共查询到19条相似文献,搜索用时 156 毫秒
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在分析双洞相关退激发对双洞态退激发的贡献较小的基础上,依据辐射-俄歇-双俄歇级联退激发模型(RACDA)研究了Mg1+(1s-1)(K壳层单洞态镁离子)和Mg2+(1s-2)(K壳层双洞态镁离子)的退激发过程,计算了它们的末电离态离子的分布,并与辐射-俄歇级联退激发模型的结果进行了比较.RACDA模型计算的Mg1+(1s-1)的4价末电离态离子的相对丰度较大,而辐射-俄歇级联退激发模型(RAC)的结果中就没有出现4价离子;两种模型计算Mg2+(1s-2)的6价末电离态离子的丰度非常大,而RAC模型下的Mg2+(1s-2)退激发后不产生6价离子.
关键词:
双洞态退激发
RACDA退激发模型 相似文献
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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 相似文献
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研究了高电荷态离子Arq+(q=16,17,18)入射金属Be,Al,Ni,Mo,Au靶表面产生的X射线谱.实验结果表明,Ar的Kα-X射线是离子在与固体表面相互作用过程中固体表面之下形成空心原子发射的.电子组态1s2的高电荷态Ar16+离子在金属表面中性化过程中,存在的多电子激发过程使Ar16+的K壳层电子激发产生空穴,级联退激发射Ar的Kα 特征X射线.Ar17+离子在金属表面作用过程中产生的X射线谱形与靶材料没有明显的关联,入射离子的Kα-X射线产额与其最初的电子组态有关,靶原子的X射线产额与入射离子的动能有关.
关键词:
高电荷态离子
空心原子
多电子激发
X射线 相似文献
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利用“二态矢量模型”详细研究了高电荷态O7+,N6+离子入射Al表面时中间里德伯态的形成过程,给出了电子被俘获至不同量子数(n A=2-7)的几率,以及电子俘获至里德伯态最可能的离子-表面距离.计算结果表明,较大的主量子数nA对应较小的里德伯态几率,因此O7+,N6+离子入射Al表面时辐射的X射线主要来源于较小的n A至基态的退激.为了验证计算结果,测量了O7+,N6+离子入射Al表面的X射线发射谱,并运用FAC程序计算了不同高里德伯态退激到基态的跃迁能(np–1s).实验测量到O,N的K-X射线峰,其特征峰的中心值接近主量子数n=2至n=1的跃迁能,说明发射的X射线主要来源于2p–1s的跃迁,与“二态矢量模型”理论计算的几率一致. 相似文献
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基于Cowan相对论多组态HFR程序,计算了高离化类锂钨离子在0.1-9keV能量范围内,对应于Δn=0.1的态-态双电子复合速率系数。讨论了速率系数随电子温度,复合类型及中间双激发态中俘获电子的主量子数的变化。 相似文献
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用HFR波函数对低密度类氢Ni27+等离子体与电子相互作用的KLn和KMn共振激发的双电子复合过程进行了细致的理论计算研究.根据可能的重要辐射衰变通道,分析了Ni27+等离子体Kα 型和Kβ 型辐射衰变的双电子复合速率系数随旁观电子主量子数n和轨道角动量量子数l与电子温度的变化行为,计算了Ni27+等离子体双电子复合过程的总速率系数.研究结果表明,在低密度条件下,Kα 型和Kβ型辐射衰变的分支双电子复合速率系数与旁观电子主量子数n和轨道角动量量子数l有重要关系,前者的分支速率系数远大于后者.
