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Languages of publication
Abstracts
The role of nonpolar optic phonon scattering and of umklapp acoustic phonon scattering is analyzed for a delocalized positronium atom in ionic crystals at elevated temperatures. At temperatures above which they become essential both of these scattering mechanisms contribute to the imaginary self-energy of positronium renormalizing its acoustic deformation potential constant. It was such a renormalization that was recently observed experimentally for delocalized positronium in MgF_2 crystal. We put forward the theoretical explanation of these experiments based upon the model of nonpolar optic phonon scattering of positronium. An effect analogous to that observed in MgF_2 is predicted for crystalline quartz above the temperature of (α-β)-phase transition.
Discipline
- 71.60.+z: Positron states(for positron annihilation, see 78.70.Bj)
- 78.70.Bj: Positron annihilation(for positron states, see 71.60.+z in electronic structure of bulk materials; for positronium chemistry, see 82.30.Gg in physical chemistry and chemical physics)
- 36.10.Dr: Positronium(see also 82.30.Gg Positronium chemistry)
Journal
Year
Volume
Issue
Pages
337-343
Physical description
Dates
published
2001-03/04
received
2000-09-18
Contributors
author
- The Institute of Nuclear Problems, The Belarusian State University, Bobruiskaya Str. 11, 220050 Minsk, Belarus
References
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Document Type
Publication order reference
Identifiers
YADDA identifier
bwmeta1.element.bwnjournal-article-appv99n304kz