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Surface Premelting of CH4 Thin Films

The translational mobility and the thickness of the surface disordered layer of thin CH4 films adsorbed on MgO(100) have been measured by quasi-elastic neutron scattering below the bulk melting point (90.66 K). The thickness of the quasi-liquid phase varies from one-molecular layer at 72 K to 3.6 layer at 89.4 K for a 10-layer thick film. The corresponding temperature dependence of the translational diffusion coefficient shows that the nature of the “melted” surface layer is probably different from the supercooled liquid.