Abstract

An experimental instrument equipped with the Maxwell displacement current (MDC) and optical second-harmonic generation measurement system has been developed for the study of the dielectric property of organic monolayers on the surface of water. In this instrument, the generation of MDC across monolayers is recorded by monolayer compression. At the same time, second-harmonic signals generated from monolayers by the laser irradiation are monitored. Using this experimental instrument, the orientational order of 4-octyl-4′-n-cyanobiphenyls monolayers was examined, and one of the most important parameters to characterize the physical properties of monolayers, the orientational order parameters S1 and S3 defined by Legendre polynomials, was determined.

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