Abstract
The role of optical deformation-potential scattering is studied for the delocalized positronium atoms in ionic crystals. At high temperatures, when the scattering becomes substantial, it (unless forbidden by the selection rules) renormalizes the positronium-acoustic phonon coupling constant. Such a renormalization was experimentally justified by measuring the momentum distribution for a delocalized positronium in the MgF2 crystal. A similar effect is predicted for a positronium in crystalline quartz at temperatures above the transition from α-to β-quartz (846 K).
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Translated from Pis’ma v Zhurnal Éksperimental’no\(\overset{\lower0.5em\hbox{$\smash{\scriptscriptstyle\smile}$}}{l} \) i Teoretichesko\(\overset{\lower0.5em\hbox{$\smash{\scriptscriptstyle\smile}$}}{l} \) Fiziki, Vol. 72, No. 9, 2000, pp. 673–678.
Original Russian Text Copyright © 2000 by Bondarev.