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 heritage and making plans of the total booklet have been defined. The e-book in separate and consecutive volumes used to be basically an issue of administration; the compilation of either volumes used to be performed whilst. there's a specific distinction in subject-matter among either volumes: quantity I includes the basics of the idea, whereas quantity II treats the sensible improvement of the 'trial' -method and the genesis and primary purposes of the Fourier process. within the interval lined by way of Early Papers (1912-1935), the trial strategy results in the winning conquest of buildings 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 designated and prolonged paper of 1935. With this technique the equipment was once accomplished which ended in the current undreamt-of successes of the Fourier strategy within the box of natural chemistry. we now have thought of the inclusion of Robertson's well-known synthesis of the constitution of phtalocyanine (1936). besides the fact that, we made up our minds that its right position will be at first of a booklet which, doubtless, will look in the future, describing this later interval. issues of house prompted us to renounce the bankruptcy on Texture deliberate at first.
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Extra resources for Early Papers on Diffraction of X-rays by Crystals: Volume 2
G. Cox (1932) 113a. W. T. ASTBURY and W. H. BRAGG (1925); h. J. D. BERNAL and D. M. CROWFOOT (1933) - 110. It is possible to construct a table of the 32 classes and tabulate the minimum number of asymmetric [non-parallel] molecules which must necessarily appear in the elementary cell in order to satisfy the symmetry properties of the crystal. [Table not reproduced. ] This number may conveniently be called the 'Symmetry Number' of the crystal class. If it is found that the number of molecules in the unit cell is less than the symmetry number for the crystal, it follows that the molecule must possess some symmetry and that this symmetry is reproduced in the crystal.
1 2 3 Compare Goldschmidt's various publications, especially Geochemische Verteilungs- gesetze der Elemente VII and VIII. 4 J. Am. Chem. Soc. 49 (1927) 765, see also Z. Krist. 67 (1928) 377. 48 A SET OF EMPIRICAL UNIVALENT RADII distances that were not in agreement with the values predicted from Goldschmidts radii. g. 30 A. No other reasonable explanation could be given for the discrepancy than the approximative character of Goldschmidt's radii.
Am. Chem. Soc. 49 (1927) 765, see also Z. Krist. 67 (1928) 377. 48 A SET OF EMPIRICAL UNIVALENT RADII distances that were not in agreement with the values predicted from Goldschmidts radii. g. 30 A. No other reasonable explanation could be given for the discrepancy than the approximative character of Goldschmidt's radii.
Early Papers on Diffraction of X-rays by Crystals: Volume 2 by J.M. Bijvoet, W.G. Burgers, G. Hägg