By J.M. Bijvoet, W.G. Burgers, G. Hägg
In the Preface to Early Papers on Diffraction of X-rays through Crystals quantity I (containing Chapters I-V and released in 1969), the historical past and making plans of the full e-book have been defined. The book in separate and consecutive volumes was once basically a question of administration; the compilation of either volumes used to be performed whilst. there's a specified distinction in subject-matter among either volumes: quantity I includes the basics of the speculation, whereas quantity II treats the sensible improvement of the 'trial' -method and the genesis and primary functions of the Fourier technique. within the interval coated via Early Papers (1912-1935), the trial procedure results in the profitable conquest of constructions with as much as 100 parameters. We finish the publication with Patterson's discovery (1934) of the p2-series as defined in his moment, extra certain and prolonged paper of 1935. With this technique the gear used to be accomplished which resulted in the current undreamt-of successes of the Fourier procedure within the box of natural chemistry. we've thought of the inclusion of Robertson's well-known synthesis of the constitution of phtalocyanine (1936). although, we made up our minds that its right position will be at first of a e-book which, without doubt, will seem at some point, describing this later interval. concerns of house triggered us to renounce the bankruptcy on Texture deliberate at first.
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Extra info for Early Papers on Diffraction of X-rays by Crystals: Volume 2
Thus, if n is the number characteristic of the class and m the number per unit cell, then n/m is an integer and the crystal shares n/m fold symmetry with the molecule. This number may be called the Symmetry Number of the molecule [see paper 111 for an example]. So far it has not been claimed that the number of molecules given by the table described in our first paragraph is the actual number present when the molecule is asymmetric, but only that the number in the cell must be either this number or an integral multiple of it.
The full ones are as just described, while the dotted ones bear a similar relation to the plane halfway down the cell-that is, they can be obtained from the standard molecule by the operation of a symmetry element perpendicular to the plane of the paper and involving a translation of e/2. The authors wish to express their indebtedness to Sir WM. BRAGG for his unfailing encouragement and advice. 106. Die bisher tibliche Symbolik der Raumgruppen nach Schoenflies hat den Nachteil, daB die verschiedenen Raumgruppen, die derselben Kristallsymmetrie isomorph sind, einfach laufend durchnumeriert werden, ohne daB man ihre charakteristischen Symmetrieelemente aus dem Symbol erkennen kann.
Der erste Vormittag brachte bereits eine fUr alles Weitere sehr wichtige Entscheidung, namlich die Einigung auf eine gemeinsame rationelle Raumgruppennomenklatur fUr die Zwecke des ins Auge gefaBten Tabellenwerks. Sie folgt bis auf eine kleine Abiinderung dem Vorschlag, der auf Grund der Bezeichnungssysteme von Hermann und von Mauguin den Teilnehmern zugestellt worden war. Uber diese Nomenklatur wird Herr Mauguin demnachst berichten. Es wird gehofft, daB die rationelle N omenklatur sich im Laufe der Zeit durchsetzt; in den Tabellen wird daneben die Schoenflies'sche Bezeichnung angegeben.
Early Papers on Diffraction of X-rays by Crystals: Volume 2 by J.M. Bijvoet, W.G. Burgers, G. Hägg