Abstract
Abstract The thermal ion emission characteristics of graphite have been studied. The intensities of the ions M2BO+2 and M2Cl+ were greatly enhanced by coating the filament with graphite. This is because the ionization potentials of these ions were decreased. The graphite characteristics have been applied to isotopic determination of boron by thermal ionization mass spectrometry. It is possible to develop a high precision isotopic measurement of chlorine by using the technique of loading graphite.
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