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- W1986201991 abstract "The diffusive motions of a 0.8 layer of CH4 adsorbed on MgO(100) are measured at 72, 88 and 97 K by quasi-elastic neutron scattering. It is shown that at 72 K the methane film is solid and its molecules perform an isotropic rotational motion. At 88 and 97 K, the adsorbed layer is in a two-dimensional fluid state in which the molecules jump between equidistant (4.21 Å) lattice sites of the MgO surface. The mean residence time has been determined ( ∼ 1 × 10 −10 s at 88 K and ∼ 4 × 10−11 s at 97 K). The corresponding translational diffusion coefficients are ∼ 5 × 10−6 cm2 s−1 at 88 K and 12 × 10−6 cm2 s−1 at 97 K. The diffusivity of this lattice fluid is compared to that of the same molecules adsorbed on graphite (0001) previously reported. The reduced mobility observed in the case of CH4/MgO(100) is related to the important depth of the potential wells on the MgO(100) surface." @default.
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- W1986201991 date "1987-04-01" @default.
- W1986201991 modified "2023-09-25" @default.
- W1986201991 title "Diffusivity of a two-dimensional lattice fluid: CH4 adsorbed on MgO(100)" @default.
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- W1986201991 doi "https://doi.org/10.1016/0039-6028(87)90020-3" @default.
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