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The structure of a monolayer of pentadecanoic acid near the liquid-expanded--liquid-condensed phase transition at a water-air interface is studied by optical second-harmonic generation. The results show that this transition is accompanied by a reorientation of the molecules and that the two phases are separated by an inhomogeneous coexistence region on the isotherms.
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Rasing et al. (1985) studied this question.
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