OSU Navigation Bar

The Ohio State University University Libraries Knowledge Bank

The Knowledge Bank is scheduled for regular maintenance on Sunday, April 20th, 8:00 am to 12:00 pm EDT. During this time users will not be able to register, login, or submit content.

Atomic data from the Iron Project XXXV. Relativistic fine structure oscillator strengths for Fe XXIV and Fe XXV

Please use this identifier to cite or link to this item: http://hdl.handle.net/1811/44717

Show simple item record

Files Size Format View
ds1621.pdf 302.2Kb PDF View/Open

dc.creator Nahar, Sultana Nurun
dc.creator Pradhan, A. K.
dc.date.accessioned 2010-01-28T21:29:51Z
dc.date.available 2010-01-28T21:29:51Z
dc.date.issued 1999-03
dc.identifier.citation Nahar, Sultana Nurun, Pradhan, A. K. "Atomic data from the Iron Project XXXV. Relativistic fine structure oscillator strengths for Fe XXIV and Fe XXV," Astronomy & Astrophysics Supplement Series, v. 135, March, 1999, pp. 347-357. en_US
dc.identifier.issn 0365-0138
dc.identifier.uri http://hdl.handle.net/1811/44717
dc.description Relevant data is available at: http://www.astronomy.ohio-state.edu/~nahar/nahar_radiativeatomicdata/index.html en_US
dc.description.abstract The first large-scale calculations of relativistic radiative transition probabilities from the Iron Project is reported for dipole allowed and intercombination (E1) transitions in Li-like Fe XXIV and He-like Fe XXV. The ab initio calculations are carried out in the close coupling approximation using the Breit-Pauli R-matrix method in intermediate coupling characterized by SLJ, with total (2S + 1) = 2,4, L = 7, J = 1/2 − 11/2 even and odd parity, for Fe XXIV, and with total (2S+1) = 1,3, L = 9, and J = 0−4 for Fe XXV. The eigenfunction expansions for the target ions include 13 levels up to the n = 3 for Fe XXV, and 16 levels up to the n = 4 for Fe XXVI, respectively. The calculated number of bound levels, 83 for Fe XXIV and 138 for Fe XXV, is much larger than experimentally observed. The level energies are in good agreement for the common levels. All dipole and intercombination fine structure transitions involving the calculated bound levels up to n = 10 and l = 5 or 6 are considered. Oscillator strengths, line strengths, and Einstein A-coefficients are tabulated for 802 transitions in Fe XXIV and 2579 transitions in Fe XXV. The results compare well with limited subsets of transitions considered in previous works including fully relativistic and QED corrections. Additional comparisons between the length and the velocity formulations indicate an overall accuracy between 1 − 10%. The range of uncertainty is indicative of the relatively small influence of atomic effects, such as the two-body Breit interaction terms and finite nuclear mass term, that are not included in the Breit-Pauli approximation employed in the present calculations. The extensive set of data is expected to be useful in the analysis of X-ray and XUV spectra from astrophysical sources. en_US
dc.description.sponsorship This work was partially supported by U.S. National Science Foundation (AST-9870089) and the NASA ADP program. en_US
dc.language.iso en_US en_US
dc.subject atomic data en_US
dc.subject X-ray -- galaxies en_US
dc.title Atomic data from the Iron Project XXXV. Relativistic fine structure oscillator strengths for Fe XXIV and Fe XXV en_US
dc.type Article en_US
dc.identifier.doi 10.1051/aas:1999447
dc.identifier.osuauthor nahar.1
dc.identifier.osuauthor pradhan.1