Abstract
The Doppler profiles and translational energy distributions of H ∗ produced in Ar +−C 2H 2 n ( n = 2, 3) collisions have two major components. The slow component has a peak at about 10 eV and has been assigned as being produced through the dissociative excitation of the parent molecule. The fast component has a large translational energy with its peak up to 100 eV, and should be produced through direct collision between Ar + and one of the H atoms in the molecule; the rest of the molecule is a spectator. The translational energy of the fast component is consistent with a hard-sphere collision model.
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