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  • 1
    Electronic Resource
    Electronic Resource
    Study of ethanol-lysozyme interactions using neutron diffraction (1985)
    s.l. : American Chemical Society
    Biochemistry 24 (1985), S. 5862-5869 
    Details
    ISSN: 1520-4995
    Source: ACS Legacy Archives
    Topics: Biology , Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/bi00342a026
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  • 2
    Electronic Resource
    Electronic Resource
    A prediction of Bijvoet intensity differences in the noncentrosymmetric structures of selenium and tellurium (1978)
    [S.l.] : International Union of Crystallography (IUCr)
    Acta crystallographica 34 (1978), S. 936-939 
    Details
    ISSN: 1600-5724
    Source: Crystallography Journals Online : IUCR Backfile Archive 1948-2001
    Topics: Chemistry and Pharmacology , Geosciences , Physics
    Notes: The presence of an antisymmetric component of the non-spherical atomic charge distribution results in a more general breakdown of Friedel's law in polyatomic noncentrosymmetric structures. That this is also true in the case of noncentrosymmetric structures of elements is demonstrated directly for the case of the trigonal structures of Se and Te.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1107/S0567739478001916
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  • 3
    Electronic Resource
    Electronic Resource
    Some consequences of the presence of antisymmetric atomic features in noncentrosymmetric structures (1979)
    [S.l.] : International Union of Crystallography (IUCr)
    Acta crystallographica 35 (1979), S. 260-265 
    Details
    ISSN: 1600-5724
    Source: Crystallography Journals Online : IUCR Backfile Archive 1948-2001
    Topics: Chemistry and Pharmacology , Geosciences , Physics
    Notes: Noncentrosymmetric structures are considered in terms of a generalized substructure formulation. Inclusion of dispersion, bonding and anharmonicity leads to generalized expressions for Bijvoet ratios. Methods of numerically estimating the effects due to bonding and anharmonicity upon the Bijvoet ratios are suggested. Allowance for bonding and anharmonicity is shown to have wide implications for the breakdown of Friedel's law. Subsets of reflections that obey Friedel's law in the conventional approximation are now shown to violate it. These violations are of considerable importance for measuring antisymmetric contributions due to bonding and anharmonic thermal vibrations. The possibility that bonding effects will result in the appearance of Bijvoet differences in noncentrosymmetric structures of elements is explored.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1107/S0567739479000565
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  • 4
    Electronic Resource
    Electronic Resource
    Comments on High-precision orientation of crystals using the Laue method with characteristic X-rays by O. Christiansen, L. Gerward and I. Alstrup (1976)
    [S.l.] : International Union of Crystallography (IUCr)
    Acta crystallographica 32 (1976), S. 168-168 
    Details
    ISSN: 1600-5724
    Source: Crystallography Journals Online : IUCR Backfile Archive 1948-2001
    Topics: Chemistry and Pharmacology , Geosciences , Physics
    Notes: It is pointed out that under certain conditions one may need to take account of absorption and other effects in order to achieve the high precision claimed by Christiansen, Gerward and Alstrup [Acta Cryst. (1975). A31, 142-145].
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1107/S056773947600034X
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  • 5
    Electronic Resource
    Electronic Resource
    Anharmonic temperature factors of zinc selenide determined by X-ray diffraction from an extended-face crystal (1980)
    [S.l.] : International Union of Crystallography (IUCr)
    Acta crystallographica 36 (1980), S. 482-490 
    Details
    ISSN: 1600-5724
    Source: Crystallography Journals Online : IUCR Backfile Archive 1948-2001
    Topics: Chemistry and Pharmacology , Geosciences , Physics
    Notes: Generalized structure factor expressions are derived for the zinc blende structure. Inclusion of dispersion corrections is shown to give rise to the breakdown of Friedel's law for all-even-index reflections, an effect due to the presence of bonding or anharmonicity. X-ray intensity measurements from an extended-face crystal are interpreted within the generalized structure factor formalism to yield the B factors BZn = 1.020 ± 0.005 Å2 and BSe = 0.739 ± 0.008 Å2 and an effective cubic anharmonic thermal parameter {\cal B}ZnSe = βZn/α3Zn - βSe/α3Se = --(6.8 ± 1.1) × 1036 J-2 Å3 at 296 K. These are compared with values for other zinc blende compounds and with theoretically calculated B factors.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1107/S0567739480001003
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  • 6
    Electronic Resource
    Electronic Resource
    The geometry of X-ray diffraction from extended-face single crystals (1981)
    [S.l.] : International Union of Crystallography (IUCr)
    Acta crystallographica 37 (1981), S. 105-119 
    Details
    ISSN: 1600-5724
    Source: Crystallography Journals Online : IUCR Backfile Archive 1948-2001
    Topics: Chemistry and Pharmacology , Geosciences , Physics
