Evidence for quasi two-dimensional positronium formation in potassium-intercalated graphite

Details Evidence for quasi two-dimensional positronium formation in potassium-intercalated graphite Evidence for quasi two-dimensional positronium formation in potassium-intercalated graphite

Jun 1987

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987phrvl..58.2363l&link_type=abstract

Physical Review Letters (ISSN 0031-9007), vol. 58, June 1, 1987, p. 2363-2366.

Physics

19

Intercalation, Positronium, Potassium, Pyrolytic Graphite, Angular Correlation, Annihilation Reactions, Brillouin Zones, Crystal Structure

Scientific paper

Two-dimensional angular correlation of annihilation radiation (2D ACAR) experiments have been performed to study the electron-positron momentum densities in potassium-intercalated graphite and highly oriented pyrolytic graphite. Magnetic-field-dependent experiments indicate that the high-intensity, anisotropic 2D ACAR component observed in C24K is at least partially due to quasi-2D positronium formation. In the highly oriented pyrolytic graphite 2D ACAR spectra, a low-intensity, nearly isotropic, thermally activated positronium formation. In the highly oriented pyrolytic graphite 2D ACAR spectra, a low-intensity, nearly isotropic, thermally activated positronium component is found.

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