W. Foster, M. Shih, P. Pershan
Aug 22, 1996
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Influential Citations
23
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Journal
Journal of Chemical Physics
Abstract
Relaxed Langmuir monolayers of methyl eicosanoate were studied using Brewster angle microscopy (BAM) and grazing incidence x‐ray diffraction (GIXD). The structure of the various phases in this system was determined and compared to previous isotherm and microscopy measurements. At low pressure and low temperature, a crystalline phase with tilt toward nearest neighbor, I(L2″), is observed. At a temperature of ∼14 °C and low pressure there is a transition to a phase with tilt toward next‐nearest neighbor, F(L2′). Finally, as the temperature continues to be raised at low pressure, there is a transition to a phase where the two F(L2′) peaks have the same values of Qxy, here called the τ phase, with a Rotator IV‐like structure. At high pressure and low temperature, an untilted, orthorhombic phase, U′(CS), is observed. As the temperature is increased, a second untilted, orthorhombic phase, U(S), is observed, beginning at ∼12 °C. Above 21 °C and at high pressure, a Rotator‐II‐like phase is seen, with an undistort...