Nb XIII离子3d94s2, 3d94s4p, 3d94p2 组态能级结构与跃迁的理论研究

用准相对论Hartree-Fock方法对Nb XIII离子二电子激发组态3d⁹4s², 3d⁹4s4p, 3d⁹4p² 的能级结构做了全面系统的理论计算研究.在对已有研究结果分析的基础上, 运用最小二乘方法对径向积分参数进行了优化计算, 得到了与这些组态有关的电偶极允许跃迁的谱线波长和跃迁概率.计算结果与最新的实验值做了对比分析, 表明本文计算结果是准确的. 研究发现, 波长40.92 nm的谱线, 属于3d⁹4s(¹D)4p²F_7/2–3d⁹ (²D)4s^{2 2}D_5/2 的跃迁谱线, 而不属于3d⁹4s (¹D)4p⁴D_7/2–3d⁹(²D)4s^{2 2}D_5/2 的跃迁谱线, 即上谱项能级为²F_7/2, 而不是⁴D_7/2. 关键词： Nb XIII离子 二电子激发组态 谱线波长 跃迁概率     

电子相关对Xe10+离子4d8—4d75p跃迁系跃迁概率的影响

应用多组态Dirac-Fock(MCDF)方法,对Xe¹⁰⁺离子进行了理论计算,获得了跃迁波长和概率等数据.通过逐步引入4dⁿ—5pⁿ(n=1, 2, 3)电子相关的相互作用组态,重点研究了电子相关效应对4d⁸—4d⁷5p跃迁系跃迁概率的影响.结果显示电子相关效应显著,表明了欲得到精确的4d⁸—4d⁷5p的振子强度(跃迁概率)数据,理论计算中至少要包括到4d²—5p²的电子相关组态的影响.与实验测得的跃迁波长比较发现,理论结果与之有着较好的一致性;同时理论跃迁概率在两种规范下的结果符合得相当精确,显示了计算结果的可靠性. 关键词： 多组态Dirac-Fock(MCDF)方法 电子相关 跃迁概率     

CuⅩⅧ离子谱线波长和跃迁概率的理论计算

用多组态HFR方法对CuⅩⅧ离子n=3complex组态能级结构进行了综合的分析与计算.在已 有实验工作的基础上，运用参数拟合方法获得了能级结构参数的最佳计算值，由这些参数值 预测计算了CuⅩⅧ离子n=3complex组态能级以及3s²—3s3p,3s3p—3p ²,3p²—3p3d,3s3d—3p3d,3p3d—3d²组态能级跃迁的谱线波 长，振子强度和跃迁概率. 关键词： CuⅩⅧ离子 原子能级 跃迁谱线波长 振子强度和跃迁概率     

铥原子激发能级超精细结构常数的测定

用铥空心阴极灯,采用光电流光谱技术测得铥原子21条一级跃迁谱线,确定了相应跃迁上能级的超精细结构常数,其中7个能级的参数为首次发表,运用同一空心阴极灯,采用双色双光子级联共振技术,由荧光法首次测得4个第二激发能级的超精细结构常数.     

高离化态类镍离子电子碰撞激发过程的相对论扭曲波理论研究

利用相对论扭曲波方法和新发展的研究电子碰撞激发过程的计算程序REIE06,系统计算了电子碰撞激发高离化态类镍Gd³⁶⁺和Rn⁵⁸⁺—U⁶⁴⁺(Z=86—92)离子从基态到4l(l=s,p,d,f)次壳层精细结构能级的碰撞强度和截面.研究了随等电子系列变化时,从基态到与X射线激光有关的3d⁹4p和3d⁹4d激发态能级的电子碰撞激发截面随Z的变化,讨论了强的组态相互作用对高离化态类镍离子截面的影响.通过对Gd³⁶⁺离子涉及X射线激光跃迁的相关能级电子碰撞激发速率系数的计算,分析了等离子体中电子温度对碰撞过程的影响.同时,目前部分计算结果与以往的理论结果进行了比较,得到了很好的一致性. 关键词： 电子碰撞激发 相对论扭曲波方法 高离化态类镍离子     

SrAl12O19：Pr3+中4f2→4f2电偶极跃迁强度参量化

对SrAl₁₂O₁₉：Pr³⁺中4f²→4f²电偶极跃迁强度的参量化进行了研究.考虑明确的4f5d组态成分与4f²跃迁能级混杂对4f²组态内跃迁的影响.引入新的强度参数T_kq，参数值由³P₀能级的相关实验数据拟合.利用拟合的参数T₃₃和T₅₃计算¹S₀向下各能级发射的跃迁强度，计算值与实验及Judd-Ofelt理论的结果进行了比较. 关键词： 12O₁₉：Pr³⁺')" href="#">SrAl₁₂O₁₉：Pr³⁺ 宇称态混杂 4f5d组态 强度参数     

运用光电流光谱测定钬原子能级的超精细结构

用自制钬空心阴极灯,运用光电流光谱技术在569nm～600nm谱区内首次测定了元素钬的9条谱线,确定其相应跃迁能级,及超精细结构常数.     

