Gas-Phase Hydrogen Isotope Exchange in HF + D sub 2 O

摘要

The gas-phase isotope exchange reaction of HF and D sub 2 O has been studied by flow tube and matrix isolation techniques over a range of concentrations and reaction times. The matrix isolation/FTIR gas sampling and analysis technique proved capable of detecting reactants and products even at low concentrations (0.02% and less) and for reaction times down to 10 msec. The reaction under study, however, is sufficiently rapid that it appeared complete at 10 msec even at the lowest reactant concentrations used. From these results, it is therefore possible only to place a lower bound on the reaction rate. This lower bound, arrived at by computer modeling an assumed second order reaction in the flow tube, represents a refinement in the previously established limit by about a factor of 10 exp 4 and may thus be of utility in UF sub 6 atmospheric release models. 4 refs., 13 figs., 2 tabs. (ERA citation 11:013803)