Energy levels and transition probabilities for Fe XI

Abstract EN

Theoretical calculations of transition energies, electric dipole oscillator strengths and transition probabilities for the Fe XI ion are presented.

These calculations are based on the relativistic Hartree-plus statistical exchange model using Cowan's program.

The data represents the 48 fine-structure levels belonging to the configurations (Is2 2s2 2p6) 3s 23p4, 3p6, 3s' 3ps, 3s23p33d1.

Comparison with different theoretical models is made.

The average percentage difference between the theoretical calculations and the experimental results for the energy levels is 3.4 %.

For the dipole oscillator strengths and the transition probabilities, the agreement between the different models for strong lines is very good while the difference between the models for the weaker lines vary up to 50 %.

The 3p6 configuration has a strong effect on the lower levels while the configurations that include excitations to n= 5 and 6 are not important to the lower levels under study.