Atomic data from the Iron Project XLV. Relativistic transition probabilities for carbon-like Ar XIII and Fe XXI using Breit-Pauli R-matrix method
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Date
2000-12-01
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Abstract
The Breit-Pauli R-matrix method developed
under the Iron Project has been used to obtain extensive sets of oscillator strengths and transition probabilities
for dipole allowed and intercombination fine structure transitions in carbon like ions, Ar XIII and Fe XXI. The complete set consists of 1274 fine structure bound
energy levels and 198 259 oscillator strengths for Ar XIII, and 1611 bound levels and 300 079 oscillator strengths for
Fe XXI. These correspond to levels of total angular momenta of 0 ≤ J ≤ 7 of even and odd parities formed from total spin of 2S + 1 = 5, 3, 1, and orbital angular momenta
0 ≤ L ≤ 9 with n ≤ 10, 0 ≤ l ≤ 9 for each ion. The relativistic effects are included in the Breit-Pauli approximation. The close coupling wavefunction expansion for each ion is represented by the lowest 15 fine structure levels of target configurations, 2s^2 2p, 2s2p^2 and 2p^3. The energy levels are identified spectroscopically using a
newly developed identification procedure. The procedure also makes a correspondence between the fine structure energy levels and LS terms. This provides the check for
completeness of the calculated levels. Comparison is made of the present energies and the f-values with the available
observed and theoretical values. Present transition probabilities agree very well with the relativistic atomic structure calculations of Mendoza et al. for the intercombination transitions, 2s2p^3( ^5 S°_2
)− 2s^2 2p^2(^3 P_1,2, ^1 D_2). This
further indicates that the importance of the neglected Breit interaction decreases with ion charge and constrains the uncertainty in the present calculations to within 15%
even for the weak transitions.
Description
Relevant data is available at: http://www.astronomy.ohio-state.edu/~nahar/nahar_radiativeatomicdata/index.html
Keywords
atomic data
Citation
Nahar, Sultana Nurun. "Atomic data from the Iron Project XLV. Relativistic transition probabilities for carbon-like Ar XIII and Fe XXI using Breit-Pauli R-matrix method," Astronomy & Astrophysics Supplement Series, v. 147, 2000, pp. 253-270.