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A correction procedure for the errors in single-crystal intensities due to the inhomogeneity of the primary X-ray beam (1980)

Harkema, S. ; Dam, J. ; van Hummel, G. J. ; [et al.]

[S.l.] : International Union of Crystallography (IUCr)

Acta crystallographica 36 (1980), S. 433-435

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ISSN: 1600-5724

Source: Crystallography Journals Online : IUCR Backfile Archive 1948-2001

Topics: Chemistry and Pharmacology , Geosciences , Physics

Notes: Graphite monochromators are known to give rise to non-homogeneous primary X-ray beams. When intensities of single crystals are measured the effective cross section of a non-spherical crystal in the X-ray beam depends on its orientation in the beam. Therefore, systematic errors in the measured integrated intensities are introduced by the inhomogeneity of the incoming beam. A correction for these errors can be made, knowing the intensity profile of the primary beam and the dimensions and orientation of the crystal in the beam. The correction can conveniently be applied with the absorption correction. Examples of the corrections are given for crystals with rational boundary planes. It is shown that the intensity of an X-ray reflection as a function of the rotation about the scattering vector (ψ rotation) can be calculated with fair accuracy. In some cases (large elongated crystals in an inhomogeneous beam) correction for absorption only may give results which are worse than those with no correction at all.

Type of Medium: Electronic Resource

URL: http://dx.doi.org/10.1107/S0567739480000939

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Frequency dependent linear viscoelastic properties of ordered polystyrene latices (1984)

Blom, C. ; Mellema, J. ; Lopulissa, J. S. ; [et al.]

Springer

Colloid & polymer science 262 (1984), S. 397-402

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ISSN: 1435-1536

Keywords: ordered polystreen latex ; viscoelastic properties

Source: Springer Online Journal Archives 1860-2000

Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics

Notes: Abstract An experimental investigation of linear rheological properties of monodisperse ordered latex dispersions has been carried out. Measurements of the dynamic shear modulus and the dynamic viscosity in the frequency range between 0.04 Hz and 2500 Hz are reported. The volume fraction and the electrolyte concentration were variables in the experiment. The results show that a description of the rheological behaviour with a simple linear phenomenological equation is not possible. The measured dynamic moduli can only be described with a great number of relaxation times.