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- W1985485082 abstract "The use of specular reflection of X-rays to study the structure of the liquid/vapour interfaces along the direction normal to the surface is described. If RF(θ) is the theoretical Fresnel reflection law for X-rays incident on an ideal flat surface at an angle θ, and R(θ) is the measured reflectivity from the true surface, the ratio R(θ)/RF(θ) is a measure of the electron density along the surface normal; i.e.R(θ)//RF(θ)≈|1//p∞∫∂〈p(z)〉//∂z exp (iQzz) dz|2. where p∞ is the electron density far from the surface, ∂〈p(z)〉/∂z is the gradient of the average electron density along the surface normal and Qz=(4π/λ) sin (θ). For simple liquids p–1∞∂〈p〉/∂z≈[1/√(2πσ2)] exp (–z2/2σ2), and R(θ)/RF(θ)≈ exp (–Q2σ2), where σ2 is dominated by the mean-square average of thermally excited fluctuations in the height of the surface. For liquid crystals and for lyotropic miceller systems temperature-dependent structure in R(θ) is due to surface-induced layering in 〈p(z)〉. Other experimental results from thin layers of liquid 4He and monolayers, of amphiphathic molecules on the surface of H2O will be described. The possibility of complementing specular reflectivity measurements of surface roughness by studying diffuse scattering at small angles off of the specular condition will also be illustrated with results from the H2O surface." @default.
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- W1985485082 date "1990-01-01" @default.
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- W1985485082 title "Structure of surfaces and interfaces as studied using synchrotron radiation. Liquid surfaces" @default.
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- W1985485082 doi "https://doi.org/10.1039/dc9908900231" @default.
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