Phys. Rev. A 61, 022707 (2000) [9 pages]Effective collision strengths for hyperfine-structure transitions with inclusion of resonance effectsReceived 9 August 1999; published 10 January 2000 Calculations are made of the resonance contribution to electron-impact excitation of Li-like 57Fe and H-like 14N ions to the upper hyperfine levels that produce mm lines of likely astrophysical interest. The resonance contribution is found to be very important for 57Fe, but rather unimportant for 14N. Inclusion of the effect of radiative decay is found to be slightly significant for 57Fe, but insignificant for 14N. © 2000 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevA.61.022707
DOI:
10.1103/PhysRevA.61.022707
PACS:
34.80.Kw
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