Most researchers would relate X-ray structure analysis to crystal structure analysis. A crystal is a state in which atoms or molecules are regularly arranged in three-dimensional space. However, some substances do not have 3D structures, but have 1D, 2D, 1D1D, 2D1D or 1D1D1D structures. Here the symbol stands for direct sum in linear algebra and is different from ordinary sum +. For example, 2D1D means the direct sum of a 2D subspace and an orthogonal 1D subspace, not 3D.In a previous book, Physics and Chemistry of Molecular Assemblies, published in April 2020, the author showed for the first time that molecular assemblies can be represented in a unified manner from such subspaces of linear algebra, and wrote the theory and method of X-ray structure analysis of the liquid crystal phase structures with the dimensional structure of 1D, 2D, 1D1D, 2D1D, and 1D1D1D. Furthermore, the X-ray liquid crystal structure analysis methods of 11 representative examples were concretely described. In addition, 110 X-ray data were posted as the end-of-chapter problems in Chapter 3.Using the methods developed by the author, these 110 problems can be solved in principle with a calculator, graph paper, a ruler, and a compass, although it takes time. However, when you use only a calculator, a graph paper, a ruler or a compass, it would probably take more than one year to analyze all the observed X-ray data in Chapter 3. Therefore, the author's research group has developed a computer program named 'Bunseki-kun.' By using this program, we can easily analyze the liquid crystal phase structures from the observed d spacings. Thus, when you use this program, you will be able to analyze the liquid crystal phase and other soft matter phase structures within 1/100th to 1/1000th of the time. Those who purchase this book will be able to freely download this program from the following URL set by the publisher.
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