Systematic studies of Niv transitions of astrophysical importance
- Department of Applied Mathematics and Theoretical Physics, Queens University of Belfast, Belfast BT7 1NN, Northern Ireland (United Kingdom)
- National Research Council and NASA/Goddard Space Flight Center, Code 681, Greenbelt, Maryland 20771 (United States)
- Laboratoire de Chimie Physique Moleculaire, Universite Libre de Bruxelles, CP 160/09, 50, avenue F.D. Roosevelt, B-1050 Bruxelles (Belgium)
- Department of Computer Science, Box 1679B, Vanderbilt University, Nashville, Tennessee 37235 (United States)
E1, M2, M1, and E2 rates of transitions between {ital n}=2 levels of Niv have been calculated using the two independent codes CIV3 and MCHF. Convergence of each of the approaches has been studied and comparisons made as the complexity of the calculations increases to include valence, core-valence and core-core correlation. The agreement between the two methods is sufficiently good to allow us to set quite narrow uncertainty bars. For the {sup 1}{ital S}{endash}{sup 1}{ital P}{sup 0} resonance line, our recommended {ital f}-value is 0.609 with an estimated uncertainty of 0.002, while our recommended {ital A}-value for the {sup 1}{ital S}{sub 0}{endash}{sup 3}{ital P}{sup 0}{sub 1} intercombination line is 580 s{sup {minus}}{sup 1} with an estimated uncertainty of 10 s{sup {minus}}{sup 1}. {copyright} 1995 The American Astronomical Society.
- OSTI ID:
- 278911
- Journal Information:
- Astrophysical Journal, Vol. 455, Issue 2; Other Information: PBD: Dec 1995
- Country of Publication:
- United States
- Language:
- English
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