A three-band model which consists of one σ→σ* and two major π→π* electronic transitions was developed to account for the birefringence dispersion of a uniaxial liquid crystal. By comparing theory with experimental results, the contribution of each band to the overall birefringence is evaluated. The effect of each band on birefringence dispersion depends strongly on the conjugation length of the molecule. This model reveals new physical insights for designing a liquid-crystal molecule with desirable birefringence.
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Wu et al. (1989) studied this question.
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