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  • 1
    Electronic Resource
    Electronic Resource
    A simple variable-wavelength X-ray monochromator (1988)
    Copenhagen : International Union of Crystallography (IUCr)
    Applied crystallography online 21 (1988), S. 992-993 
    Details
    ISSN: 1600-5767
    Source: Crystallography Journals Online : IUCR Backfile Archive 1948-2001
    Topics: Geosciences , Physics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1107/S0021889888007563
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  • 2
    Electronic Resource
    Electronic Resource
    The calculation and interpretation of multiphonon X-ray scattering - example of cubic zincblende structure compounds (1985)
    [S.l.] : International Union of Crystallography (IUCr)
    Acta crystallographica 41 (1985), S. 517-528 
    Details
    ISSN: 1600-5724
    Source: Crystallography Journals Online : IUCR Backfile Archive 1948-2001
    Topics: Chemistry and Pharmacology , Geosciences , Physics
    Notes: The problems of making calculations using the total phonon scattering cross section in the harmonic approximation are examined and it is found that the method of Reid & Smith [J. Phys. C (1970), 3 1513- 1526] can be extended to cope with any material with a modest number of atoms per unit cell. Complex eigenvectors and complex scattering factors may be handled without approximations. The method is used to evaluate the multiphonon scattering (and one-phonon scattering) for a number of cubic zincblende structure compounds including GaAs, CdTe, CuI and SiC, taking eigendata from good lattice dynamical models. The results illustrate a discussion of the typical behaviour of multiphonon scattering as a function of scattering vector and temperature. The effect of anomalous dispersion on the total phonon scattering cross section is also shown and a discussion given of the origin of multiphonon processes, with particular reference to the contribution of these processes to the diffuse scattering observed near Bragg reflections. It is also concluded that dynamic deformation will not significantly affect multiphonon intensities.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1107/S0108767385001155
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  • 3
    Electronic Resource
    Electronic Resource
    The effect of ionic deformation on one-phonon X-ray scattering (1987)
    [S.l.] : International Union of Crystallography (IUCr)
    Acta crystallographica 43 (1987), S. 98-102 
    Details
    ISSN: 1600-5724
    Source: Crystallography Journals Online : IUCR Backfile Archive 1948-2001
    Topics: Chemistry and Pharmacology , Geosciences , Physics
    Notes: Explicitly representing the deformation of ions by the lattice dynamical shell model, the one-phonon scattering is written in a form that is amenable to direct evaluation. An analytic expression for the shell scattering factor is introduced, and the percentage alteration in the scattering brought about by the ionic deformation during vibration is calculated. Contour plots of the effect are presented for GaAs, ZnS and Si as representative of the zinc-blende-structure compounds and group IV elements. The alteration produced by shell models is found to be negative, because for these materials the shell moves less than the core. Its maximum value varies from about -2.5 to -15% depending on the material and lattice dynamical model used. Its structure in reciprocal space should be measurable and could lead to a better understanding of deformation processes.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1107/S010876738709980X
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