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Laboratory studies of UV emissions of H2 by electron impact - The Werner- and Lyman-band systemsThe vacuum ultraviolet electron-impact-induced fluorescence emissions of H2 were studied for the Lyman and Werner band systems in the range of 120-170 nm, using an optical system containing a photomultiplier and a spectrometer, over an energy range from threshold to 400 eV. The emission cross sections for the Lyman and Werner transitions at 100 eV are determined. The cross-section ratio is in excellent agreement with theoretical calculations and experimental data for the optical oscillator strengths. The cross-section for cascading to the B state is stated as a percentage of the total emission cross section at both 100 and 300 eV, increasing substantially at 20 eV. The vibrational population distribution of the B state is found to be a function of electron-impact energy as the importance of cascading relative to direct excitation changes with electron-impact energy.
Document ID
19820046199
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
Authors
Ajello, J. M.
(Jet Propulsion Lab., California Inst. of Tech. Pasadena, CA, United States)
Srivastava, S. K.
(California Institute of Technology, Jet Propulsion Laboratory, Pasadena CA, United States)
Yung, Y. L.
(California Institute of Technology Pasadena, CA, United States)
Date Acquired
August 10, 2013
Publication Date
May 1, 1982
Publication Information
Publication: Physical Review A - General Physics
Subject Category
Atomic And Molecular Physics
Accession Number
82A29734
Funding Number(s)
CONTRACT_GRANT: NAS7-100
Distribution Limits
Public
Copyright
Other

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