12 December 2002 Photoinduced reorientation phenomena in dyed liquid crystals: recent steps toward a complete understanding of the underlying mechanism
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Abstract
A survey of recent results of experiments aimed at understanding the basic mechanism of the photoinduced reorientation phenomena in dye-doped liquid crystals is presented. In particular, I shall focus on experiments based on the isotopic substitution of hydrogen atoms with deuterium in dye molecules, which have shown an unexpected enhancement of the photoinduced reorientation effect by a factor two. The isotopic substitution also changes the dye excited state lifetime and orientational diffusion times. These results are in good agreement with the model proposed for the effect, and confirm the hypothesis that the active photoexcited state in the photoinduced reorientation phenomena is simply the first-excited singlet electronic state of dye molecules.
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Lorenzo Marrucci, "Photoinduced reorientation phenomena in dyed liquid crystals: recent steps toward a complete understanding of the underlying mechanism", Proc. SPIE 4799, Liquid Crystals VI, (12 December 2002); doi: 10.1117/12.453279; https://doi.org/10.1117/12.453279
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