Abstract The theory of the propagation of light along the axis of a cholesteric liquid crystal is considered. Two models have been used so far, viz., the spiralling dielectric ellipsoid model of Oseen, treated theoretically by de Vries, and the twisted pile of birefringent plates treated according to the dynamical theory by Chandrasekhar and Srinivasa Rao. The two models appear to give different results at long wavelengths, and the former seems inapplicable in the region of total reflection. In this paper, an exact solution of the Oseen model is found, which may be used in the entire range of wavelengths, and has a simple physical interpretation. Secondly, the model of Chandrasekhar and Srinivasa Rao is shown to agree with this solution. The approximations implicit in the work of these authors and that of de Vries are clearly brought out. A numerical example illustrating the features of the exact solution is given.

Rajaram Nityananda

Molecular crystals and liquid crystals

MOLECULAR CRYSTALS AND LIQUID CRYSTALS 成立于 1966 年，是世界领先的期刊，在三个专业领域发表实验和理论性质的原创研究论文：液晶、分子晶体和低维固体。这些涵盖但不限于：液晶：-电光和磁光现象；热力学；相变；结构体;核磁共振和取向控制光谱；理论。分子晶体：-光谱学；能量和电荷转移；固态反应；光和辐射效应低维固体：结构、电子、磁性和光学特性；运输机制杂志发表研究论文、评论论文和书评。在所有三个领域，将考虑描述制备和特性的实验手稿。不鼓励仅描述晶体结构测定的论文，除非某些固态力（氢键、电荷转移等）发挥重要作用和/或测量材料的某些固态特性。

Molecular Crystals and Liquid Crystals, established in 1966, is a leading journal worldwide that publishes original research papers on experimental and theoretical properties in three specialized areas: liquid crystals, molecular crystals, and low-dimensional solids. Topics covered include, but are not limited to: liquid crystals - electro-optic and magneto-optic phenomena; thermodynamics; phase transitions; structural bodies; nuclear magnetic resonance and orientation-controlled spectroscopy; theory. Molecular crystals - spectroscopy; energy and charge transfer; solid-state reactions; light and radiation effects. Low-dimensional solids - structural, electronic, magnetic, and optical properties; transport mechanisms. The journal publishes research articles, review papers, and book reviews. In all three areas, experimental manuscripts describing preparation and characteristics will be considered. Papers that only describe crystal structure determinations are discouraged unless certain solid-state forces (such as hydrogen bonding, charge transfer, etc.) play a significant role and/or certain solid-state properties of the materials are measured.

《Molecular Crystals and Liquid Crystals》成立于1966年，是全球领先的期刊，专注于液晶、分子晶体和低维固体三个领域，发表原创的实验和理论研究论文。涉及的主题包括但不限于：液晶的电光和磁光现象、热力学、相变、结构体、核磁共振及取向控制光谱等；分子晶体的光谱学、能量和电荷转移、固态反应、光和辐射效应等；低维固体的结构、电子、磁性和光学特性以及运输机制等。期刊接受研究论文、评论和书评。在上述三个领域，实验手稿的描述和特性研究将被考虑。仅描述晶体结构测定的论文不被鼓励，除非涉及重要的固态力（如氢键、电荷转移等）或测量材料的某些固态特性。

Category	Quartile
化学	4
化学, 化学综合	4
化学, 晶体学	4
化学, 材料科学综合	4

On the Theory of Light Propagation in Cholesteric Liquid Crystals

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Category	Quartile
MATERIALS SCIENCE, MULTIDISCIPLINARY	4