Multiconfiguration Dirac-Hartree-Fock energy levels and transition probabilities for 3d^5 in Fe IV

TL;DR

This paper presents detailed multiconfiguration Dirac-Hartree-Fock calculations of energy levels and transition probabilities for 3d^5 in Fe IV, improving accuracy and comparing with previous methods.

Contribution

It provides new ab initio energy levels and transition probabilities for Fe IV's 3d^5 configuration, with comprehensive accuracy indicators and comparisons to prior results.

Findings

Accurate E2 and M1 transition probabilities reported.

Good agreement between length and velocity forms of line strength.

Comparison shows improvements over Breit-Pauli results.

Abstract

Multiconfiguration Dirac-Hartree-Fock electric quadrupole (E2) and magnetic dipole (M1) transition probabilities are reported for transitions between levels of 3d^5 in [Fe IV]. The accuracy of the ab initio energy levels and the agreement in the length and velocity forms of the line strength for the E2 transitions are used as indicators of accuracy. The present E2 and M1 transition probabilities are compared with earlier Breit-Pauli results and other theories. An extensive set of transition probabilites with indicators of accuracy are reported in Appendices A and B. Recommended values of A(E2) + A(M1) are listed in Appendix C.