Transition rates in the B-, C-, N-, O-, and Ne-like sequences from relativistic CI calculations

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Transition rates in the B-, C-, N-, O-, and Ne-like sequences from relativistic CI calculations

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Publication Conference Poster
Title Transition rates in the B-, C-, N-, O-, and Ne-like sequences from relativistic CI calculations
Author(s) Jönsson, Per ; Gustafsson, Stefan ; Ekman, Jörgen ; Bengtsson, Peter ; Rynkun, Pavel ; Gaigalas, Gediminas
Date 2011
Editor(s) Scholten, O
English abstract
Atomic data are important in astrophysical applications and transition data can be used in the determination of element abundances and plasma diagnostics [1]. To provide for the extensive data needs a number of general computer codes such as SUPERSTRUCTURE, CIV3, and ATSP2K have been developed. As an alternative to these codes, which all rely on the Breit-Pauli approximation, the fully relativistic GRASP2K code [2] can be used. GRASP2K is based on the multicon guration Dirac-Hartree-Fock method and implements a bi-orthogonal transformation method that permits initial and nal states in a transition array to be optimized separately, which, in many cases, leads to more accurate values of the resulting rates [3]. The GRASP2K package also contains modules to compute diagonal and o -diagonal hyper ne interaction constants, isotope shifts, Land e gJ factors, and splittings of magnetic sub-state in intermediate and strong magnetic elds. In this work, GRASP2K has been applied to provide highly accurate spectroscopic data for transitions in the B-, C-, N-, O-, and Ne-like sequences [4]. Valence, core-valence, and core-core correlation e ects were accounted for through SD-MR expansions to increasing sets of active orbitals. The calculated energy levels generally agree to within a few hundred cm with the experimentally compiled results. Babushkin (length) and Coulomb (velocity) forms of transition rates di er with less than 1% for the majority of the allowed transitions. The perspectives of massive data production on parallel clusters to cover the needs of the astrophysical community is discussed.
Link http://www.egas43.org/docs/abstracts/book_of_abstracts_online.pdf (external link to publication)
Publisher European Physical Society
Host/Issue Abstracts 43rd Conference of the European Group for Atomic Systems (EGAS);
Series/Issue europhysics conference abstracts;
Pages 142
Language eng (iso)
Subject(s) Sciences
Research Subject Categories::NATURAL SCIENCES
Note 43st European Group for Atomic Systems, Fribourg (Switzerland), June 28 – July 2, 2011
Handle http://hdl.handle.net/2043/13045 (link to this page)

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