Atomic data from the Iron Project LIII. Relativistic allowed and forbidden transition probabilities for Fe XVII
Loading...
Date
2003-09
Journal Title
Journal ISSN
Volume Title
Publisher
Abstract
An extensive set of fine structure levels and corresponding transition probabilities for allowed and forbidden transitions
in Fe XVII is presented. A total of 490 bound energy levels of Fe XVII of total angular momenta 0 ≤ J ≤ 7 of even and odd parities with 2 ≤ n ≤ 10, 0 ≤ l ≤ 8, 0 ≤ L ≤ 8, and singlet and triplet multiplicities, are obtained. They translate to over 2.6 x 10^4 allowed (E1) transitions that are of dipole and intercombination type, and 2312 forbidden transitions that include
electric quadrupole (E2), magnetic dipole (M1), electric octopole (E3), and magnetic quadrupole (M2) type representing the
most detailed calculations to date for the ion. Oscillator strengths f, line strengths S, and coefficients A of spontaneous emission
for the E1 type transitions are obtained in the relativistic Breit-Pauli R-matrix approximation. A-values for the forbidden
transitions are obtained from atomic structure calculations using codes SUPERSTRUCTURE and GRASP. The energy levels
are identified in spectroscopic notation with the help of a newly developed level identification algorithm. Nearly all 52 spectroscopically observed levels have been identified, their binding energies agreeing within 1% with our calculation. Computed
transition probabilities are compared with other calculations and measurement. The effect of 2-body magnetic terms and other
interactions is discussed. The present data set enhances by more than an order of magnitude the heretofore available data for
transition probabilities of Fe XVII.
Description
Relevant data is available at: http://www.astronomy.ohio-state.edu/~nahar/nahar_radiativeatomicdata/index.html
Keywords
atomic data, radiation mechanisms -- general, X-ray -- general
Citation
Nahar, Sultana Nurun, Eissner, Werner, Chen, Guo-Xin, Pradhan, Anil K. "Atomic data from the Iron Project LIII. Relativistic allowed and forbidden transition probabilities for Fe XVII," Astronomy & Astrophysics, v. 408, 2003, pp. 789-801.