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- W77936905 abstract "Summary Observations on the adsorption and desorption of the inert gases on various metals and also on glass surfaces have been made under high-vacuum conditions. By using a mass spectrometer to observe the desorption characteristics it has been found possible to follow the slow desorption of one gas against a large background of some other gas. Adsorption on the metals was brought about by bombarding the surfaces with ions of the inert gases with energies up to 5000 eV. In the case of the glass, observations were made on the take up of gas on the envelope of a Bayard–Alpert ionization gauge. For both glass and metal targets the desorption characteristic on subsequent heating was used as a measure of the adsorption. Results obtained for the metals—notably tungsten, nickel and platinum—show that the quantity of gas taken up increases with increasing energy of the bombarding ions to such a value as to be equivalent to a complete surface layer for an energy of 5000 eV. Temperatures of the order of 700 to 800°K are required to remove the adsorbed gas, thus showing binding energies much higher than for physical adsorption. It has also been noted that the ions can dislodge, and take the place of, molecules already adsorbed at the surface. The ion bombardment was also found to allow the release of impurities such as potassium and sodium from the metal targets. This was especially true for tungsten, where after a bombardment of ions a subsequent heating produced a short burst of potassium and sodium positive ions from the target surface. No quantitative measurements of the intensities or energies of the incident ions on the glass surfaces have yet been undertaken. It has been shown, however, that adsorption takes place, again with comparatively large binding energies, which does not appear to be constant over all the adsorption sites. In order to release all the inert gas molecules from the surface baking temperatures in the range 500–600°K must be used, corresponding to heats of desorption of the order of 20 kcal/mole." @default.
- W77936905 created "2016-06-24" @default.
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- W77936905 date "1959-01-01" @default.
- W77936905 modified "2023-09-27" @default.
- W77936905 title "ADSORPTION AND DESORPTION OF GASES IN THE IONIZED STATE ON METAL AND GLASS SURFACES" @default.
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- W77936905 doi "https://doi.org/10.1016/b978-0-08-009210-2.50044-4" @default.
- W77936905 hasPublicationYear "1959" @default.
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