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  • 1995-1999  (14)
  • 1990-1994  (27)
  • 1980-1984  (33)
  • 1
    Electronic Resource
    Electronic Resource
    Unoccupied electronic structure of phthalocyanine films (1990)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 93 (1990), S. 6859-6864 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: The unoccupied molecular orbitals of metal-free phthalocyanine (H2PC), nickel-phthalocyanine (NiPC), and copper-phthalocyanine (CuPC) adsorbed on single crystal surfaces have been studied by inverse photoemission spectroscopy (IPES) and near-edge x-ray absorption spectroscopy (NEXAFS). The features observed in the experimental data are assigned by reference to molecular orbital calculations. Carbon and nitrogen 1s NEXAFS measurements of NiPC adsorbed on Cu(110) surface indicates that the phthalocyanine molecular planes are parallel to the surface. X-ray absorption data recorded at the Ni LIII and LII edges show that the unoccupied Ni 3d level is located in the plane of the phthalocyanine rings.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.458918
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  • 2
    Electronic Resource
    Electronic Resource
    Flat points of minimal balance surfaces (1990)
    [S.l.] : International Union of Crystallography (IUCr)
    Acta crystallographica 46 (1990), S. 33-40 
    Details
    ISSN: 1600-5724
    Source: Crystallography Journals Online : IUCR Backfile Archive 1948-2001
    Topics: Chemistry and Pharmacology , Geosciences , Physics
    Notes: The symmetry conditions for flat points of minimal surfaces have been studied in relation to the order β of points on such surfaces. Using symmetry aspects, a set of rules for the derivation of fiat points have been developed. By means of these rules the flat points for the 45 families of minimal balance surfaces known so far have been determined. As a check for completeness the relation between the genus of a minimal surface and the orders of its flat points has been used.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1107/S010876738900927X
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  • 3
    Electronic Resource
    Electronic Resource
    Lattice complexes with at most one comprehensive complex (1995)
    [S.l.] : International Union of Crystallography (IUCr)
    Acta crystallographica 51 (1995), S. 586-587 
    Details
    ISSN: 1600-5724
    Source: Crystallography Journals Online : IUCR Backfile Archive 1948-2001
    Topics: Chemistry and Pharmacology , Geosciences , Physics
    Notes: Most lattice complexes with less than three degrees of freedom are contained as limiting complexes within several comprehensive complexes corresponding to general Wyckoff positions. There exist, however, 21 exceptional cases: 3 lattice complexes without any and 18 lattice complexes with exactly one such comprehensive complex each. They are listed together with their comprehensive complexes. This information may be used to restrict geometrical investigations of all point configurations to general positions of space groups.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1107/S0108767394013681
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  • 4
    Electronic Resource
    Electronic Resource
    Minimal surfaces with self-intersections along straight lines. I. Derivation and properties (1999)
    [S.l.] : International Union of Crystallography (IUCr)
    Acta crystallographica 55 (1999), S. 58-64 
    Details
    ISSN: 1600-5724
    Source: Crystallography Journals Online : IUCR Backfile Archive 1948-2001
    Topics: Chemistry and Pharmacology , Geosciences , Physics
    Notes: A special kind of three-periodic minimal surface has been studied, namely surfaces that are generated from disc-like-spanned skew polygons and that intersect themselves exclusively along straight lines. A new procedure for their derivation is introduced in this paper. Several properties of each such surface may be deduced from its generating polygon: the full symmetry group of the surface, its orientability, the symmetry group of the oriented surface, the pattern of self-intersections, the branch points of the surface, the symmetry and periodicity of the spatial subunits demarcated by the surface, and the Euler characteristics both of the surface and of the spatial subunits. The corresponding procedures are described and illustrated by examples.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1107/S0108767398007521
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  • 5
    Electronic Resource
    Electronic Resource
    Cluster of framework considerations for the structures of Tl7Sb2, α-Mn, Cu5Zn8 and their variants Li22Si51, Cu41Sn11, Sm11Cd45, Mg6Pd and Na6Tl with octuple unit cells (1981)
    [S.l.] : International Union of Crystallography (IUCr)
    Acta crystallographica 37 (1981), S. 1-6 
    Details
    ISSN: 1600-5724
    Source: Crystallography Journals Online : IUCR Backfile Archive 1948-2001
    Topics: Chemistry and Pharmacology , Geosciences , Physics
    Notes: Eight intermetallic compounds described so far by clusters are compared. It is shown that a common framework exists for all these crystal structures. The voids within this common part are filled in different ways. Moreover, for each of these crystal structures all atoms together form a three-dimensional connected framework. Therefore, the framework description seems to be more adequate than the cluster description.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1107/S0567739481000016
