Abstract
The specially designed ion source of mass spectrometer has been used to measure simultaneously both ions formed by electron impact and by self surface ionization, and from these measurements the work functions and the heats of sublimation of atoms and positive ions of rhenium, tantalum and tungsten have been determined. These values obtained are 5.62±0.08, 7.94±0.20and10.19±0.28eV for rhenium, 5.02±0.11, 8.04±0.12and10.90±0.23eV for tantalum, and 5.04±0.29, 9.28±0.27 and 12.22±0.56eV for tungsten, respectively.
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