Effects of Initial Energies on Mass Spectra

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Abstract
The slit system of a conventional mass spectrometer discriminates against ions having initial kinetic energies. Relations between the amount of the discrimination and the geometry of the system are developed and confirmed experimentally for ions having only thermal energy. Curves showing the discrimination against high energy fragments from a number of simple molecules are given. These curves show that measured relative abundances depend strongly on the geometry of the system and on the accelerating voltage.