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Crossed beam studies of ion-molecule reactions in methane and ammoniaA crossed-beam apparatus is used to measure the product ion velocity and angular distributions for the following ion-molecule reactions in the relative energy range from 2 to 9 eV: CH4(+) + NH3 yields NH4(+) + CH3; CH4(+) + NH3 yields CNH5(+) + H2; NH2(+) + CH4 yields CNH4(+) + H2 (or 2H); and CH3(+) + NH3 yields CNH4(+) + H2 (or 2H). These reactions are also studied by means of deuterium labeling as a further probe of the detailed reaction dynamics. Probability contour plots for the four reactions are constructed in Cartesian velocity space, and product peaks in the plots are discussed. Relative cross sections and Q values are computed for two of the reactions as well as for the corresponding deuterium-labelled reactions. The results show that the present ion-neutral condensation reactions are highly exothermic with a deep well for the internal complex, that little hydrogen scrambling occurs, and that the energy of the reactions is released mainly as internal energy, even to the extent of producing two hydrogen atoms in some cases rather than one hydrogen atom or molecule.
Document ID
19770034716
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
Authors
Smith, G. P. K.
(Yale Univ. New Haven, CT, United States)
Saunders, M.
(Yale Univ. New Haven, CT, United States)
Cross, R. J., Jr.
(Yale University New Haven, Conn., United States)
Date Acquired
August 9, 2013
Publication Date
March 17, 1976
Publication Information
Publication: American Chemical Society
Subject Category
Inorganic And Physical Chemistry
Accession Number
77A17568
Distribution Limits
Public
Copyright
Other

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