A STUDY OF THE KINETIC ENERGY OF IONIC PRODUCTS FROM ELECTRON IMPACT DISSOCIATION OF MOLECULES.
DENVER UNIV COLO DEPT OF CHEMISTRY
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The purpose of the study of gas phase reactions among ions and molecules, such as occur in radiation chemistry, plasmas and upper and lower atmosphere chemistry, was to clarify the energetics of the simplest reaction steps. The kinetic energy determinations have been among the most difficult, largely because they are not directly observable by spectroscopic techniques. An attempt was made to devise a method for the direct measurement of the kinetic energies of the ionic products resulting from electron impact dissociation of molecules in a mass spectrometer. A time-of-flight mass spectrometer was modified to be entirely free of magnetic fields and to have a linear electric potential gradient along the flight axis. The ion beam profile measurements of methyl ions from propane and from 1-butene show a structure which indicates that dissociation occurs from several different excited states, each of which gives methyl ions with characteristic kinetic energies. Author
- Physical Chemistry