Abstract
Absolute cross sections of the associative ionization in the collision of with or have been measured in a merged beam experiment over a relative velocity interval ranging from 0.4 to . At a given relative velocity, the two cross sections significantly differ at low velocities where the cross section for formation exceeds that of by as much as 35%. The difference, however, decreases with the velocity and falls in the experimental error above . In both cases the energy dependence becomes compatible at low energy with an law.
Published Version
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