@article{oai:nagoya.repo.nii.ac.jp:00010189,
 author = {Sakata, M. and Aoyagi, S. and Ogura, T. and Nishibori, E.},
 issue = {1},
 journal = {AIP Conference Proceedings},
 month = {Jan},
 note = {Since the advent of the 3rd generation Synchrotron Radiation (SR) sources, such as SPring-8, the capabilities of SR powder diffraction increased greatly not only in an accurate structure refinement but also ab initio structure determination. In this study, advanced structural analyses by 3rd generation SR powder diffraction based on the Large Debye-Scherrer camera installed at BL02B2, SPring-8 is described. Because of high angular resolution and high counting statistics powder data collected at BL02B2, SPring-8, ab initio structure determination can cope with a molecular crystals with 65 atoms including H atoms. For the structure refinements, it is found that a kind of Maximum Entropy Method in which several atoms are omitted in phase calculation become very important to refine structural details of fairy large molecule in a crystal. It should be emphasized that until the unknown structure is refined very precisely, the obtained structure by Genetic Algorithm (GA) or some other ab initio structure determination method using real space structural knowledge, it is not possible to tell whether the structure obtained by the method is correct or not. In order to determine and/or refine crystal structure of rather complicated molecules, we cannot overemphasize the importance of the 3rd generation SR sources.},
 pages = {1829--1832},
 title = {Advanced Structural Analyses by Third Generation Synchrotron Radiation Powder Diffraction},
 volume = {879},
 year = {2007}
}