Abstract
The dependence of the fragmentation of the 3-penten-2-ol-1,1,1- d 3 molecular ion on internal energy has been investigated by charge exchange mass spectrometry over the internal energy range from metastable ions to ∼ 6.3 eV. At low internal energies, fragmentation by loss of CH 3 is favoured, but loss of CD 3 increases rapidly in importance with increasing internal energy until ∼6 eV internal where CH 3 and CD 3 are lost with about equal probability. The results are compared with earlier field ionization kinetics (FIK) and angle resolved mass spectrometry (ARMS) results. This comparison shows that the FIK results in the time range 10 −9 to 10 −11 s refer to ions with internal energies in the 1–4 eV range, while the ARMS results are best interpreted in terms of variation of the energy deposition function with angle of observation of the fragmentation products.
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