Analysis of Possible Scattering Processes for Bloch Positronium in Ionic Crystals at Elevated Temperatures

• Authors: I. Bondarev
• Languages of publication: EN

Abstracts

EN

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.

Keywords

EN

78.70.Bj; 71.60.+z; 71.38.+i; 36.10.Dr

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)

• Publisher: Institute of Physics, Polish Academy of Sciences
• Journal: Acta Physica Polonica A
• Year: 2001
• Volume: 99
• Issue: 3-4
• Pages: 337-343

Dates

published

2001-03/04

received

2000-09-18

Contributors

author

I. Bondarev

• The Institute of Nuclear Problems, The Belarusian State University, Bobruiskaya Str. 11, 220050 Minsk, Belarus

References

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Identifiers

DOI

10.12693/APhysPolA.99.337