Calculated Level Energies, Transition Probabilities, and Lifetimes of Silicon-Like Ions

Radiative data for Fe XIII

“…Excellent agreement is found between the SSTRUCT, Fawcett (1987) and Kohstall et al (1998) data-sets, with the majority of points in Figs. 1b and c lying within ±30%.…”

“…Träbert et al (2003) have determined a lifetime of 9.0±0.4 ms for the metastable 3 F 4 level which compares with the value 8.56 ms derived from the present calculations. The Kohstall et al (1998) calculations yield a lifetime of 9.17 ms.…”

“…Huang (1985) and Kohstall et al (1998) both constructed wavefunctions through the multiconfiguration Dirac-Fock method, where states are represented by a linear combination of configuration state functions, with states divided into groups according to the J value and parity with optimisation performed on each group separately up to J = 2 (even) and J = 4 (odd). Huang (1985) used the code of Desclaux (1975), and included only n = 3 configurations, while Kohstall et al (1998) used the GRASP92 code (Parpia et al 1996) and included n = 4 and n = 5 configurations in addition to n = 3. Fawcett (1987) calculated oscillator strengths through optimizing Slater parameters calculated with a Hartree-Fock-Relativistic program package.…”

“…1 the A-values for the allowed transitions amongst the 3s 2 3p 2 , 3s3p 3 and 3s 2 3p3d configurations from the Huang (1985), Fawcett (1987), Kohstall et al (1998) and Nahar (1999) and CHIANTI calculations are compared with the current SSTRUCT model. In each plot the X-axis gives the radiative decay rate from Table 6 while the Y-axis gives the ratio of the decay rate from the appropriate calculation to that of the present calculation.…”

“…The λ359.64 line is seen in solar spectra, but no emission line is detected at 372.0 Å in high resolution solar spectra (Thomas & Neupert 1994), consistent with the much smaller ratio found from the SSTRUCT model. The three lines arising from decay of level 23 to the ground 3 P levels Huang (1985), b) Fawcett (1987), c) Kohstall et al (1998), d) Nahar (1999), and e) the CHIANTI model. For each transition for which there exist A values from both calculations, the SSTRUCT A value is plotted against the ratio of the A values from the two calculations.…”