Calculations of transitions in singly ionised iron

Details Calculations of transitions in singly ionised iron Calculations of transitions in singly ionised iron

Jan 1999

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999phdt........49d&link_type=abstract

Thesis (PhD). QUEEN'S UNIVERSITY OF BELFAST (NORTHERN IRELAND), Source DAI-C 61/02, p. 548, Summer 2000, 161 pages.

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The configuration interaction wavefunction is written as a sum of configuration state functions, Y=aiFi . This allows a large amount of electron correlation to be included easily in any calculation. For this work the configuration interaction computer code CIV3 was used to calculate wavefunctions and produce atomic data for singly ionised iron, Fe II. Iron is very important due to the abundance of both the element and the ions in astrophysical objects. It is the sixth most abundant element in the universe. The complex atomic structure of Fe II gives rise to spectra showing many violations of basic angular momentum selection rules. One such violation was studied in the anomalous mixing of the x Po6 and w P2o levels when the aD5/26- wPo3/2 2,DS=2 , forbidden transition was observed to be of similar strength to the allowed a6D5/2- x6 Po3/2 transition. This mixing arises through the influence of the 3d6(D3) 4pPo4 level acting as a catalyst. Other transitions investigated in this work included the aD6- yPo6 (UV8) multiplet, excellent agreement was achieved between our result for the D9/26- Po7 /26 transition and the only available observationally derived data for this multiplet, produced by Cardelli and Savage. Other results for transitions within this multiplet were in good agreement with recently produced data, both experimental and independent theoretical values. The revival of interest in Fe II has produced more recent data for this ion, both experimental and theoretical. This gave a larger source of data for comparison with our work and allowed the study of the aD6-z Do6 , aD6-z Fo6 and aD6- z Po6 multiplets. Fewer results are available for transitions to levels in yDo6, yFo6 and higher multiplets so comparisons for these multiplets were more difficult. Our calculations show up deficiencies in some earlier work which did not take into account the interactions between odd parity LS states.

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