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  • 6
    Electronic Resource
    Electronic Resource
    The implications of normalizers on group–subgroup relations between space groups (1984)
    [S.l.] : International Union of Crystallography (IUCr)
    Acta crystallographica 40 (1984), S. 593-600 
    Details
    ISSN: 1600-5724
    Source: Crystallography Journals Online : IUCR Backfile Archive 1948-2001
    Topics: Chemistry and Pharmacology , Geosciences , Physics
    Notes: A hierarchy of classifications for subgroups of space groups by means of Euclidean and affine normalizers is introduced. The different levels of this classification scheme are illustrated in detail with examples and its usefulness for various problems is demonstrated. The Euclidean (or affine) normalizers of a space group G and of one of its subgroups U may either coincide [N(G)=N(U)], or form a group-subgroup pair [N(G) ⊃ N(U) or N(G) ⊂ N(U)], or share only a common subgroup [N(G) ⫆N(U) and N(G) ¢ N(U)]. The different implications of these cases on the equivalence classes of subgroups (or supergroups) are discussed. A procedure is given to calculate the normalizers. The same concept may be applied to number of equivalent subgroups or supergroups, other crystallographic groups without problems.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1107/S0108767384001227
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  • 7
    Electronic Resource
    Electronic Resource
    On the equivalence of point configurations due to Euclidean normalizers (Cheshire groups) of space groups (1983)
    [S.l.] : International Union of Crystallography (IUCr)
    Acta crystallographica 39 (1983), S. 907-915 
    Details
    ISSN: 1600-5724
    Source: Crystallography Journals Online : IUCR Backfile Archive 1948-2001
    Topics: Chemistry and Pharmacology , Geosciences , Physics
    Notes: The Euclidean normalizers of space groups form the appropriate mathematical tool for several problems treated independently by crystallographers in the past, e.g. the comparison, the classification and the standardized description of crystal structures. Explicit tables are presented that enable the user to handle Euclidean normalizers in an easy way and, especially, to calculate all descriptions of a crystal structure compatible with a chosen space-group setting. The use of the tables is illustrated by different examples, and the role of Euclidean normalizers for crystal-structure determination is discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1107/S0108767383001828
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  • 8
    Electronic Resource
    Electronic Resource
    Euklidische Normalisatoren für trikline und monokline Raumgruppen bei spezieller Metrik des Translationengitters (1990)
    [S.l.] : International Union of Crystallography (IUCr)
    Acta crystallographica 46 (1990), S. 826-831 
    Details
    ISSN: 1600-5724
    Source: Crystallography Journals Online : IUCR Backfile Archive 1948-2001
    Topics: Chemistry and Pharmacology , Geosciences , Physics
    Notes: A listing of the Euclidean normalizers for triclinic and monoclinic space groups having translation lattices with specialized metric is given. These normalizers have not been included in previous tabulations. For convenience, in the case of monoclinic space groups, only the second setting (c-axis unique) is considered and the metric of the cells is restricted within certain limits which warrant that all specialized cases and all cell choices according to International Tables for Crystallography [(1987) Dordrecht: Kluwer] are included.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1107/S0108767390007085
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  • 9
    Electronic Resource
    Electronic Resource
    Triply periodic minimal balance surfaces: a correction (1993)
    [S.l.] : International Union of Crystallography (IUCr)
    Acta crystallographica 49 (1993), S. 209-210 
    Details
    ISSN: 1600-5724
    Source: Crystallography Journals Online : IUCR Backfile Archive 1948-2001
    Topics: Chemistry and Pharmacology , Geosciences , Physics
    Notes: In previous papers, 15 families of minimal balance surfaces that can be generated with the aid of disc-like surface patches were noted. Recently, it has become apparent that the inherent symmetry of two of these families, the C(S) surfaces and the Y surfaces, is higher than the symmetry used for their generation. As a consequence, C(S) surfaces are in fact P surfaces and Y surfaces are in fact D surfaces.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1107/S0108767392007591
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  • 10
    Electronic Resource
    Electronic Resource
    The garnet-like cyanide framework of ammonium ferrocyanide hydrate with a channel system for ionic conductivity (1982)
    Copenhagen : International Union of Crystallography (IUCr)
    Acta crystallographica 38 (1982), S. 376-379 
    Details
    ISSN: 1600-5740
    Source: Crystallography Journals Online : IUCR Backfile Archive 1948-2001
    Topics: Chemistry and Pharmacology , Geosciences , Physics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1107/S056774088200301X
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