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Rate constant for the reaction of O(3P) with diacetylene from 210 to 423 KThe absolute rate constant for the reaction of O(3P) with diacetylene (C4H2) has been measured as a function of pressure and temperature by the flash-photolysis/resonance-fluorescence method. At 298 K and below, no pressure dependence of the rate constant was observed, but at 423 K a moderate (factor-of-2) increase was detected in the range 3 to 75 torr Ar.Results at or near the high-pressure limit are represented by an Arrhenius expression over the temperature range 210 to 423 K. The results are compared with previous determinations, all of which employed the discharge-flow/mass-spectrometry technique. The mechanism of the reaction is considered, including both primary and secondary processes. The heats of formation of the reactants, adducts, and products for the O(3P) + C4H2 reaction are discussed and contrasted with those for O(3P) + C2H2.
Document ID
19870029114
Document Type
Reprint (Version printed in journal)
External Source(s)
Authors
Mitchell, M. B. (NASA Goddard Space Flight Center Greenbelt, MD, United States)
Nava, D. F. (NASA Goddard Space Flight Center Greenbelt, MD, United States)
Stief, L. J. (NASA Goddard Space Flight Center Greenbelt, MD, United States)
Date Acquired
August 13, 2013
Publication Date
September 15, 1986
Publication Information
Publication: Journal of Chemical Physics
Volume: 85
ISSN: 0021-9606
Subject Category
CHEMISTRY AND MATERIALS (GENERAL)
Distribution Limits
Public
Copyright
Other