
Author(s):
U.I. Safronova, C. Namba, I. Murakami, W.R. Johnson and M.S. Safronova

Title:
E1, E2, M1, and M2 Transitions in the Neon Isoelectronic Sequence
Date of publication:
Jan. 2001

Key words:
atomic databaseExcitation energies, oscillator strengths, transition rates

Abstract:
A relativistic manybody method is developed to calculate energy and transition rates for multipole transitions in manyelectron ions. This method is based on relativistic manybody perturbation theory (MBPT), agrees with MCDF calculations in lowestorder, includes all secondorder 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 Nelike ions with nuclear charges ranging from Z = 11 to 100. The calculations start from a 1s{^2}2s{^2}2p{^6} DiracFock potential. Firstorder perturbation theory is used to obtain intermediatecoupling coefficients, and secondorder MBPT is used to determine the matrix elements. The contributions from negativeenergy states are included in the secondorder 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

