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Dissociation of CH4 and CD4 by electron impact - Production of metastable and high-Rydberg hydrogen and carbon fragmentsProduction of hydrogen and carbon atoms in metastable and high-lying Rydberg states by electron-impact dissociation of methane and deuterated methane is investigated for incident electron energies ranging from threshold values to 300 eV. Threshold energies for five different processes resulting in metastable hydrogen and carbon atoms are determined in the energy range from 20 to 70 eV, and it is shown that metastable hydrogen atoms are produced in four of these collisional processes while metastable carbon atoms are produced in the other. The nature of each collisional process is described, differential cross sections are derived for the dissociative excitation of both types of atoms to metastable and high-Rydberg states at 100 eV, and the onset energy for UV photon production is measured. Much of the data is interpreted in terms of the ion core model suggested by Kupriyanov (1968) and developed by Freund (1971).
Document ID
19750057448
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
External Source(s)
Authors
Finn, T. G.
Carnahan, B. L.
Wells, W. C.
Zipf, E. C.
(Pittsburgh, University Pittsburgh, Pa., United States)
Date Acquired
August 8, 2013
Publication Date
August 15, 1975
Publication Information
Publication: Journal of Chemical Physics
Volume: 63
Subject Category
Atomic And Molecular Physics
Accession Number
75A41520
Funding Number(s)
CONTRACT_GRANT: NGL-39-011-030
CONTRACT_GRANT: DA-31-124-ARO(D)-440
Distribution Limits
Public
Copyright
Other

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