アモルファス状態の氷およびクラスレート水和物の構造とダイナミクス

低温科学

Amorphous ice and clathrate hydrates of Xe and SF6 were prepared using our homemade cryostat for vapordeposited samples. Neutron diffraction,small-angle scattering, and inelastic scattering measurements of the prepared samples revealed a cage-like local structure in amorphous clathrate hydrates, structural relaxation far below Tg, accompanying structural ordering around the second nearest neighbors, and density homogenization of a 30 A°order. The present experiments also clarified the relationship between low-energy excitation (boson peak) and the ordering of the hydrogen-bonded systems.