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Absorbance spectra of polycrystalline samples and twinned crystals of oligothiophenes

机译:多晶样品和寡聚噻吩双晶的吸收光谱

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We propose optical absorption technique at oblique incidence as one of the spectroscopic tools that allow experimentally recognizing the macroscopic order and structural features of molecular solids of conjugated molecules, from single crystals to polycrystalline or twinned samples. We apply this spectroscopy to quaterthiophene as representative of a wide class of materials that usually possess optical transitions of Frenkel exciton origin with strong directional dispersion. The comparison between experimental and simulated data gives evidence of the high sensitivity of this technique for determining quantitatively the polycrystallinity of the measured samples, whose domains may show mirror-like orientation of the unit cell with respect to one of its faces Frenkel exciton; Oligothiophene, Optical properties (c) 2006 Elsevier B.V. All rights reserved.
机译:我们提出倾斜入射的光吸收技术作为一种光谱学工具,该光谱学工具允许实验上识别从单晶到多晶或孪晶样品的共轭分子的分子固体的宏观顺序和结构特征。我们将这种光谱学应用于四噻吩作为代表一类广泛材料的代表,这些材料通常具有Frenkel激子起源的光学跃迁和强烈的方向性色散。实验数据和模拟数据之间的比较表明,该技术可定量测定被测样品的多晶性,具有很高的灵敏度,其结构域可能显示出晶胞相对于其Frenkel激子表面之一的镜状取向。寡噻吩,光学性质(c)2006 Elsevier B.V.保留所有权利。

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