We request 4 days on IRIS to study the temperature dependance of the structural dynamics in amorphous sodium-ammonia (Na-NH3). This will be the first investigation of the structural dynamics of these phases, and continues our successful studies at ISIS into these intriguing electronic systems. Through the determination of discontinuities in the spatially averaged mean squared displacements of protons, we will be able to identify transition points in the dynamics of our amorphous systems as the temperature is raised