- Tytuł:
- Analysis of Possible Scattering Processes for Bloch Positronium in Ionic Crystals at Elevated Temperatures
- Autorzy:
- Bondarev, I. V.
- Powiązania:
- https://bibliotekanauki.pl/articles/2024215.pdf
- Data publikacji:
- 2001
- Wydawca:
- Polska Akademia Nauk. Instytut Fizyki PAN
- Tematy:
-
78.70.Bj
71.60.+z
71.38.+i
36.10.Dr - Opis:
- 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$\text{}_{2}$ 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$\text{}_{2}$ is predicted for crystalline quartz above the temperature of (α-β)-phase transition.
- Źródło:
-
Acta Physica Polonica A; 2001, 99, 3-4; 337-343
0587-4246
1898-794X - Pojawia się w:
- Acta Physica Polonica A
- Dostawca treści:
- Biblioteka Nauki
Artykuł