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Abstract: Accurate characterization using static light scattering SLS and dynamiclight scattering DLS methods mandates the measurement and analysis ofsingly-scattered light. In turbid samples, the suppression of multiplescattering is therefore required to obtain meaningful results. One powerfultechnique for achieving this, known as 3D cross-correlation, uses twosimultaneous light scattering experiments performed at the same scatteringvector on the same sample volume in order to extract only the single scatteringinformation common to both. Here we present a significant improvement to thismethod in which the two scattering experiments are temporally separated bymodulating the incident laser beams and gating the detector outputs atfrequencies exceeding the timescale of the system dynamics. This robustmodulation scheme eliminates cross-talk between the two beam- detector pairsand leads to a four-fold improvement in the cross-correlation intercept. Wemeasure the dynamic and angular-dependent scattering intensity of turbidcolloidal suspensions and exploit the improved signal quality of the modulated3D cross-correlation DLS and SLS techniques.



Author: Ian Block, Frank Scheffold

Source: https://arxiv.org/







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