Oscillator strengths for singly ionized oxygen

The electric dipole oscillator strengths for multiplet and individual lines between some doublet and quartet levels have been calculated using the weakest bound electron potential model theory (WBEPMT) in singly ionized oxygen. We employed both numerical Coulomb approximation (NCA) wave functions and numerical non-relativistic Hartree-Fock (NRHF) wave functions for expectation values of radii in determination of parameters. The calculated oscillator strengths have been compared with available theoretical and experimental results. A good agreement with results in literature has been obtained. Moreover, oscillator strengths not existing in the literature for some highly excited levels have been obtained using this method. Electronic supplementary material  Supplementary Online Material     

Electric dipole transitions for La I (Z=57)

Wavelengths, weighted oscillator strengths and transition probabilities for electric dipole (E1) transitions for some excited levels in neutral lanthanum (La I, Z=57) have been calculated using the multiconfiguration Hartree-Fock (MCHF) method within the framework of Breit-Pauli relativistic corrections. Results obtained have been compared with other calculations and experiments. A discussion of these calculations for La I in this study has also been given in view of the MCHF method.     

Relativistic energies and transition probabilities for some highly excited levels in singly ionized indium

For some excited levels (n?8), the energies, wavelengths, oscillator strengths and transition probabilities calculations in singly ionized indium have been calculated within the framework of multiconfiguration Hartree-Fock approximation with relativistic corrections (Breit-Pauli Hamiltonian). The wavefunctions and some relativistic corrections have been obtained using MCHF-BP atomic package. Comparisons with other calculations and experiments are presented.     

Au激光等离子体M带5f-3d跃迁的光谱参数

用超组态碰撞辐射模型模拟非局域热动力学平衡中Au的M带谱5f-3d跃迁的离子电离态特性，激光等离子体的光谱跃迂参数是必不可少的。利用多组态Dirac-Fock广义扩展平均能级方法，用GRASP^2系统地计算了激光Au等离子体中类铁金离子-类锗金离子的M带谱5f-3d的光谱跃迁波长．跃迁几率和振子强度，计算中考虑了重要的核的有限体积效应、Breit修正和QED修正，所得结果和最近的实验数据及理论计算值进行了比较。此结果可应用于对激光等离子体的模拟和诊断。     

高离化态类Ne离子的与X射线激光有关的3p-3s跃迁的理论研究

利用多组态Dirac-Fock(MCDF)理论方法,系统研究了与X射线激光有关的类Ne等电子系列离子(Z=50～57)的2s22p6、2s22p53e和2s2p63e(e=s、p、d)激发态的能级以及跃迁几率、波长和振子强度.详细讨论了关联效应对与X射线激光有关的能级寿命以及跃迁几率的影响,给出并分析了与x射线激光有关的3p-3s跃迁的波长,几率和振子强度的变化规律,部分计算结果与已有的理论和实验结果作了比较.     

Transition energies of neutral and singly ionized lanthanum

We have calculated the transition energies (ionization potential, excitation energies, electron affinity) of neutral lanthanum (La I) and singly ionized lanthanum (La II). The calculations are based upon the multiconfiguration Hartree-Fock (MCHF) method within the framework of Breit-Pauli relativistic corrections. These energies are important for determination of physical and chemical properties for La I and La II. Results obtained have been compared with other works.     

