Abstract
A triple-cell ICR spectrometer has been used to study the dissociation of electronically excited acetone ions (CH 3) 2CO +* induced by collision with He and to measure their radiative lifetime. The threshold energy for CID is around 0.15 eV, consistent with a small barrier to curve-crossing into the ground state from which dissociation occurs. Endothermic charge transfer with O 2 has also been used to probe the internal energy of acetone ions as a function of storage time. The radiative lifetime depends on the internal energy of the ions: 4 +2 −1 and 14 ± 3 ms, determined respectively by CID with He and charge transfer with O 2, corresponding to E int ⩾ 2.9 eV and E int ⩾ 2.4 eV.
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