Comparison of small angle X-ray scattering data obtained under different collimation conditions

Weil, C.G; Schmidt, Paul W.; Jánosi, A.; Sekora, A.; Kratky, O.

doi:10.1107/s0021889870005691

Cited by 4 publications

(2 citation statements)

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“…Two studies which have been carried out indicate that collimation corrections as they are currently being applied are reliable. One study makes a comparison of small-angle Xray scattering data obtained under different collimation conditions (336) and the other study compares two different methods for calculating collimation corrections (289). A number of papers have appeared on the interpretation of small-angle X-ray scattering curves, that is concerning the possibility of determining the dimensions and detailed shapes of particles, the theoretical diffraction curves for various models such as helical filaments, etc.…”

Section: Small-angle Scatteringmentioning

confidence: 99%

X-ray diffraction

Pfluger¹

1972

Anal. Chem.

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Section: Small-angle Scatteringmentioning

confidence: 99%

X-ray diffraction

Pfluger¹

1972

Anal. Chem.

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“…Hendricks & Schmidt (1967) have developed a method by which weighting functions and their moments can be calculated for collimating systems employing slits to define the X-ray beam. More recently Weil, Schmidt, Janosi, Sekora & Kratky (1970) have compared small angle X-ray data obtained under different collimation conditions in two laboratories. …”

Section: A Comparison Of the Corrected Observed Scatteringmentioning

confidence: 99%

Absolute power measurements in small angle X-ray scattering with gas scattering calibration

Shaffer¹,

Beeman²

1970

J Appl Cryst

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The calibration of a high intensity X-ray beam from a rotating anode tube has been accomplished with the small angle scattering from three heavy gases used as primary standards because their scattering cross sections at zero angle could be calculated. The scattering of the three gases permitted calibration of the incident beam and geometry to +2%. A scattering 10% in excess of that predicted from the thermodynamic relationships was observed for water, ethyl alcohol, xylene, and benzene. This excess was ascribed to double scattering. Possible application of these methods to determine the molecular weight of macromolecules was investigated. Scattering observed from solutions of metmyoglobin was within 3% of the predicted scattering. For ribonuclease a 35% excess over predicted scattering was observed and was ascribed to aggregation, of the molecules, shown by ultra centrifuge methods to occur in these solutions.

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Small-Angle X-Ray Scattering Study of Phase Separation in Glasses

Patel

Schmidt

Ohlberg

1972

Journal of Applied Physics

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Two heat-treated glasses, a calcium glass (76.1% SiO2, 11.0% CaO, and 12.9% Na2O by weight) and a strontium glass (69.8% SiO2, 18.4% SrO, and 11.8% Na2O by weight), have been investigated by small-angle x-ray scattering. The samples were studied with a Kratky camera and also with a four-slit collimation system of the type developed by Beeman et al. The use of two independent collimation systems provided a check for systematic errors. In addition, the results verify the reliability of the collimation correction methods routinely employed in correction of collimation effects in small-angle x-ray scattering data. The measured radii of gyration correspond to spherical droplets with diameters of about 500 Å in good agreement with the diameters obtained from electron micrographs. By comparison of the scattering from the glass samples with the scattering from calibrated silica suspensions, the difference in the electron densities of the droplet phase and the matrix was computed for each glass. The results indicate that the droplet phase is a high-density form of silica with density 2.32 g/cm3, as compared with the normal value of 2.20 g/cm3 for vitreous silica. A defective cristobalite structure with density 2.32 g/cm3 is proposed for the droplet phase.

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Comparison of small angle X-ray scattering data obtained under different collimation conditions

Cited by 4 publications

References 1 publication

X-ray diffraction

X-ray diffraction

Absolute power measurements in small angle X-ray scattering with gas scattering calibration

Small-Angle X-Ray Scattering Study of Phase Separation in Glasses

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