X-ray Scattering Study of the Melting Transition of a CCl4 Monolayer on Graphite
Résumé
We have performed an extensive X-ray scattering study of 0.85 monolayer of carbon tetrachloride adsorbed on graphite with a rotating anode X-ray generator. By using a position sensitive detector, we were able to study simultaneously two diffraction peaks during the whole melting transition. A measure of the Debye-Waller correlation function coefficient, ηQB, based on peak broadening was performed for the two peaks in the solid regime. The proportionality law between these two coefficients has been verified, with a fairly good agreement and it confirms the quasi-long-range order in the solid. At melting, the coefficient ηQB for the first peak is equal to 0.23, a value compatible with previous experimental work and standard theory. The intensities of the diffraction peaks exhibit variations with ηQB and coherence length which are in agreement with theoretical predictions in both solid and liquid regimes.
Domaines
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