Study of linear and nonlinear dielectric properties of monolayers by Maxwell-Displacement Current and optical second harmonic generation measurements

In order to clarify the dielectric properties of organic monolayers at the air-water interface, the formula of polarization of organic monolayers with C/sub /spl infin/v/ symmetry have been derived, using orientational order parameters expressed by Legendre polynomials. It is shown that Maxwell Displacement Current (MDC) measurement coupled with optical second harmonic generation (SHG) measurement is helpful for the determination of these orientational order parameters. Monolayers of liquid crystals on the air-water interface were examined during monolayer compression and the orientational order parameters were determined.