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  • 1
    Electronic Resource
    Electronic Resource
    [S.l.] : International Union of Crystallography (IUCr)
    Acta crystallographica 25 (1969), S. 455-459 
    ISSN: 1600-5724
    Source: Crystallography Journals Online : IUCR Backfile Archive 1948-2001
    Topics: Chemistry and Pharmacology , Geosciences , Physics
    Notes: It is argued that magnetic structures are likely to be found which will most fruitfully be explained with the aid of non-crystallographic magnetic point groups. The point groups are classified into families of `halving subgroups' and it is shown diagrammatically, with the aid of representation theory, how non-crystallographic Shubnikov groups can be constructed.
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    [S.l.] : International Union of Crystallography (IUCr)
    Acta crystallographica 27 (1971), S. 76-79 
    ISSN: 1600-5724
    Source: Crystallography Journals Online : IUCR Backfile Archive 1948-2001
    Topics: Chemistry and Pharmacology , Geosciences , Physics
    Notes: Tables are presented whereby physically relevant differences in the relationship of the elements of symmetry of a Wyckoff site to those of the crystal class can be distinguished.
    Type of Medium: Electronic Resource
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  • 3
    Electronic Resource
    Electronic Resource
    [S.l.] : International Union of Crystallography (IUCr)
    Acta crystallographica 28 (1972), S. 172-178 
    ISSN: 1600-5724
    Source: Crystallography Journals Online : IUCR Backfile Archive 1948-2001
    Topics: Chemistry and Pharmacology , Geosciences , Physics
    Notes: Supergroup tables are presented whereby a representation of a subgroup can be correlated with those representations of the supergroup which are obtained on ascent in symmetry. The method of derivation is explained and various orientations of the subgroup with respect to the supergroup considered. The tables also include the correlations between the double-valued representations of the corresponding double groups.
    Type of Medium: Electronic Resource
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  • 4
    Electronic Resource
    Electronic Resource
    [S.l.] : International Union of Crystallography (IUCr)
    Acta crystallographica 28 (1972), S. 485-489 
    ISSN: 1600-5724
    Source: Crystallography Journals Online : IUCR Backfile Archive 1948-2001
    Topics: Chemistry and Pharmacology , Geosciences , Physics
    Notes: A complete list of the zellengleichen supergroups of the 230 Fedorov space groups is presented.
    Type of Medium: Electronic Resource
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  • 5
    Electronic Resource
    Electronic Resource
    [S.l.] : International Union of Crystallography (IUCr)
    Acta crystallographica 28 (1972), S. 489-493 
    ISSN: 1600-5724
    Source: Crystallography Journals Online : IUCR Backfile Archive 1948-2001
    Topics: Chemistry and Pharmacology , Geosciences , Physics
    Notes: A list of physically significant klassengleichen subgroups and supergroups of the 230 space groups is presented with a discussion of the criteria governing the limitations on the allowed changes in volume of the unit cell.
    Type of Medium: Electronic Resource
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  • 6
    Electronic Resource
    Electronic Resource
    [S.l.] : International Union of Crystallography (IUCr)
    Acta crystallographica 37 (1981), S. 143-143 
    ISSN: 1600-5724
    Source: Crystallography Journals Online : IUCR Backfile Archive 1948-2001
    Topics: Chemistry and Pharmacology , Geosciences , Physics
    Type of Medium: Electronic Resource
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  • 7
    Electronic Resource
    Electronic Resource
    [S.l.] : International Union of Crystallography (IUCr)
    Acta crystallographica 29 (1973), S. 353-357 
    ISSN: 1600-5724
    Source: Crystallography Journals Online : IUCR Backfile Archive 1948-2001
    Topics: Chemistry and Pharmacology , Geosciences , Physics
    Notes: When describing a crystal structure in terms of the Wyckoff sites occupied, equivalent alternatives often arise because the choice of origin of coordinates is subject to arbitrariness remaining within the standard choice in International Tables for X-ray Crystallography. The problem is explained and simple tables which enable any crystal structure to be described in any of the alternative ways are presented. Reference is made to the analogous problem in the theory of lattice complexes.
    Type of Medium: Electronic Resource
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  • 8
    Electronic Resource
    Electronic Resource
    [S.l.] : International Union of Crystallography (IUCr)
    Acta crystallographica 34 (1978), S. 478-479 
    ISSN: 1600-5724
    Source: Crystallography Journals Online : IUCR Backfile Archive 1948-2001
    Topics: Chemistry and Pharmacology , Geosciences , Physics
    Type of Medium: Electronic Resource
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  • 9
    Electronic Resource
    Electronic Resource
    New York, NY : Wiley-Blackwell
    International Journal of Quantum Chemistry 1 (1967), S. 595-604 
    ISSN: 0020-7608
    Keywords: Computational Chemistry and Molecular Modeling ; Atomic, Molecular and Optical Physics
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: On discute le calcul des polarisabilités des molécules sphériques du point de vue de l'approximation de l'énergie d'excitation moyenne de la théorie des perturbations. On démontre que, tandis qu'on peut toujours obtenir de l'information sur l'énergie dans des champs externes des phénomènes de polarisation, on peut aussi obtenir un peu d'information sur la fonction d'onde non perturbée de la susceptibilité magnétique et de l'effet Cotton-Mouton. Dans le cas de l'argon ces informations-ci s'accordent aux résultats des calculs SCF. On prédit les constantes de Cotton-Mouton pour le krypton et le xénon.
    Abstract: Die Berechnung der Polarisierbarkeiten sphärischer Moleküle wird im Lichte der Mittelanregungsenergieannäherung der Störungstheorie diskutiert. Es wird gezeigt dass, während Information von der Energie in äusseren Feldern immer aus Polarisationser-scheinungen erhalten werden kann, gewisse Information von der ungestörten Wellenfunktion auch aus magnetischen Susceptibilitäts und Cotton-Mouton Effektmessungen erhalten werden kann. Für Argon stimmte solche Information mit SCF-Berechnungen überein. Die Cotton-Mouton-Konstanten für Krypton und Xenon werden vorhergesagt.
    Notes: The calculation of the polarizabilities of spherical molecules is discussed in the light of the average excitation energy approximation to perturbation theory. It is shown that whilst information about the energy in external fields can always be obtained from polarization phenomena, some information about the unperturbed wave function also can be obtained from magnetic susceptibility and Cotton-Mouton effect measurements. In the case of argon such information was found to agree with the results of self-consistent-field calculations. Predictions of the Cotton-Mouton constants of krypton and xenon are made.
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
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  • 10
    Electronic Resource
    Electronic Resource
    New York, NY : Wiley-Blackwell
    International Journal of Quantum Chemistry 6 (1972), S. 919-924 
    ISSN: 0020-7608
    Keywords: Computational Chemistry and Molecular Modeling ; Atomic, Molecular and Optical Physics
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: After a brief discussion of progress in the theory of icosahedral molecules, the terms arising from simple electronic configurations are deduced from tables of symmetrized powers of representations previously published by the author.
    Additional Material: 4 Tab.
    Type of Medium: Electronic Resource
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