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- W2181982533 abstract "The multichannel R-matrix method is used to compute electron impact excitation collision strengths in Ar iv for all fine-structure transitions among the 4S°, 2D° and 2P° levels in the 3s23p3 ground configuration. Included in the expansion of the total wavefunction are the lowest 13 LS target eigenstates of Ar iv formed from the 3s23p3,3s3p4 and 3s23p23d configurations. The effective collision strengths, obtained by averaging the electron collision strengths over a Maxwellian distribution of electron velocities, are presented for all 10 fine-structure transitions over a wide range of electron temperatures of astrophysical interest (Te = 2000–100 000 K). Comparisons are made with an earlier 7-state close-coupling calculation by Zeippen, Butler & Le Bourlot, and significant differences are found to occur for many of the forbidden transitions considered, in particular those involving the 4S° ground state, where discrepancies of up to a factor of 3 are found in the low-temperature region." @default.
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- W2181982533 date "1997-01-21" @default.
- W2181982533 modified "2023-09-25" @default.
- W2181982533 title "Effective collision strengths for fine-structure forbidden transitions among the 3s23p3 levels of Ar IV" @default.
- W2181982533 doi "https://doi.org/10.1093/mnras/284.3.754" @default.
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