Atomic data from the Iron Project. LIII. Relativistic allowed and forbidden transition prob.pdf

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Atomic data from the Iron Project. LIII. Relativistic allowed and forbidden transition prob.pdf

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Atomic data from the Iron Project. LIII. Relativistic allowed and forbidden transition prob

a r X i v : a s t r o - p h / 0 3 0 2 5 6 1 v 1 2 6 F e b 2 0 0 3 Astronomy Astrophysics manuscript no. ms February 2, 2008 (DOI: will be inserted by hand later) Atomic data from the Iron Project LIII. Relativistic allowed and forbidden transition probabilities for Fe ???? Sultana N. Nahar 1 , Werner Eissner 2 , Guo-Xin Chen 1 , and Anil K. Pradhan 1 1 Department of Astronomy, The Ohio State University, Columbus, OH 43210, USA e-mail: nahar@ ? 2 Institut fu?r Theoretische Physik, Teilinstitut 1, 70550 Stuttgart, Germany the date of receipt and acceptance should be inserted later Abstract. An extensive set of fine structure levels and corresponding transition probabilities for allowed and forbidden tran- sitions in Fe ???? is presented. A total of 490 bound energy levels of Fe ???? 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 2.6×104 allowed (E1) transitions that are of dipole and intercombination type, and about 3000 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 emis- sion for the E1 type transitions are obtained in the relativistic Breit-Pauli R-matrix approximation. A valus 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 spec- troscopically 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 disc