共查询到20条相似文献,搜索用时 0 毫秒
1.
电子关联效应在负离子中的作用相当重要,本文讨论了负碳离子(2s^22p^2)和(2s^12p^4)的能级结构、光谱跃迁、寿命和光离解通道等。碳负离子(1s^22s^1p^4)的双重态比四重态稳定,(2s^22p^4)和(2s^12p^4)之间各辐射谱线波长位于超紫外区域的上限附近,其光谱强度很大的波长有6条,为研制X射线激光提供了有利的工作物质。 相似文献
2.
Ion impact excited spectra of Ne contain a line at 52.82 nm which has been identified as resulting from the decay of double 2s vacancies in NeIII via the transition 2s02p6(1S0)?2s12p5(1P1). 相似文献
3.
Chenzhong Dong 《Chinese Journal of Lasers》1993,2(5):435-439
The available experimental energies for the 4s~24p~3 and 4s~4p~4 configurations in As Ⅰ—like Sr Ⅵ—Ag Ⅹ Ⅴions are compared with the values calculated using the Hartree—Fock method including configuration interaction and relativistic corrections. Some energy values of the 4s~24p~3 configuration in Rh Ⅹ Ⅲ、Pd Ⅹ Ⅳ and Ag Ⅹ Ⅴ ions are improved and all the energies、wavelengths and transition probabilities of the 4s~24p~3—4s4p~4 transition array in Cd Ⅹ Ⅵ are presented. 相似文献
4.
Beam-foil lifetimes have been measured for the partially resolved multiplet components of the 2s22p43P-2s253P0 transition (792 Å) in 0 I. Our lifetime results indicate that either autoionization rate is more important than reported previously or theoretical optical f-values are too small by a factor of two. 相似文献
5.
The radiative lifetimes of the 6p2P levels in Hg(II) have been measured to be ns and ns by the beam-gas-Hanle and the beam-foil techniques, respectively. The result for the level differs from recent theoretical calculations, whereas there is good agreement for the level. 相似文献
6.
Radiative lifetimes of the Li II levels 31P, 41P and 51P are extracted from the observed vacuum-UV-transitions 31P → 21S, 41P → 21S, and 51P → 21S, respectively. The measured values agree well with theory. 相似文献
7.
Influence of relaxation effects on probabilities of the 2s2p35S2-2s22p2 3P1,2 intercombination transitions in NII 下载免费PDF全文
Transition probabilities of the 2s2p^3 {}^5S_2-2s^22p^2 {}^3P_{1,2} intercombination transitions in NII have been calculated by using a large-scale multiconfiguration Dirac-Fock method. In the calculation the most important effects of relativity, correlation, and relaxation are considered. From the calculated transition probabilities, the lifetime of the 2s2p^3 {}^5S_2 metastable state is derived. The result is in excellent agreement with the latest experimental result. In the meantime the influence of anomalously strong relaxation effects on probabilities of the 2s2p^3 {}^5S_2-2s^22p^2 {}^3P_{1,2} lines in NII have been found. 相似文献
8.
Spectra and oscillator strengths of 3p63d9--3p53d10 and 3p63d9--3p63d84p transitions for cobalt-like Sn23+ ion 下载免费PDF全文
This paper calculates the spectra and oscillator strengths for highly ionized cobalt-like Sn23+ ions 3p63d9 3p53d10,3p63d9 3p63d84p transitions by using a multi-configuration self-consistent field method program together with the proposed fitting formula.The calculations have a good agreement with observations. 相似文献
9.
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)4p2F7/2–3d9 (2D)4s2 2D5/2 的跃迁谱线, 而不属于3d94s (1D)4p4D7/2–3d9(2D)4s2 2D5/2 的跃迁谱线, 即上谱项能级为2F7/2, 而不是4D7/2.
关键词:
Nb XIII离子
二电子激发组态
谱线波长
跃迁概率 相似文献
10.
M.J.G. Borge J. Campos 《Journal of Quantitative Spectroscopy & Radiative Transfer》1980,24(4):263-268
The lifetimes of nine levels of Ar(I) belonging to the 3p54p configuration have been measured by the delayed coincidence method, with errors in the range from 4 to 7%. The results are compared with other experimental values and with theoretical calculations using jK coupling and intermediate coupling. From cascade components of the 4p levels, decay lifetime values for some levels belonging to the 3p53d and 3p55s configurations have been inferred. 相似文献
11.
