DLS 2nd cumulant analysis for polydisperse spheres

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DLS 2nd cumulant analysis for polydisperse spheres
Cumulant method, series expansion, only valid
for small size polydispersities lt 50
first Cumulant
yields inverse average hydrodynamic radius
second Cumulant
yields polydispersity
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Apparent and z-average diffusion coefficient
polydisperse samples
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1st Cumulant slope of Fs(q,t) for t ? 0
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