Existence of a liquid-liquid phase transition inCH3Cl adsorbed on graphite

Author: Grieger S.   Press W.  

Publisher: Edp Sciences

E-ISSN: 1286-4854|33|3|193-198

ISSN: 0295-5075

Source: EPL (EUROPHYSICS LETTERS), Vol.33, Iss.3, 2010-03, pp. : 193-198

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Abstract

A compressed monolayer of $\rm CH_3Cl$ adsorbed on graphite hasbeen examined by X-ray diffraction, EXAFS and molecular-dynamicscalculations (MD). A two-stage melting process with continuous melting in one spatial direction ($T_{\rm m}=147$ K), followed by a second process, which ultimately is discontinuous, has been found. The intermediate liquid state at 147 K156 K, recently suggested on the basis of a specific-heat measurement, has been identified as a liquid-crystal–like phase. It has a high degree of orientational order of the dipolar molecules.