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Collisional excitation and radiative properties of N II - The strong intercombination (1D - 3P0) transition at 748 ALaboratory measurements of EUV emission from electron-excited N2 have been obtained at medium resolution, providing N II EUV emission cross section measurements and allowing the confirmation of recent calculations by Fawcett (1987) indicating the presence of a strong intercombination line in N II at 748.37 A. The most recently available data are used to predict the basic collisional and radiative properties of N II, the plasma diagnostic properties are briefly explored, and radiative cooling coefficients are given. Some basic properties of electron-excited N II and N2 are examined in the EUV in order to diagnose emission spectra of the earth and Titan. The N II emissions in the earth dayglow, particularly at 916 A, are much brighter than current estimates of source rates. The N II 1085 A line in the dayglow contains a significant component from dissociative photoionization excitation. The N II 1085 A, 916 A, and 670 A lines in the Titan dayglow spectrum appear to be compatible with direct electron excitation of N2.
Document ID
19910041763
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
External Source(s)
Authors
Tripp, T. M.
(Arizona Univ. Tucson, AZ, United States)
Shemansky, D. E.
(Arizona, University Tucson, United States)
James, G. K.
(Arizona Univ. Tucson, AZ, United States)
Ajello, J. M.
(JPL Pasadena, CA, United States)
Date Acquired
August 14, 2013
Publication Date
February 20, 1991
Publication Information
Publication: Astrophysical Journal, Part 1
Volume: 368
ISSN: 0004-637X
Subject Category
Atomic And Molecular Physics
Accession Number
91A26386
Funding Number(s)
CONTRACT_GRANT: NAGW-1904
CONTRACT_GRANT: NAGW-649
CONTRACT_GRANT: NSF ATM-87-15709
Distribution Limits
Public
Copyright
Other

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