Kinetic energy dependence of the branching ratios of the reaction of N+ions with O2

摘要

The kinetic energy dependence of the branching ratios of the reaction of N+with O2has been determined in the collision energy range from 0.06 to 1.8 eV using a selectedhyphen;ion flowhyphen;drift tube. At energies near thermal, the branching ratios were found to be the following percentages: O2+51plusmn;4, NO+43plusmn;4, and O+6plusmn;4, in good agreement with the results of some of the earlier thermalhyphen;energy studies. At relative kinetic energies above about 0.1 eV, the O+2channel increases and eventually becomes dominant, at the expense of the NO+channel. At the highest energy investigated in the present study, the branching ratios obtained are 79percnt;, 19percnt;, and 2percnt;, respectively, and join rather smoothly with crossedhyphen;beam data extending to higher energies. The O+channel remains a minor channel over the energy range studied here. These energyhyphen;dependent branching ratios are in striking contrast to the total rate constant for this reaction, which is virtually energyhyphen;independent for energies below 1 eV.