Abstract
With simple modifications improved performance of continuous ion sources in a time of flight mass spectrometer has been obtained. The system was developed for use with heated filament surface ionization sources; however, the advantages of its use with an electron bombardment source seem more significant. With an electron gun operating continuously, a factor of 300 increase in sensitivity over that of the pulsed mode of operation is attained with improved resolution and no increase in the ratio of noise to signal.

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