Abstract
The electron impact ionisation of 2-heptanone between 13 and 78 eV is studied using mass spectrometry. CH 3C(O)CH 2CH 2CH 2CH 2CH 3 + and fragment ions are produced with a total cross-section of 5 × 10 −16 cm 2 towards 50 eV. Two ions, identified as CH 3CO + (43 amu) and CH 3C(OH)CH 2 + (58 amu), contribute to about 60% of the total cross-section for electron energies above the ionisation threshold. The detected ions are identified using ab initio calculations. For E = 14 eV, the ion of 58 amu is the most abundant followed by an ion of 59 amu identified as being CH 3C(OH)CH 3 +; they result from a bond cleavage with one or two H atom rearrangements. For E ≥ 48 eV, the ion of 43 amu is the most abundant; it results from an α-cleavage reaction in the molecular ion.
Published Version
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