Ammonia borane, NH3BH3, has been extensively studied as a potential hydrogen storage material because of its high hydrogen content (19.6wt%) and relatively low decomposition temperature (<150oC) for the first molar equivalent of hydrogen. Recently, alkali-metal substituted derivatives of ammonia borane, such as LiNH2BH3 and NaNH2BH3 and KNH2BH3 have been synthesised and shown to have a number of improved hydrogen storage properties. Recent examination of LiNH2BH3, and the iso-structural NaNH2BH3, on TOSCA (RB820464) have shown excellent resolution with particular very good agreement between the calculated and experimental structures of LiNH2BH3. We wish now to investigate these coumpounds by neutron spectroscopy as a function of temperature, which will provide significant information as to the mechanism of decomposition.