Radiative transitions in highly ionised silicon-like ions

Transition energies, oscillator strengths and transition probability values for radiative transitions have been calculated for the highly ionised atoms of Si isoelectronic sequence from Mn¹¹⁺ to Kr²²⁺ for the singly excited states up to principal quantum number n = 7. Time-dependent coupled Hartree-Fock (TDCHF) theory has been used to estimate such transition properties. Most of the results for the oscillator strengths and transition probabilities are new. Transition energies agree reasonably well with available spectroscopic values. Received 25 January 2000 and Received in final form 24 October 2000     

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Using the fully relativistic configuration interaction (RCI) method and the multi-configuration Dirac-Fock (MCDF) method and taking quantum electrodynamical (QED) effect and Breit correction into account, wavelengths, transition probabilities and oscillator strengths were calculated for electric dipole (E1) transitions and magnetic dipole (M1) transitions in Au⁵⁰⁺ ion. The obtained energy levels of some excited states and wavelengths of transitions in Au⁵⁰⁺ ion from the method were compared with other theoretical and experimental results, and a good agreement with other results was shown. The calculated transition probabilities and oscillator strengths in E1 transitions using the velocity and length gauges respectively confirmed the accuracy of our calculations. The calculation results indicated that for high-Z highly ionized atom, some forbidden transitions could be very important.     

Systematic multi-configuration Dirac-Fock calculations of the Kα and Kβ X-ray spectra of silicon ions

The transition energies, absorption oscillator strengths, line strengths and transition probabilities between computed levels are reported for the He-like to Ne-like Silicon ion sequences. Wavefunctions were determined relativistic configuration interaction (RCI) and multi-configuration Dirac-Fock (MCDF) technique included the Breit interaction, quantum electrodynamic (QED) corrections and nuclear mass corrections. The calculated values are in good agreement with the available experimental data and the recent theoretical values obtained from other methods. These data provide reference values for the level lifetimes, charge state distributions, and average charge of silicon plasmas.     

Radiative lifetime measurements and oscillator strength determination for transitions in singly ionized praseodymium (Pr II)

New radiative lifetimes for 20 levels of Pr II have been measured using the time-resolved laser-induced fluorescence (LIF) technique. The combination of these experimental values with theoretical branching fractions (BF) obtained with the pseudo-relativistic Hartree-Fock (HFR) approach has allowed us to determine oscillator strengths and transition probabilities for about 150 lines appearing in the spectral region between 369.9 and 741.2 nm. A detailed discussion of our new results and comparisons with previous data are also given in the present paper.Received: 26 March 2003, Published online: 29 July 2003PACS: 32.70.Cs Oscillator strengths, lifetimes, transition moments - 42.62.Fi Laser spectroscopy     

Lifetime measurements and transition probability calculations in singly ionized tungsten (W<Subscript>II</Subscript>)

New measurements of radiative lifetimes for 9 levels in singly ionized tungsten (W_II) have been performed with the time-resolved laser-induced-fluorescence technique. Transition probabilities have been obtained from a combination of experimental lifetimes and theoretical branching fractions. The reliability of the present results is assessed through the good agreement observed between the calculated lifetimes and the experimental values from this work and from previous publications. These new results fill in a gap in the available data for this atomic species particularly important for fusion reactors.     

Relativistic configuration interaction calculations on Kα X-ray satellites of magnesium ions

In this work, the multi-configuration Dirac-Fock (MCDF) and relativistic configuration interaction (RCI) methods have been used to calculate the transition wavelengths, electric dipole transition probabilities, line strengths and absorption oscillator strengths for the Kα X-ray from Mg III to Mg XI. We also take the contributions from the Breit interaction, finite nuclear mass corrections and quantum electrodynamics corrections to the initial and final levels, into account. The present values for Mg X and Mg XI were in good agreement with the previous experimental and theoretical results. The new data in this work provide reference values for the level lifetimes, charge state distributions, and average charge of magnesium plasmas.     

Properties of the Kα X-ray transitions in highly ionized cobalt

Multi-Configuration Dirac–Fock and relativistic configuration interaction calculations with the inclusion of the Breit interaction, quantum electrodynamics and finite nuclear mass corrections have been carried out in the extended optimal level (EOL) scheme on the transition wavelengths, transition probabilities, absorption oscillator strengths and line strengths of the Kα X-ray from Co XIIX to Co XXVI. The calculated values are compared with the other available data on He-like to Be-like cobalt and are found to be in very good agreement with them. This confirms the present calculations. These data provide reference values for level lifetimes, charge state distribution and average charge of cobalt plasmas.     

