Abstract
Positron lifetime measurements have been made on graphite powders, grafoils, and pyrolytic graphite crystals with different surface areas in the temperature range between 25° and 600 °C. Three positron lifetimes were found in these systems: a short-lived component (∼0.2 ns) due to positrons in the bulk; a component (∼0.45 ns) due to surface-trapped positrons; and a long-lived component (∼2 ns) ofo-Ps in the voids or the interfacial spaces of powders. Both bulk and surface positron lifetimes increase as a function of temperature. Correlations between the intensity of surface-trapped positrons and the surface area and between Ps formation and the surface area of graphite are found. The Ps formation probability increases as a function of temperature. A thermal desorption model interprets the emission process of Ps atoms from the surface of graphite to the vacuum and gives an activation energy of 0.23±0.02 eV.
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Preliminary results of this paper were presented at the March Meeting of American Physical Society, Los Angeles. Bull. Am. Phys. Soc.28, 347 (1983)
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Jean, Y.C., Venkateswaran, K., Parsai, E. et al. Temperature dependence of positron annihilation characteristics on the surfaces of graphite powders. Appl. Phys. A 35, 169–176 (1984). https://doi.org/10.1007/BF00616971
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DOI: https://doi.org/10.1007/BF00616971