) 1S0 transition in neonlike ions is shown to depend on the magnetic field strength. The field dependence is illustrated between one and 3 T in the Ar8+ spectrum. The line is well resolved, bright, and close to reference lines, making it an experimentally simple to use diagnostic.     

双光子共振非简并四波混频测量钡原子里德伯态碰撞展宽中的伴线研究

研究了采用双光子共振非简并四波混频技术测量原子里德伯态碰撞展宽时出现的伴线现象, 测量了不同缓冲气压下的钡原子里德伯态6snd ¹D₂ (n=16, 22, 36) 的四波混频谱线, 研究了伴线随主量子数n 的变化曲线以及伴线信号强度随缓冲气压压强的变化曲线, 分析了伴线对NFWM谱线的线宽的影响, 发现考虑伴线对四波混频谱线线宽的贡献, 可以对NFWM模型下测量到的碰撞展宽系数进行修正.     

Energy levels and radiative lifetimes of 3pns 3P0 and 3pnd 3P0 series of Si I

The energy levels and lifetimes of 3pns ^3po （n = 7 - 35） and 3pnd ^3p0 （n = 6 - 17） series of neutral silicon are calculated and predicted by means of multichannel quantum defect theory （MQDT）. In addition, the perturbation caused by core-excited state 3s3p^3 is discussed. The 3pnd ^3p0 series, especially 3p4d ^3p0, 3p5d ^3P0, and 3p6d ^3P0 are perturbed strongly by the core-excited state 3s3p3 ^3P0. These cause the lifetime of 3pnd ^3P0 （n = 5 - 7） to be less than that of 3p4d 3Po. The lifetimes of 3p14d ^3P0 （65479.14 cm^-1） and 3p16d ^3p0 （65608.77 cm^-1） are less than that of their frontal states respectively, because these states are perturbed by 3p22s ^3p0 （65476.48 cm-1） and 3p30s ^3p0 （65608.99 cm^-1） respectively.