Systematic Studies of N IV Transitions of Astrophysical Importance

J Fleming, Tomas Brage, KL Bell, N Vaeck, A HIibbert, MR Godefroid, CF Fischer

Research output: Contribution to journalArticlepeer-review


E1, M2, M1 and E2 rates of transitions between n = 2 levels of N IV have been calculated using the tw 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 S-1-P-1 degrees resonance line, our recommended f-value is 0.609 with an estimated uncertainty of 0.002, while our recommended A-value for the S-1(0)-P-3(1) degrees intercombination line is 580 s(-1) with an estimated uncertainty of 10 s(-1).
Original languageEnglish
Pages (from-to)758-768
JournalAstrophysical Journal
Issue number2
Publication statusPublished - 1995
Externally publishedYes

Bibliographical note

The information about affiliations in this record was updated in December 2015.
The record was previously connected to the following departments: Physics, science (011013100)

Subject classification (UKÄ)

  • Physical Sciences




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