The validity of the local-field approximation (LFA) has been tested in hemicyanine dye Langmuir–Blodgett monolayers. Resonant structures of absorption and the second-harmonic generation revealed that LFA is adequate to describe the second-harmonic generation in the monolayers even when the intermolecular interaction is very strong (H aggregate). A simple calculation procedure is also presented which enables one to treat monolayers as a macroscopic object in a consistent manner with the microscopic structure.
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Ui et al. (1994) studied this question.
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