The proposed experiment will study how material properties change as a function nitridation (eg. the incorporation of nitrogen gas into the material). In previous study at RAL, we found that a pellet of CaH2 when exposed to nitrogen gas showed a dramatic increase in conductivity of hydride ions (H-). We will use quasi-elastic neutron spectroscopy to study how the local ionic motion of H- changes as a result of nitridation. This experiment will inform us about the kinetics of reversible hydrogen uptake and release with applications in hydrogen storage systems. Furthermore, the high conductivity of the material makes it applicable in next-gen fuel cell systems.