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Forward scattering of light, X-rays and neutrons

Published online by Cambridge University Press:  17 March 2009

Henryk Eisenberg
Henryk Eisenberg
Affiliation:
Laboratory of Molecular Biology, National Institute of Arthritis, Metabolism and Digestive Diseases, National Institutes of Health, Bethesda, Maryland 20205 and Polymer Department, The Weizmann Institute of Science, Rehovot, Israel76100*
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Extract

The central points of this paper can now be summarized. We consider here, for simplicity only, vanishing particle concentration. In equilibrium sedimentation equation (6) applies. The density increment is a measurable quantity. It can either be introduced into equation (6) to calculate M2, or it can be analysed by equations (7) and (8) to provide additional information on specific volumes and solute interactions.

Light scattering is determined by the analogous equation (20). The refractive index increment is also experimentally accessible and its structure (not considered here) is similar to that of the density increment. Small angle X-ray scattering is determined by equation (31) and the electron density increment which appears in this equation cannot be directly determined by experiment. Yet it can be obtained in straightforward fashion from the mass density increment, by equation (34). Similarly, in the case of neutron scattering (equation (38)), the scattering length density increment is obtained from the mass density increment by equation (40), or it may now be directly evaluated by neutron interferometry.

Type
Research Article
Information
Quarterly Reviews of Biophysics , Volume 14 , Issue 2 , May 1981 , pp. 141 - 172
Copyright
Copyright © Cambridge University Press 1981

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