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Vacuum ultraviolet studies of electron impact of helium Excitation of He n1P0 Rydberg series and ionization-excitation of He(+) nl Rydberg seriesThe cross sections for the He I 1s2 1S-1snp 1P0 series have been measured using a relative flow method, with the absolute scale fixed by the H Ly-alpha dissociative excitation cross section standard. The results are compared with those obtained using a relative cross section data analysis by modified Born approximation, and good agreement is found. Cross sections for the ionization-excitation of the He II 121.51 nm and He II 164.04 nm transmissions have been measured, and the results strongly suggest that theoretical calculations of the reactions differ fundamentally from physical reality. The failure of the theory to describe experimental results stems from the neglect in the theory of electron correlation effects between the two orbital electrons.
Document ID
19860026156
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
External Source(s)
Authors
Shemansky, D. E.
(Arizona Univ. Tucson, AZ, United States)
Hall, D. T.
(Arizona, University Tucson, AZ, United States)
Ajello, J. M.
(Arizona Univ. Tucson, AZ, United States)
Franklin, B.
(California Institute of Technology Jet Propulsion Laboratory, Pasadena, United States)
Date Acquired
August 12, 2013
Publication Date
September 15, 1985
Publication Information
Publication: Astrophysical Journal, Part 1
Volume: 296
ISSN: 0004-637X
Subject Category
Atomic And Molecular Physics
Accession Number
86A10894
Funding Number(s)
CONTRACT_GRANT: NAS7-100
CONTRACT_GRANT: NAGW-106
CONTRACT_GRANT: NAGW-649
Distribution Limits
Public
Copyright
Other

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