The relative abundances of \documentclass{article}\pagestyle{empty}\begin{document}$ {\rm{R}}_{\rm{1}} \mathop {\rm{C}}\limits^{\rm{ + }} {\rm{O}} $\end{document} and \documentclass{article}\pagestyle{empty}\begin{document}$ {\rm{R}}_{\rm{2}} \mathop {\rm{C}}\limits^{\rm{ + }} {\rm{O}} $\end{document} from R1R2CO, and the low voltage mass spectra of some methyl ketones

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Abstract
The relative abundances of the ions formed by the loss of the larger and the smaller radical from RCOCH3 are interpreted in terms of the appearance energies of these fragments, calculated from the heats of formation of the relevant species. The appearance energies for the McLafferty rearrangement are also reported, as are the low voltage, low temperature mass spectra of propanone, butanone, pentan‐2‐one, pentan‐3‐one, 3‐methylbutan‐2‐one and 3,3′dimethylbutan‐2‐one.

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