The decomposition of C6H5CO+ ions produced by electron impact from seven alkyl phenyl ketones, C6H5COR (R=H, CH3, C2H5, n-C3H7, iso-C3H7, n-C4H9, n-C5H11), has been studied. By determining the heats of formation, the C6H5CO+ ions produced from the different precursors in the vicinity of the threshold are shown to have the same structure, and it is also shown that there is a linear relationship between the heat of formation of the activated complex for the reaction C6H5CO+→C6H5++CO and the vibrational degrees of freedom of the neutral fragment, R.
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Tajima et al. (1973) studied this question.
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