Electronic absorption spectra of symmetric cationic dye in constant electric field

The electronic absorption coefficient of polymer films doped with symmetric cationic polymethine dye external electric field constant changes is researched. This effect is characterised by the short-wavelength band edge intensity increases and it decreases on the long-wavelength edge. The dye cation charge distribution in the model electric field 108 V m−1 of point charges was calculated by the method AM1. On the basis of the quantum chemical calculations the spectral regularities in electric field is interpreted by the cation electronic charge changes. The theoretical model, based on the eigenfrequencies value changes of the charged anharmonic oscillators under operation field is offered for the observed effects description. The experimental spectra well correlate with the theoretically calculated.