硫化锰电子结构的软X射线共振非弹性散射研究

利用软X射线共振非弹性散射谱(resonant inelastic soft X-ray scattering, RIXS)对3d过渡金属硫化物中的硫化锰(MnS)电子结构进行了研究.通过分析Mn²⁺的2p⁶3d⁵→2p⁵3d⁶→2p⁶3d⁵二次光子过程，得到了共振非弹性散射谱中的两类非弹性峰，d-d电子跃迁和电荷转移(charge-transfer)跃迁.这两部分跃迁分别共振增强于L边附近及伴随峰附近.基于Hartree-Fock方法的多重态计算分别模拟了原子近似下和立方体O_h对称群下共振非弹性散射谱及吸收谱.计算得MnS实际晶体场10Dq值介于0.80eV—0.85eV之间.对MnS和MnO CT跃迁差异的讨论表明MnS较强的CT跃迁来源于其较窄的能隙宽度. 关键词： 软X射线共振非弹性散射 软X射线吸收谱 d-d跃迁 电荷转移     

SrI 4dnp和4dnf奇宇称J=1系列自电离态光谱

用激光三步激发方法,以4d^{2 3}P₀价态为中间态,观察了Sr原子4dnp和4dnf奇宇称J=1系列自电离态光谱,在59570—60300cm^-1范围内,测定了60个自电离能级,其中大多数可归属于分别收敛于4d²D_3/2和4d²D_5/2电离限的6个自电离系列,讨论了光谱线的线型和组态相互作用。 关键词：     

类氖CaⅪ和MnXVI2P53L或4L-2P54L1跃迁波长和能级的多组态Dirac-Fock计算

本文用MCDF-EAL计算模式,计算了可能成为超真空紫外区的类氖等离子体激光工作物质的CaⅪ与MnXVI类氖离子的1s²2s²2p⁵3l与1s²2s²2p⁵4l组态的多重态能级的能量值及3l-4l¹和4l-4l¹组态的各多重态能级间的可能的跃迁波长位,3l-4l¹跃迁波长的计算值与实验数据比较符合得很好。文中还预言了4l-4l¹的可能的跃迁波长,     

Spectral analysis of the 4d6s configuration in eight times ionized xenon, Xe IX

A capillary light source was used to observe the spectrum of eight times ionized xenon, Xe IX, in the vacuum ultraviolet range, 270-2000 Å. Sixteen transitions have been identified as combinations between energy levels of the 4d⁹6s with 4d⁹5p configuration, and all 4d⁹6s levels have been determined. The present analysis is based on an accurate extrapolation of energy parameters and experimental energy level values in the Pd I isoelectronic sequence. The energy parameters were obtained with Hartree-Fock relativistic calculations. Least-squares parametric calculation has been carried out to study the fit between experimental and theoretical values.     

Palladium-like XeIX-CeXIII spectra: Effective interaction and radiative constants

A semiempirical least squares method is used to determine the wave functions for the intermediate coupling between the 4d ⁹5s, 4d ⁹5p, and 4d ⁹5d levels in the XeIX-CeXIII spectra and to calculate the radiative lifetimes of the 4d ⁹5p and 4d ⁹5d levels in these spectra.     

Termanalyse der 4d 9 5s 5d-Konfiguration im Bogenspektrum des Silbers

The arc spectrum of silver has been remeasured in the range of 1100 to 9800 Å. This yielded some 140 new lines. Analysing these lines together with about 50 previously unidentified lines of Shenstone established 20 new levels. The configurations 4d ⁹ 5s 5p and 4d ⁹ 5s 6s are now completely analysed. In the 4d ⁹ 5s 5d-configuration about half of the expected levels were identified. Two new 4d ⁹ 5s 7s levels were found.     

