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Author(s):
U.I. Safronova, C. Namba, I. Murakami, W.R. Johnson and M.S. Safronova
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Title:
E1, E2, M1, and M2 Transitions in the Neon Isoelectronic Sequence
Date of publication:
Jan. 2001
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Key words:
atomic database-Excitation energies, oscillator strengths, transition rates
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Abstract:
A relativistic many-body method is developed to calculate energy and transition rates for multipole transitions in many-electron ions. This method is based on relativistic many-body perturbation theory (MBPT), agrees with MCDF calculations in lowest-order, includes all second-order correlation corrections, includes corrections from negative energy states, and is gauge independent. Reduced matrix elements, oscillator strengths, and transition rates are calculated for electric dipole (E1) and quadrupole (E2) transitions and magnetic dipole (M1) and quadrupole (M2) transitions in Ne-like ions with nuclear charges ranging from Z = 11 to 100. The calculations start from a 1s{^2}2s{^2}2p{^6} Dirac-Fock potential. First-order perturbation theory is used to obtain intermediate-coupling coefficients, and second-order MBPT is used to determine the matrix elements. The contributions from negative-energy states are included in the second-order E1, M1, E2 and M2 matrix elements. The resulting transition energies and transition rates are compared with experimental values and with results from other recent calculations
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