Effects of Rotational, Vibrational, and Translational Energy on the Rate Constants for the Isotope Exchange Reactions of OH(-) + Dsub2 and OD(-) + Hsub2
Abstract
Rate constants for the isotope exchange reactions of OH(-) with D sub 2 and OD(-) with H sub 2 have been measured as a function of average center-of- mass kinetic energy at several temperatures. The reaction of OH(-) with D sub 2 is slightly exothermic, and the rate constant has a negative temperature dependence. The kinetic energy dependences of the rate constants have minima near 0.1 eV. A strong negative dependence on the D sub 2 rotational temperature was found. The reason for this dependence is unclear at present. In contrast, the reaction of OD(-) with H sub 2 is slightly endothermic and shows positive dependences on both temperature and kinetic energy. The negative rotational dependence for the reaction of OD(-) with H sub 2 is not as large as that for OH(-) + D sub 2, presumably because rotational energy can help overcome the endothermicity in the case of OD(-) + H sub 2. Vibrational energy is observed to promote reactivity in both reactions.
Document Details
- Document Type
- Technical Report
- Publication Date
- Feb 15, 1994
- Accession Number
- ADA277467
Entities
People
- Albert A Viggiano
- Robert A. Morris
Organizations
- Phillips Laboratory