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This content will become publicly available on February 1, 2026

Title: Fine structure transitions with spectral features in Fe V and Fe VI
This work is part of the groundwork for iron opacity calculations for solar modeling. A B S T R A C T An extensive set of E1 transitions with spectral features for Fe V obtained using relativistic Breit–Pauli R-matrix (BPRM) method is presented. The results correspond to a larger amount of atomic data and of higher accuracy in comparison to the earlier R-matrix results. We report 1,712,655 transitions among 4300 fine structure levels with 𝑗 ≤ 10, 2𝑆 + 1 = 5, 3, 1, 𝐿 ≤ 10, of even and odd parities of n ≤ 10 and 𝑙 ≤ 9. The close coupling wavefunction expansion of Fe V includes ground and 18 excited levels of the core ion Fe VI. The theoretical spectroscopy of the fine structure levels for unique identifications was carried out using an algorithm based on quantum defect theory and angular algebra. The completeness of the calculated data sets is verified for all possible bound levels belonging to the relevant 𝐿𝑆 terms. The energies are in very good agreement with measured values within a few percent for most levels. Comparison of transition parameters and lifetimes also indicate general agreement with others. The present data processed for spectral features that show the detectability of Fe V is well within range of James Webb Space Telescope and other observatories. The present results for Fe VI, obtained from relativistic atomic structure calculations in Breit–Pauli approximation using code SUPERSTRUCTURE, include allowed E1 and forbidden E2, M1, E3, M2 transitions, 506,512 in total among 1021 energy levels, bound and continuum. Calculations show much larger number of bound levels of configurations of 3𝑠23𝑝53𝑑4 than those listed at NIST compilation table. The calculations included an optimized set of 9 configurations with orbitals going up to 4f. Comparison of energies, oscillator strengths, lifetimes with available values show good agreement although some large differences are also noted. In contrast to Fe V, the spectral features of Fe VI show three regions of strong lines in the soft-xray to ultraviolet wavelengths.  more » « less
Award ID(s):
2407470
PAR ID:
10595620
Author(s) / Creator(s):
Publisher / Repository:
Elsevier
Date Published:
Journal Name:
Atomic Data and Nuclear Data Tables
Volume:
162
Issue:
C
ISSN:
0092-640X
Page Range / eLocation ID:
101700
Subject(s) / Keyword(s):
Atomic data from R-matrix method Fine structure levels and radiative transition probabilities Lifetimes Spectral features
Format(s):
Medium: X
Sponsoring Org:
National Science Foundation
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