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A New Absolute-Scale Small-Angle X-Ray Scattering Instrument

Published online by Cambridge University Press:  06 March 2019

H. Pessen ,
T. F. Kumosinski ,
S. N. Timasheff ,
R. R. Calhoun Jr.  and
J. A. Connelly
H. Pessen
Affiliation:
Eastern Utilization Research and Development Division U. S. Department of Agriculture Philadelphia, Pennsylvania 19118
T. F. Kumosinski
Affiliation:
Eastern Utilization Research and Development Division U. S. Department of Agriculture Philadelphia, Pennsylvania 19118
S. N. Timasheff
Affiliation:
Eastern Utilization Research and Development Division U. S. Department of Agriculture Philadelphia, Pennsylvania 19118
R. R. Calhoun Jr.
Affiliation:
Eastern Utilization Research and Development Division U. S. Department of Agriculture Philadelphia, Pennsylvania 19118
J. A. Connelly
Affiliation:
Eastern Utilization Research and Development Division U. S. Department of Agriculture Philadelphia, Pennsylvania 19118
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Abstract

A small-angle X-ray scattering apparatus is described which is based on a Guinier focusing arrangement, utilizing a fine-focus tube, a Johann-type curved-crystal monochromator, two goniometermounted beam-defining slits and proportional detection. It differs from previously described instruments in important respects. Using a horizontal goniometer, it affords ease of access and mechanical stability to mounted parts, such as slits and beam stop. The major instrument assemblies--the horizontal tube housing producing the vertical line-shaped beam, and the goniometer table--are mounted on a granite surface plate for stability. For ease, precision and reproducibility in alignment, fine adjustments, with micrometer heads or dial indicators where advisable, are provided for all pertinent rotational and translational motions of the various subassemblies. In particular, provision is made for fine adjustment of the goniometer as a whole with respect to the X-ray source, to facilitate threading the monochromator-focused beam through the slit system and the center of rotation of the detector arm.

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Type
Research Article
Information
Advances in X-Ray Analysis , Volume 13: Eighteenth Annual Conference on Applications of X-ray Analysis, August 6-8, 1969 , 1969 , pp. 618 - 631
Copyright
Copyright © International Centre for Diffraction Data 1969

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