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• W2477882804 abstract "There have been discussions in the recent literature regarding the accuracy of the available electron impact excitation rates (equivalently effective collision strengths ϒ) for transitions in Be-like ions. In the present paper we demonstrate, once again, that earlier results for ϒ are indeed overestimated (by up to four orders of magnitude), for over 40 per cent of transitions and over a wide range of temperatures. To do this we have performed two sets of calculations for N iv, with two different model sizes consisting of 166 and 238 fine-structure energy levels. As in our previous work, for the determination of atomic structure the grasp (General-purpose Relativistic Atomic Structure Package) is adopted and for the scattering calculations (the standard and parallelised versions of) the Dirac Atomic R-matrix Code (darc) are employed. Calculations for collision strengths and effective collision strengths have been performed over a wide range of energy (up to 45 Ryd) and temperature (up to 2.0 × 106 K), useful for applications in a variety of plasmas. Corresponding results for energy levels, lifetimes and A-values for all E1, E2, M1 and M2 transitions among 238 levels of N iv are also reported." @default.
• W2477882804 created "2016-08-23" @default.
• W2477882804 creator A5062517153 @default.
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• W2477882804 date "2016-07-27" @default.
• W2477882804 modified "2023-10-18" @default.
• W2477882804 title "Electron impact excitation of N iv: calculations with the darc code and a comparison with ICFT results" @default.
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• W2477882804 doi "https://doi.org/10.1093/mnras/stw1369" @default.
• W2477882804 hasPublicationYear "2016" @default.
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