Abstract
Using the supersonic expansion technique in conjunction with a high-resolution mass spectrometer, the unimolecular and collision-induced dissociation of Ar 25 + has been studied. From a comparison of the energetics associated with these two fragmentation steps, it is shown that during a collision in which Ar 25 + has a laboratory-frame kinetic energy of 8000 eV, the ion cluster receives approximately 200 cm −1 of internal excitation. It is concluded that this energy appears as vibrational excitation.
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