Spectra of rubidium-like Pd X-Sn XIV ions

Palladium, silver, and cadmium spectra excited in a low-inductive vacuum spark have been recorded on a vacuum grazing-incidence spectrograph with a grating of 3600 lines/mm and 3 m in radius, in the range 120–350 Å. The 4p ⁶4d-(4p ⁶5p + 4p ⁶4f + 4p ⁵4d ²) transitions in rubidium-like Pd X-Cd XII spectra have been investigated. Twenty two new spectral lines have been identified from the Dirac-Fock and Hartree-Fock calculations and the known lines were measured with high accuracy. The fine-structure intervals for the 4p ⁶4d ² D ground state and the energies of six, seven, and ten energy levels of excited configurations in Pd X, Ag XI, and Cd XII, respectively, were determined. On the basis of the analysis of isoelectronic regularities in the position of the energy levels, the previous identifications for the In XIII and Sn XIV spectra were refined.     

Radiative Lifetimes of the Energy Levels of Palladium-like Ions Pr XIV and Nd XV

Radiative lifetimes for the 4d⁹4f, 4d⁹5p, 4d⁹5d, and 4d⁹6s levels in the spectra of palladium-like ions Pr XIV and Nd XV are calculated in the electric-dipole approximation by the intermediate coupling semiempirical method with the use of experimental energy levels available in the literature. The radial integrals of transitions necessary for calculating absolute values of transition probabilities are obtained in the length form with Hartree–Fock functions.     

High-lying odd configurations of quintuply ionized bismuth (Bi VI)

The spectrum of Bi VI in a wavelength region of 177–431 Å was studied. The transitions from the levels of the interacting configurations 5d ⁸6s6p+5d ⁹7p+5d ⁹5f+5d ⁹6f to the levels of the 5d ¹⁰ and 5d ⁹6s configurations were analyzed. 174 spectral lines were identified, and 79 new levels of high-lying odd configurations of Bi VI were found.     

4d 95p 2 configuration in the spectra of in III-Te VI

The radiative 4d ¹⁰5p-4d ⁹5p ² transitions in the spectra of the In III, Sn IV, Sb V and Te VI, ions, belonging to the silver isoelectronic sequence, have been investigated in the range 250–600 Å with high resolution. The energies of most levels of the 4d ⁹5p ² configuration with J = 1/2, 3/2, and 5/2, involved in the transitions to the 4d ¹⁰5p configuration, are found. Along the isoelectronic sequence, the 4d ⁹5p ² configuration passes from the position below the ionization limit 4d ¹⁰ in Te VI to the position above this limit in In III with corresponding autoionization effects. The autoionization widths of levels are measured. The data obtained are compared with the results of calculations by the Hartree-Fock and semiempirical methods.     

双爆炸膜内壳层光电离X射线激光实验研究

报道了Pd-NaF,Pd-Cu,Ag-NaF和Ag-Cu耦合双爆炸膜内壳层光电离X射线激光的实验方法和一些实验结果。结果表明,在本实验条件下,激光加热NaF或Cu靶产生的1keV区的光子,可以增强Pd或Ag等离子体中类-Cu离子的3d¹⁰4p-3d⁹4s²软X射线发射的强度,但不足以形成X射线激光的输出。 关键词：     

Review of Ni-like ion X-ray laser research at Lawrence Livermore National Laboratory

We have demonstrated saturated output on several nickel-like ion X-ray lasers ranging from niobium to silver by using a psec, high-power, chirped-pulse-amplification, tabletop laser. These results have been achieved at wavelengths from 20.3 to 13.9 nm on the Ni-like 3d⁹4d¹S₀→3d⁹4p¹P₁ laser line using a total of 5 to 7 J of energy in a traveling wave excitation scheme. Strong amplification is also observed for Ni-like Sn at 11.9 nm. Gain of 41 cm⁻¹, gain-length product of 18, and output energy of 12 μJ are measured for the Ni-like Pd line at 14.7 nm. For Ni-like Mo, experiments are done using multilayer mirrors to obtain two-dimensional images of the output aperture of the laser and to measure the total laser energy as a function of various parameters such as the delay between the short and long pulses and the energy of the two pulses. For Mo we measure an output energy of 2 μJ and a gain-length product of 16.6. To model the Mo experiments, the LASNEX code is used to calculate the hydrodynamic evolution of the plasma and provide the temperatures and densities to the XRASER code, which then does the kinetics calculations to determine the gain. The temporal and spatial evolution of the plasma is studied both with and without radiation transport included for the 4f and 4p→3d Ni-like Mo resonance lines. High gains are predicted and observed for both the 3d⁹4d¹S₀→3d⁹4p¹P₁ laser line at 18.9 nm and the 3d⁹4f¹P₁→3d⁹4d¹P₁ photopumped line at 22.6 nm.