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We report the results of the analysis of the temperature broadening of themomentum distribution of delocalized Positronium (Ps) in Magnesium Fluoride interms of optical deformation-potential scattering model (long-wavelengthoptical phonons). The Ps optical deformation-potential coupling constant$D_{o}$ in MgF$_{2}$ has been determined to be $(1.8\pm0.3)\times10^{9}$ eV/cm.We also show that the Ps momentum distribution is sensitive to second-orderphase transitions in those crystals where optical deformation-potentialscattering is allowed in one and forbidden in another crystalline phase

Nonpolar optical scattering of positronium in magnesium fluoride