Ab initioCalculation of Electric Quadrupole and Magnetic Dipole Transitions in Ions of the N I Isoelectronic Sequence

Abstract

The electric quadrupole (E2) and magnetic dipole (M1) transitions in the nitrogen isoelectronic sequence (Z \ 10È30) between the levels of the 1s22s22p3, 1s22s2p4 and 1s22p5 conÐgurations are investigated. The results include wavelengths and radiative E2 and M1 transition probabilities. The stationary second-order many-body perturbation theory (MBPT) was used to account for the electron correlations. A non-local potential was used to calculate the radial part of the e †ective Hamiltonian. Relativistic corrections were included in the BreitÈPauli approximation. The lowest-order correlation corrections to the one-body part of the spinÈorbit interaction operator were also included.

Chianti—an Atomic Database for Emission Lines. Xii. Version 7 of the Database

“…The fits now reproduce the original data to within 0.90% over the temperature range 4.0 × 10 3 to 7.9 × 10 5 K. The radiative decay rates in the previous CHIANTI model were from an unpublished calculation by the CHIANTI team (Landi et al 1999) carried out with SUPERSTRUCTURE (Eissner et al 1974), and the forbidden transition rates have now been replaced with the values from Merkelis et al (1999). Differences between the old CHIANTI A values and the Merkelis et al (1999) ones are within 30%, with only one exception ( 2 D 3/2 -2 P 3/2 ) having a difference of 40%. In addition the Ne iv experimental energy values have been replaced with the values from Kramida et al (1999).…”

Extended calculations of level and transition properties in the nitrogen isoelectronic sequence: Cr XVIII, Fe XX, Ni XXII, and Zn XXIV

“…(a) Kramida et al (2013); (b) present calculations; (c) Rynkun et al (2014); (d) Jonauskas et al (2005); (e) Nahar (2004); ( f ) Merkelis et al (1997Merkelis et al ( , 1999.…”

“…Vilkas & Ishikawa (1998) did calculations in the framework of the relativistic multireference Møller-Plesset perturbation theory (MRMP) of energy levels and transition probabilities for a number of ions in the sequence. Merkelis et al used the second-order many-body perturbation theory (MBPT) with relativistic corrections in the Breit-Pauli approximation to compute oscillator strengths between the levels of the 2s 2 2p 3 , 2s2p 4 , and 2p 5 configurations (Merkelis et al 1997) and between the levels of the 2s 2 2p 3 configuration (Merkelis et al 1999). Ions in the range Z = 10, .…”

Irreducible tensor form of the relativistic corrections to the M1 transition operator

“…The many-body perturbation theory (MBPT) was used to account for the electron correlation, including relativistic corrections in the Breit-Pauli approximation for evaluating E2 and M1 transition rates along the N I isoelectronic sequence [82]. As far as M1 transition amplitudes are concerned, for all these Breit-Pauli calculations whatever the method used for obtaining the zero-order non-relativistic wave functions (variational MCHF, MBPT, CI, .…”