高温Wフィラメントと酸素の相互作用 : 測定系管壁の効果

概要

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The interaction of oxygen with a hot tungsten filament was studied by the technique of isotopic mixing. The tungsten filament placed in the center of a spherical glass cell was flashed in isotopic oxygen 1802 of 10-6 Torr. The cell wall was kept at several constant temperatures during the flashing. Isotopic carbon monoxide C 18O observed at the inital stage rapidly diminishes within 30 min. At the next stage the increase of isotopic gases C18O2, C18OO, C180 and CO are observed, but they begin to decrease after 6090 min. Moreover, the evolution of these gases are decreased to a large extent by cooling the cell wall to lower temperature such as-72°C. It is concluded from these results that isotopic carbon monoxide and carbon dioxide are produced from the surface of the glass cell rather than caused by the interaction of oxygen with the hot tungsten surface with the exception of the initial stage.
日本真空協会の論文