关键词:
27+离子')" href="#">Ni27+离子
Kα型和Kβ型辐射衰变')" href="#">Kα型和Kβ型辐射衰变
双电子复合
速率系数 相似文献
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本文用全量子力学方法计算了Ti、Cr类He总双电子复合速率系数和态-态双电子复合速率系数,给出了Ti、Cr类He态-态双电子复合速率系数与旁观主量子数、与原子实耦合对称性,以及与谱项多重性、对称性和角动量之间的关系.计算结果显示1s2pnp→1s2np和1s2pnd→1s2nd两衰变通道的双电子复合速率系数占总双电子复合速率系数的75%,成为对总双电子复合速率系数贡献最大的两个复合通道.本文得到了能用于冕区等离子体诊断目的的Ti、Cr类 He双电子复合数据. 相似文献
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V.L. Jacobs J. Davis J.E. Rogerson M. Blaha 《Journal of Quantitative Spectroscopy & Radiative Transfer》1978,19(6):591-598
The results of calculations of the ionization equilibrium and radiative energy loss rates for C, N and O ions in low-density plasmas are presented for electron temperatures in the range 104–107 °K (~1–103 eV). The ionization structure is determined using the steady-state corona model, in which electron impact ionization from the ground states is balanced by direct radiative and dielectronic recombination. Using an improved theory, detailed calculations are carried out for the dielectronic recombination rates in which account is taken of all radiative and autoionization processes involving a single-electron electricdipole transition of the recombining ion. The radiative energy loss processes considered are electron-impact excitation of resonance line emission, direct radiative recombination, dielectronic recombination, and electron-ion bremsstrahlung. For all three elements, resonance line emission resulting from 2s?2p transitions produces a broad maximum in the energy loss rate near 105°K(~ 10 eV). 相似文献
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T. Bartsch A. Müller W. Spies J. Linkemann H. Danared D.R. DeWitt H. Gao W. Zong R. Schuch A. Wolf G.H. Dunn 《Hyperfine Interactions》1998,114(1-4):251-256
The enhancement of dielectronic recombination by applied electric fields has been observed and measured for the first time
in a wide range of controlled and measurable fields using multiply charged ions. The heavy ion storage ring, CRYRING, at Stockholm
University was used to store a beam of Si11+ and collide it with a cold electron target. The observation of a substantial monotonic increase of the rate coefficient for
the group of higher Rydberg states is in puzzling disagreement with theoretical calculations of electric field enhanced dielectronic
recombination.
This revised version was published online in July 2006 with corrections to the Cover Date. 相似文献
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Nakamura N Kavanagh AP Watanabe H Sakaue HA Li Y Kato D Currell FJ Ohtani S 《Physical review letters》2008,100(7):073203
Resonant strengths have been measured for dielectronic recombination of Li-like iodine, holmium, and bismuth using an electron beam ion trap. By observing the atomic number dependence of the state-resolved resonant strength, clear experimental evidence has been obtained that the importance of the generalized Breit interaction (GBI) effect on dielectronic recombination increases as the atomic number increases. In particular, it has been shown that the GBI effect is exceptionally strong for the recombination through the resonant state [1s2s(2)2p(1/2)](1). 相似文献
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The KLL dielectronic recombination processes of highly charged He-like to C-like Kr ions have been studied experimentally. The measurement was performed on the newly developed Shanghai electron beam ion trap (Shanghai-EBIT) facility. Characteristic x-rays from both dielectronic recombination and radiative recombination are detected as the electron beam energy is scanned through the resonances. The KLL resonant strengths obtained are 5.41×10^-19, 4.33×10^-19, 3.59×10^-19, 2.05×10^-19 and 0.98×10^-19 cm^2 eV for He-like to C-like Kr ions, respectively. 相似文献
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采用准相对论性Hartree-Fock-Relativistic方法与不可分辨跃迁组模型相结合,对Au和Ta元素的类Ni离子的双电子复合速率,以及Au元素类Cu离子的电子碰撞激发速率进行了计算。计算结果表明,对于Au类Ni离子的3d10-3d94l5f-3d104l双电子复合过程以及类Cu离子的3d104l-3d94l5f电子碰撞激发过程,当电子温度高于1.0 keV时,电子离子碰撞激发速率随电子温度增加而增加,双电子复合速率随电子温度增加而减小,并且电子碰撞激发对谱线辐射的贡献要比双电子复合大得多。 相似文献
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The power radiated by an optically thin, low-density (Ne ≤ 1014 electrons/cm3) plasma has been calculated for the electron temperature range 1–106 eV taking into account resonance line emission, direct recombination radiation, dielectronic recombination radiation, and bremsstrahlung from the ions of a given element. The ionization structure has been determined by using a corona equilibrium model in which collisional ionization and inner-shelled excitation followed by autoionization are balanced by direct radiative and dielectronic recombination. Based on the results for respresentative elements from carbon through nickel, graphs are presented of the maximum radiated power, the maximum emission temperature, and the mean charge at the maximum for each shell as functions of the atomic number Z. Assuming that the maximum emission temperature can be achieved, aluminum and iron are predicted to be the most efficient K-shell radiators for Z ≤28. 相似文献