Molecular Orientation in Mixed Monolayers of Hemicyanine and Fatty Acid at an Air/Water Interface Studied by Second Harmonic Generation

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Abstract
The molecular orientation of mixed monolayers consisting of hemicyanine dye and arachidic acid at an air/water interface is studied by optical second harmonic generation. It was found that the average molecular tilt angle with respect to the surface normal is almost unchanged throughout the compression process, and is smaller in a monolayer containing a higher fraction of hemicyanine. The effective local field factor was also evaluated as a function of surface number density and was found to agree qualitatively with the theoretical prediction.