Inelastic Neutron Scattering

Inelastic neutron scattering (INS) experiments were undertaken using the TOSCA spectrometer at the ISIS facility. MFM-300(In) was loaded into an 11 mm diameter vanadium sample can and outgassed at 1 × 10^–7 mbar and 100 °C for 1 day. The sample was loaded into a helium closed cycle refrigerator (CCR) cryostat and cooled to 11 K for data collection. H₂ and CH₄ gas were introduced by warming the sample to 50 and 150 K, respectively, and the gas was dosed volumetrically from a calibrated volume. The gas-loaded sample was then cooled to 7 K over a period of 2 h to ensure good mobility of adsorbed D₂ and CD₄ within the crystalline structure of MFM-300(In). The sample was kept at 7 K for an additional half an hour before date collection to ensure the thermal equilibrium.