Kinetic isotope effects in the reaction of fluorine atoms with molecular hydrogen. I H2/D2 kinetic isotope effect

Abstract

The kinetic isotope effect in the reaction of fluorine atoms with H2 and D2 was measured as a function of reaction temperature in the range of 163 to 417°K. The isotope effect can be expressed as an Arrhenius type equation: k F+H2 / k F+D2 = (1.04 ± 0.02) exp[(370 ± 10)/RT]. Experiments were carried out in a flow system with direct mass spectrometric analysis of reaction products. Fluorine atoms were produced by dissociating SF6 or CF4 in a microwave discharge.