Abstract

Abstract In situ FT-IR external reflection spectra of Langmuir films of stearic acid on the water surface were recorded duing the surface pressure relaxation at two surface areas, corresponding to the liquid condensed (L2) and super-liquid (LS) phases. In the L2 phase, the surface pressure relaxation was minimal and so was the spectral change. In the LS phase, however, the structural change from the trans to gauche conformation was detected.

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