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Proton collisional excitation in the lowest lying 3P terms of ions in the Be and Mg isoelectronic sequencesProton collisional excitation cross sections and rate constants are presented for transitions between the 3P(J) fine-structure levels of the lowest-lying sp configurations in a number of astrophysically important ions belonging to the Be and Mg isoelectronic sequences. The calculations were made by direct integration of the Schroedinger equation resulting from semiclassical Coulomb excitation theory. The cross sections and rate constants for the 3P(J) transitions in the lowest-lying P(2) configurations are expected to be similar to those for the corresponding sp configuration transitions, and this is illustrated for C III. For the high-temperature ion Ca XVII alpha particle excitation is shown to be unimportant for situations involving ordinary values of the He/H abundance ratio. A simple, but apparently accurate method for determining certain radial integrals for low-lying excited configurations is proposed.
Document ID
19790066818
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
External Source(s)
Authors
Landman, D. A.
(Hawaii, University Honolulu, Hawaii, United States)
Brown, T.
(Hawaii Univ. Honolulu, HI, United States)
Date Acquired
August 9, 2013
Publication Date
September 1, 1979
Publication Information
Publication: Astrophysical Journal
Subject Category
Astrophysics
Accession Number
79A50831
Funding Number(s)
CONTRACT_GRANT: NGL-12-001-011
Distribution Limits
Public
Copyright
Other

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