Time-domain observation of the slowing-down of positronium in condensed matter

The capability of positron AMOC ( age- momentum correlation) spectroscopy to measure the momentum distribution of annihilating positron-electron pairs as a function of the positron age is used to investigate the slowing-down of positronium in condensed matter. The measured AMOC reliefs are analyzed...

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Bibliographic Details
Published in:Applied surface science 1997-05, Vol.116, p.145-150
Main Authors: Schneider, H., Seeger, A., Siegle, A., Stoll, H., Castellaz, P., Major, J.
Format: Article
Language:English
Subjects:
Condensed matter: electronic structure, electrical, magnetic, and optical properties
Epithermal positronium
Exact sciences and technology
Optical properties and condensed-matter spectroscopy and other interactions of matter with particles and radiation
Other interactions of matter with particles and radiation
Physics
Positron age-momentum correlation
Positron annihilation
Positronium slowing-down/thermalization
Positronium-phonon interaction
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Summary:The capability of positron AMOC ( age- momentum correlation) spectroscopy to measure the momentum distribution of annihilating positron-electron pairs as a function of the positron age is used to investigate the slowing-down of positronium in condensed matter. The measured AMOC reliefs are analyzed in terms of a model that is based on the assumption that Ps thermalization proceeds via inelastic phonon scattering. Quantitative data are presented on the initial kinetic energy of Ps after its formation and the Ps slowing-down time in fused quartz (Suprasil and Herasil), polyvinyltoluene (Pilot-U), tetramethylsilane, and benzene.
ISSN:0169-4332
1873-5584
DOI:10.1016/S0169-4332(96)01044-6