Abstract
The polarized IR absorption spectra of monodomain planar-oriented films of a discotic liquid crystal Dho are obtained for the first time. The spectral effects induced by the resonance dipole-dipole interaction of molecules, which have been predicted earlier, were observed. It was found that molecular excitations in isotropic and liquid-crystal phases are mixed due to local-filed effects and this mixing affects the relative intensity and dichroism of the absorption bands. New methods were suggested for measuring the local-field parameters in the Dho phase from intensities and positions of the polarized absorption bands taking into account the mixing of molecular excitations. The two-dimensional crystal lattice of molecular columns was shown to reduce the local-field anisotropy of this phase.
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