Fine-structure calculations of energy levels, oscillator strengths, and transition probabilities for sulfur-like iron, Fe XI

Journal Article · Thu May 15 04:00:00 EDT 2014 · Atomic Data and Nuclear Data Tables

DOI:https://doi.org/10.1016/J.ADT.2013.05.005· OSTI ID:22314844

Ahmad, Mahmoud ^[1]; Allam, S. H. ^[2]

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1. Physics Department, Faculty of Science, Al-Azhar University, Assuit (Egypt)
2. Laboratory of Lasers and New Materials, Physics Department, Faculty of Science, Cairo University, Giza (Egypt)

Energy levels, oscillator strengths, and transition probabilities for transitions among the 14 LS states belonging to configurations of sulfur-like iron, Fe XI, have been calculated. These states are represented by configuration interaction wavefunctions and have configurations 3s{sup 2}3p{sup 4}, 3s3p{sup 5}, 3s{sup 2}3p{sup 3}3d, 3s{sup 2}3p{sup 3}4s, 3s{sup 2}3p{sup 3}4p, and 3s{sup 2}3p{sup 3}4d, which give rise to 123 fine-structure energy levels. Extensive configuration interaction calculations using the CIV3 code have been performed. To assess the importance of relativistic effects, the intermediate coupling scheme by means of the Breit–Pauli Hamiltonian terms, such as the one-body mass correction and Darwin term, and spin–orbit, spin–other-orbit, and spin–spin corrections, are incorporated within the code. These incorporations adjusted the energy levels, therefore the calculated values are close to the available experimental data. Comparisons between the present calculated energy levels as well as oscillator strengths and both experimental and theoretical data have been performed. Our results show good agreement with earlier works, and they might be useful in thermonuclear fusion research and astrophysical applications. -- Highlights: •Accurate atomic data of iron ions are needed for identification of solar corona. •Extensive configuration interaction wavefunctions including 123 fine-structure levels have been calculated. •The relativistic effects by means of the Breit–Pauli Hamiltonian terms are incorporated. •This incorporation adjusts the energy levels, therefore the calculated values are close to experimental values.

• OSTI ID: 22314844
• Journal Information: Atomic Data and Nuclear Data Tables, Journal Name: Atomic Data and Nuclear Data Tables Journal Issue: 3 Vol. 100; ISSN ADNDAT; ISSN 0092-640X
• Country of Publication: United States
• Language: English

Related Subjects

74 ATOMIC AND MOLECULAR PHYSICS
ASTROPHYSICS
COMPARATIVE EVALUATIONS
CONFIGURATION INTERACTION
CORRECTIONS
ENERGY LEVELS
FINE STRUCTURE
HAMILTONIANS
INTERMEDIATE COUPLING
IRON IONS
MULTICHARGED IONS
ORBITS
OSCILLATOR STRENGTHS
PROBABILITY
RELATIVISTIC RANGE
SOLAR CORONA
SPIN
WAVE FUNCTIONS