Energetics of the Collision-Induced Dissociations C2H2+→C2H+ + H and C2H2+→H+ + C2H

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Abstract
The energetics of the collision-induced dissociation of fast C2H2+ ions into C2H+ + H and H+ + (C2H) are determined from the measurements of the translational energy of the fragments and from the study of the influence of ionizing electron energy, incident ion energy, delay between production of the ions and collision, and nature of the target used. Evidence is given for the occurrence of three different processes: (i) electronic excitation to a dissociative state, (ii) adiabatic dissociation following momentum transfer, and possibly (iii) collision-induced predissociation, processes (i) and (iii) giving rise to C2H+ + H and process (ii) to H+ + C2H. The adiabatic correlations between the states of C2H2+ ions and of their fragments are discussed.