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The colloidal dance as seen by coherent X-rays. How to lift the fog of multiple scattering

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Abstract

Multiple scattering wipes out the wavevector dependence of the dynamical information that is contained in the correlation functions measured in photon correlation spectroscopy. The use of coherent X-rays as a source in photon correlation spectroscopy nullifies the effects of multiple scattering in dense colloidal systems because of the low contrast. A second technique to suppress multiple scattering is cross-correlated light scattering. The combination of the two techniques enables us to measure the dynamic and static properties of dense colloids and other strongly scattering systems as a function of wavevector over the relevant wavevector range. Measurements show new results on the hydrodynamic interaction in dense colloids.

© 2000 Optical Society of America

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