Ion charge state distributions following K-shell ionization in atoms

Ion charge state distributions and the mean charge state following K-shell ionization in atoms are calculated. The Monte Carlo method is applied to calculate the vacancy cascades after K-shell vacancy creation. The radiative and non-radiative transitions are calculated for singly ionized atoms. The transition rates for multi-ionized atoms are obtained using a statistical scaling procedure based on the transition probabilities for singly ionized atoms. The electron shake-off process due to the change of atomic potential, which occurs from core hole production and de-excitation decays, is considered in the calculation. The present results agree well with the available experimental values.     

Systematic trends in atomic transition probabilities in neutral and singly-ionized zinc,cadmium and mercury

The beam-foil technique has been used to measure mean lives of excited levels in neutral and singly ionized zinc, cadmium, and mercury. In the neutral atoms, the lifetimes measured were in good agreement with those obtained by the Hanle-effect and phase-shift techniques, but discrepancies were found in some of the life-times measured by the delayed-coincidence method. For singly ionized zinc and cadmium, six mean lives have been measured, while seven were obtained in singly ionized mercury. For the ionized species, systematic trends show that some of the results recently obtained by the phase-shift method may be in error. The mean lives reported were converted to ; values for transitions for which reliable multiplet intensity ratios are available. The ; value systematics show that for the same type of spectral transition, identical ; values have been obtained within homologous atoms.     

单电离态Kr原子强跃迁能级振子强度的研究

阐述了用束-箔方法通过测量单电离态Kr原子强跃迁谱线的能级寿命来 确定振子强度f-值的方法,并对确定出的强跃迁谱线的能级吸收振子强度进行简要讨 论。     

金等离子体中Au51+能级寿命的相对论多组态计算

根据扩展的相对论多组态 Dirac-Fock理论,采用"多功能相对论原子结构程序(Grasp2) ",选用二参数Fermi有限核模型计算类镍Au51+ 的能级寿命和能级宽度及光谱跃迁波长、跃迁几率和振子强度,计算所得波长值与实验值符合得很好,能级寿命与能级宽度的大小关系符合海森堡的能量与时间测不准原理.     

Energy Levels and Transition Rates for Ti XIV

Physics of Particles and Nuclei Letters - Energy levels, wavelengths, oscillator strengths, transition probabilities, line strengths, and lifetimes are calculated for transitions in Ti XIV. The...     

Transitions in the fourth spectrum of nitrogen

Configuration interaction wavefunctions are used to calculate energy levels, wavelengths, oscillator strengths (length and velocity forms), transition probabilities and lifetimes for transitions in the fourth spectrum of nitrogen. Comparison with recent beam-foil experimental data is generally good. Some significant differences from previous calculations are obtained.     

Transition probabilities in Kr II and Kr III spectra

On the basis of the relative line intensity ratio (RLIR) method, transition probability values of the spontaneous emission (Einsteins A values) of 14 transitions in the singly (Kr II) and 7 transitions in doubly (Kr III) ionized krypton spectra have been obtained relatively to the reference A values related to the 435.548 nm Kr II and 324.569 nm Kr III, the most intensive transitions in the Kr II and Kr III spectra. Our Kr III transition probability values are the first data obtained experimentally using the RLIR method. A linear, low-pressure, pulsed arc operated in krypton discharge was used as an optically thin plasma source at a 17 000 K electron temperature and 1.65 x 10²³ m^-3 electron density. Our experimental relative A values are compared with previous experimental and theoretical data.Received: 16 June 2003, Published online: 16 September 2003PACS: 52.70.Kz Optical (ultraviolet, visible, infrared) measurements - 32.70.Cs Oscillator strengths, lifetimes, transition moments - 32.70.Fw Absolute and relative intensities