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Atomic data from the iron project. 3: Rate coefficients for electron impact excitation of boron-like ions: Ne VI, Mg VIII, Al IX, Si X, S XII, Ar XIV, Ca XVI and Fe XXIICollison strengths and maxwellian averaged rate coefficients have been calculated for the 105 transitions among all 15 fine structure levels of the 8 LS terms 2s(sup 2) 2 P(P-2(sup 0 sub 1/, 3/2)), 2s2p(sup 2)(P-4(sub 1/2,3/2,5/2), D-2(sub 3/2, 5/2), S-2(sub 1/2), P-2(sub 1/2, 3/2)), 2p(sup 3)(S-4(sup 0)(sub 3/2), D-2(sup 0 sub 3/2, 5/2), P-2(sup 0 sub 1/2, 3/2)) in highly- charged B-like Ne, Mg, Al, Si, S, Ar, Ca and Fe. Rate coefficients have been tabulated at a wide range of temperatures, depending on the ion charge and abundance in plasma sources. Earlier work for O IV has also been extended to include the high temperature range. A brief discussion of the calculations, sample results, and comparison with earlier works is also given. While much of the new data should be applicable to UV spectral diagnostics, the new rates for the important ground state fine structure transition P-2(sup 0 sub 1/2)-P-2(sup 0 sub 3/2) should result in significant revision of the IR cooling rates in plasmas where B-like ions are prominent constituents, since the new rate coefficients are generally higher by several factors compared with the older data.
Document ID
19950042682
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
Authors
Zhang, Hong Lin
(Ohio State Univ. Columbus, OH, United States)
Graziani, Mark
(Ohio State Univ. Columbus, OH, United States)
Pradhan, Anil K.
(Ohio State Univ. Columbus, OH, United States)
Date Acquired
August 16, 2013
Publication Date
March 1, 1994
Publication Information
Publication: Astronomy and Astrophysics
Volume: 283
Issue: 1
ISSN: 0004-6361
Subject Category
Astronomy
Accession Number
95A74281
Funding Number(s)
CONTRACT_GRANT: NAGW-3315
CONTRACT_GRANT: NSF PHY-91-15057
Distribution Limits
Public
Copyright
Other

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