V.V. Balashov A.N. Grum-Grzhimailo N.M. Kabachnik A.I. Magunov S.I. Strakhova 《Physics letters. A》1978,67(4):266-268
The triple differential cross section for excitation of the 3s?1 4p 1P autoionizing state in argon is calculated. 相似文献
12.
Reconciliation of Theoretical Lifetimes of the 5s5p3P2o Metastable State for 88Sr with Measurement: The Role of the Blackbody-Radiation-Induced Decay 下载免费PDF全文
We conducted measurement and calculation to resolve the long-standing large discrepancy in the metastable state lifetime for the 88Sr atom between theoretical and experimental results. The present lifetime τ = 830-240+600s,measured using the magneto-optical trap as a photon amplifier to detect the weak decay events, is approximately60% larger than the previous experimental value τ = 520-140+310s. By considering the electron correlation effec... 相似文献
13.
In this paper, the triple differential cross section for the low-energy electron impact ionization of the Li+ ion is considered in the coplanar equal energy-sharing kinematics at an incident energy of 114.083 eV. The emergence of structures in the calculated cross sections is explained in terms of isolated two-body final-state interactions and three-body coupling. The cross section shows two peaks originating from ′classical′ is determined by two-body final-state interactions. In addition, it is demonstrated that the signature of three-body interactions is carried by the magnitude and ratio of these two peaks. The direct and exchange amplitudes are also considered. 相似文献
14.
The transition energies, wavelengths and dipole oscillator strengths of 1s^22p-1s^2nd (3 ≤ n ≤ 9) for Cr^21+ ion are calculated. The fine structure splittings of 1s^2nd (n ≤ 9) states for this ion are also calculated. In calculating energy, we have estimated the higher-order relativistic contribution under a hydrogenic approximation. The quantum defect of Rydberg series 1s^2nd is determined according to the quantum defect theory. The results obtained in this paper excellently agree with the experimental data available in the literature. Combining the quantum defect theory with the discrete oscillator strengths, the discrete oscillator strengths for the transitions from initial state 1s^22p to highly excited 1s^2nd states (n ≥ 10) and the oscillator strength density corresponding to the bound-free transitions are obtained. 相似文献
15.
F.E.H. Van Eijkern G. Van Middelkoop W.A. Sterrenburg A.F.C. Buijense 《Nuclear Physics A》1976,260(1):124-140
Spins, parities and transition probabilities of levels in 32P at Ex > 3.5 MeV have been determined with the 29Si(α, pγ)32P reaction at bombarding energies of Eα = 12.80, 12.93 and 16.30 MeV. Proton-gamma angular correlation experiments and DSA lifetime measurements lead to six unambiguous spin assignments and to many spin limitations. The measured mixing and branching ratios yield many transition strengths for dipole and electric quadrupole transitions. Five, sofar unknown, energy levels are reported. A doublet at 4.03 MeV excitation energy and a high-spin state (Ex = 4.27 MeV; Jπ = 5?) were observed. Shell-model predictions have been compared to the present experimental results. 相似文献
16.
17.
Transition probabilities for NII 2p4f-2p3d and 2s2p^23d-2s2p^23p obtained by a semiclassical method 下载免费PDF全文
Based on NII spectra, some transition probabilities for 2p4f--2p3d
and 2s2p$^2$3d--2s2p$^2$3p are obtained by a semiclassical method.
The results are in good agreement with other measurements and the
data reported by the National Institute of Standards and Technology.
The transition probability for a line of 424.18nm is reported for the
first time. Meanwhile, a feasible method of calculating transition
parameters related to special excited configurations or highly
excited states is provided. 相似文献
18.
M Wilson 《Physics letters. A》1985,111(7):363-366
An initio calculations of the positions and widths of the 6p2 autoionizing levels of Hg I are presented together with comparison calculations for the energies of the 6p2 levels in Tl II and Pb III. 相似文献
19.
Non-relativistic energies of 1s22s and 1s2
np (n⩽9) states for Co24+ ion are calculated by using the full-core plus correlation method. Our results of 1s22s and 1s22p states agree well with the high-precision results of Yan et al. Based on calculating the first-order corrections to the
energy from relativistic and mass-polarization effects, we estimate the higher-order relativistic contribution and QED correction
to the energy under a hydrogenic approximation. The transition energies, wavelengths and oscillator strengths for the 1s22s−1s2
np (n⩽9) transitions of this ion are calculated. The results agree with the experimental data available in literature satisfactorily.
By combining with quantum defect theory, our theoretical predictions on the energy and oscillator strength of this ion are
extrapolated to the whole energy region including continuous states. 相似文献