1962 Volume 35 Issue 7 Pages 1221-1226
With a conventional analytical mass spectrometer and without any additional electrodes, fragment ions produced with excess kinetic energies by electron impact can be detected and studied quantitatively. Mainly methyl KE ions in the spectra of seven hydrocarbons have been measured. A comparison of the results on methyl ions in four hydrocarbons with reported values showed a satisfactory consistency.
An appreciable part of the m/e 15 rearrangement ions of 1,3-butadiene had excess kinetic energies. The mechanism of the formation of the ions has been proposed which assumes a transfer of the hydrogen atom from a second carbon atom of the molecule to the first carbon atom followed by the recoil of the resulting two groups of atoms. The study of the KE ions in the spectra of the ethylene molecule from the standpoint of the H-M assumption shows that the mechanism of the formation of various KE ions is complicated and deserves more detailed study.
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