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1 PublicationPositronium formation in nanostructured metals
Čížek, J.; Melikhova, O.; Hruška, P.; Vlček, M.; Anwand, W.; Liedke, M. O.; Novotný, M.; Bulíř, J.
Abstract
Positronium formation in Au films was studied using a magnetically guided continuous slow positron beam with variable energy. Black Au film with porous morphology was compared with conventional smooth Au film. In the smooth Au film positronium is formed on the film surface only. The black Au film exhibits porous sub-surface region containing micro-cavities interconnected with surface. Positronium is formed on inner surfaces of micro-cavities in the sub-surface region and travels through interconnected cavities towards the surface. 3-gamma annihilation of ortho-positronium leaves a clear signature in two-dimensional coincidence Doppler broadening spectra. Measurements of 3-gamma annihilation contribution calculated from single gamma-ray and coincidence Doppler broadening spectra were calculated and compared.
Keywords: Positronium; slow positron beam; porous metals; Au; coincidence Doppler broadening spectroscopy; positron annihilation spectroscopy
Involved research facilities
- Radiation Source ELBE DOI: 10.17815/jlsrf-2-58
- P-ELBE
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- DOI: 10.17815/jlsrf-2-58 is cited by this (Id 26389) publication
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Acta Physica Polonica A 132(2017)5, 1597-1584
DOI: 10.12693/APhysPolA.132.1579
Cited 3 times in Scopus
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