1,720,962 research outputs found
E1, E2 and M1 transition parameters for some levels over ionization limit of Ne III
No full textWe have reported the level energies and radiative transition (E1, E2 and M1) parameters, such as wavelengths, transition rates, oscillator strengths and line strengths for some levels over the ionization limit of Ne III (oxygen-like). The calculations have been performed using the general-purpose relativistic atomic structure package (GRASP) based on the fully relativistic multiconfiguration Dirac-Fock (MCDF) method. The results obtained have been compared with the available theoretical and experimental values in the literature
E1, E2 and M1 transitions between n=3 levels in magnesium-like tungsten
No full textElectric dipole (E1) transitions of 3s-3p and 3p-3d, and electric quadrupole (E2) and magnetic dipole (M1)) transitions between fine structure levels of 3s3p and 3p(2) in Mg-like tungsten (W62+) have been studied by multiconfiguration Hartree-Fock (MCHF) method. Multielectron ions of high-Z elements are of interest in atomic structure theory. In this work Breit-Pauli relativistic contributions and correlation effects have been considered. The magnesium-like tungsten lines obtained from this work are compared with other theoretical and experimental results
Energies and Radiative Transition Parameters for Mg-Like Tungsten
No full textBy applying AUTOSTRUCTURE code, the energies and transitions for allowed (El) and forbidden (E2, M1, and M2) lines for low-lying configurations in magnesium-like tungsten (W62+) are studied. The electron correlation and relativistic effects are included in computations. Good agreement between our results and available other results are found. The data for E2, M1 and M2 besides some El transitions for low-lying levels are presented for the first time
Electric dipole transitions for 3d(6)4s-3d(6)4p in Mn I
No full textWe have calculated the logarithmic weighted oscillator strengths and transition probabilities (or rates) for 3d(6)4s-3d(6)4p electric dipole transitions in neutral manganese (Mn I, Z=25) by using two configuration interaction methods (the multiconfiguration Hartree-Fock (MCHF) method within the framework of Breit-Pauli relativistic corrections developed by Fischer and Cowan's relativistic Hartree-Fock (HFR) method). Results obtained have been compared with other calculations and experiments. (C) 2015 Elsevier Ltd. All rights reserved
M1 and E2 transitions in the ground-state configuration of atomic manganese
No full textUsing the multiconfiguration Hartree-Fock approximation within the framework of the Breit-Pauli Hamiltonian (MCHF+BP) and the relativistic Hartree-Fock (HFR) approximation, we have calculated the forbidden transition (M1 and E2) parameters such as transition energies, logarithmic weighted oscillator strengths and transition probabilities between the fine-structure levels in the ground-state configuration of 3d(5)4s(2) for atomic manganese (Mn I, Z=25). A discussion of these calculations for manganese using MCHF+BP and HFR methods is given here
Energies and Lifetimes of Levels for Doubly Ionized Xenon and Radon
Full text linkWe have reported the energies and radiative lifetimes of levels for doubly ionized xenon (Xe III) and radon (Rn III). The calculations have been performed using the general-purpose relativistic atomic structure package based on fully relativistic multiconfiguration Dirac-Fock method. We have compared the results obtained from this work for (Xe III) with previous works in available literature. For (Rn III), there is no data except a few energy levels. Hence, we have presented new values on the energy levels of (Rn III)
Electric dipole transitions between low-lying levels in doubly ionized krypton, xenon, and radon
Full text linkUsing the general-purpose relativistic atomic structure package (GRASP) based on a fully relativistic multiconfiguration Dirac-Fock (MCDF) method, the transition parameters, such as transition rates (probabilities), oscillator strengths, and line strengths for the electric dipole transitions between low-lying levels are evaluated for doubly ionized krypton, xenon, and radon. Breit interactions for relativistic effects and quantum electrodynamical (QED) contributions besides valence and valence-core correlation effects are taken into account in calculations. We compare the results obtained with the available data in the literature and discuss them, when possible
Electric Dipole Transition Parameters for 5s-5p and 5p-5d Transitions in Doubly Ionized Xenon
No full textUsing the general-purpose relativistic atomic structure package based on the fully relativistic multiconfiguration Dirac-Fock method, we have reported the electric dipole transition (E1) parameters such as wavelengths, weighted oscillator strengths, transition rates (or probabilities) and line strengths for 5s-5p and 5p-5d transitions in Xe2+. In calculations, the Breit interaction and quantum electrodynamic effects have been included as perturbations. The calculated values for energy levels including valence and core-valence correlation have been compared with other available experimental and theoretical values in literature. Our transition results can provide useful data for, in particular, experimental works in future
Going Beyond Counting First Authors in Author Co-citation Analysis
Full text linkThe present study examines one of the fundamental aspects of author co-citation analysis (ACA) - the way co-citation
counts are defined. Co-citation counting provides the data on which all subsequent statistical analyses and mappings
are based, and we compare ACA results based on two different types of co-citation counting - the traditional type that
only counts the first one among a cited work's authors on the one hand and a non-traditional type that takes into
account the first 5 authors of a cited work on the other hand. Results indicate that the picture produced through this non-traditional author co-citation counting contains more coherent author groups and is therefore considerably clearer. However, this picture represents fewer specialties in the research field being studied than that produced through the traditional first-author co-citation counting when the same number of top-ranked authors is selected and analyzed. Reasons for these effects are discussed
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