    Notes: An analytical method for the description and analysis in real space of X-ray Bragg reflections from extended-face crystals is presented. The method is applied to discuss the stationary-crystal diffracted-beam images in both the symmetric and asymmetric reflection positions, to analyse the ω and ω:2θ scan modes and to derive the optimum coupling between the detector and crystal motions for an equatorial-plane diffractometer. In practice, the optimum scan mode would require the use of a receiving aperture inclined with respect to the diffraction plane, the angle of inclination being dependent on the diffractometer setting angles. It is concluded that the ω:2θ scan mode is most suitable for routine data collection. Experimental images of the diffracted beam illustrate clearly the validity and usefulness of the mathematical description.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1107/S0567739481000181
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  • 7
    Electronic Resource
    Electronic Resource
    A general Lorentz correction for single-crystal diffractometers (1988)
    [S.l.] : International Union of Crystallography (IUCr)
    Acta crystallographica 44 (1988), S. 257-262 
    Details
    ISSN: 1600-5724
    Source: Crystallography Journals Online : IUCR Backfile Archive 1948-2001
    Topics: Chemistry and Pharmacology , Geosciences , Physics
    Notes: A single-crystal Lorentz correction is derived for the case of a general scan through an out-of-plane reflection on a four-circle diffractometer with relaxed sample-to-detector collimation. When the Lorentz correction is expressed in terms of the incremental steps in the Eulerian setting angles, structure amplitudes observed by different scan trajectories, for example, some angular in real space and others linear in reciprocal space, are put on a common scale, and errors due to known missetting of the angles or rounding off of the angles are avoided.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1107/S0108767387011656
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  • 8
    Electronic Resource
    Electronic Resource
    Magnetic ordering in triangular antiferromagnets: A neutron scattering study (abstract) : 35th annual conference on magnetism and magnetic materials (1991)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 69 (1991), S. 5968-5968 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Recent much theoretical interest has been shown in the magnetic ordering process of triangular antiferromagnets. Such a magnetic lattice type should exhibit strong frustration effects. The hexagonal ABX3 ternary halides and the AX2 metal halides are good candidates for studying the frustration effects on the triangular lattice. We discuss neutron scattering studies of the magnetic ordering process in the Ising-like antiferromagnets CsCoCl3, CsMnI3, and the XY-like antiferromagnets CsMnBr3, CsVCl3. The effects of magnetic as well as diamagnetic doping were studied for the systems CsMn1−xMgxBr3 and CsMn1−xFexBr3. Asymmetric line profiles were observed which corresponds to frustration behavior in the magnetic ordering of this type of compound. A release of frustration is observed for the modified triangular antiferromagnet.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.347839
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  • 9
    Electronic Resource
    Electronic Resource
    Magnetic phases of Gd-Sc alloys in the multicritical regime (1988)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 64 (1988), S. 5889-5891 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: We have carried out ultrasonic and neutron studies of a range of single-crystal Gd1−x Scx random alloys (x=0.25, 0.28, 0.295, 0.31, 0.32, 0.36) in the vicinity of the multicritical point at x=0.29. The sample richest in Gd shows magnetic behavior similar to the pure element while those richer in Sc display helimagnetism with lock-in effects at low temperature. The sample closest to the multicritical point (x=0.28) shows unusual magnetic behavior at low temperatures.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.342191
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  • 10
    Electronic Resource
    Electronic Resource
    A diffractometer technique for precise orientation of single crystals (1978)
    Copenhagen : International Union of Crystallography (IUCr)
    Applied crystallography online 11 (1978), S. 125-127 
    Details
    ISSN: 1600-5767
    Source: Crystallography Journals Online : IUCR Backfile Archive 1948-2001
    Topics: Geosciences , Physics
    Notes: A diffractometer technique for determining the orientation of single crystals is described. The technique is well suited for small spherical or nonabsorbing crystals, as well as for large, extended-face crystals and boules. Since the orientation is determined in a plane perpendicular to the plane of incidence of the diffractometer, the technique does not require an accurate knowledge of the lattice parameter for cubic crystals. The c/a ratio or all cell parameters must, however, be known accurately for crystals of lesser symmetry. It is shown that the orientation can be determined to within 0.005°. Factors affecting the precision of the technique are discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1107/S002188987801287X
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