Abstract
The mass spectra of excess-kinetic-energy ions (KE ions) formed under electron impact have been studied by using a conventional mass spectrometer with a modified ion source. Direct cleavages are favored over rearrangement processes for KE-ion formations. Therefore the correlation between the structure of a compound and the mass spectrum of its KE ions is simpler than that for ordinary mass spectra. Several aliphatic compounds containing the C 2H 5O or CHO 2 groups have been measured and the characteristics of KE ions and of their masas spectra are described in relation to the determination of the structure of organic compounds.
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