Abstract
The direction and the magnitude of the change in electric dipole moment (Δμ) and in polarizability associated with excitation into S 1 of chromophoric oxacyanine are determined at different concentrations in mixed Langmuir-Blodgett (LB) monolayer films, based on the Stark shift evaluated from the so-called electrochromism. A molecular complex of chromophoric oxacyanine whose direction of Δμ is opposite to the one of dimer or J-aggregate is newly found at a high concentration in mixed LB films.
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