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- W21118864 abstract "In any evacuated system, the solid surfaces will be covered to an extent depending on their temperature, and the nature and composition of the residual gas. At pressures below about 3 × 10-2 mm and electron paths below 1 cm, an electron is more likely to strike a molecule adsorbed in a monomolecular film than a free molecule of residual gas. Molecules or their fragments liberated as a result of such collision, might be of major importance in many practical devices. We have investigated this effect, using a molybdenum filament in CO. The molybdenum can be cleaned at will by heating and bombarded by an electron stream in which the current and electron energy are controlled independently. The CO is admitted to any desired pressure and the effects are observed in a mass spectrometer in which the experimental filament is mounted. The electron bombardment causes only the O+ion to be liberated with any abundance; it may be from fifty to a hundred times more abundant from the surface than from the space. No CO+nor C+ions are liberated nor any negative ions of CO or its fragments. The efficiency of the O+process is greatest apparently for a monomolecular covering of CO. The observations are complicated by the presence of significant amounts of fluorine and chlorine, which are more tightly bound than CO. The threshold electron energy for liberation of O+ions lies between 25 and 30 V. The dependence on electron current and energy is being studied. The method may be useful in studying the kinetics of adsorption, since the incoming electron beam does not seem to perturb the adsorption strongly. The fluorine and chlorine impurities seem to originate in the molybdenum and would probably have remained undetected by any of the usual methods for studying adsorption." @default.
- W21118864 created "2016-06-24" @default.
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- W21118864 date "2013-01-01" @default.
- W21118864 modified "2023-09-25" @default.
- W21118864 title "The Ionization of Adsorbed Gas by Impact of Slow Electrons" @default.
- W21118864 doi "https://doi.org/10.1016/b978-1-4831-9852-1.50012-8" @default.
- W21118864 hasPublicationYear "2013" @default.
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