Talk:Static light scattering

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There seems to be an error in the Zimm plot section. It is impossible to have a PDI < 1. PDI = Mw/Mn, and the Mw is always greater than or equal to Mn. Was this meant to read PDI < 1.3 maybe?

You are right concerning the PDI of polymers which always have a value larger or equal to 1.0. The section on Zimm plot analysis refers to the polydispersity of sample, which has a the definition \mu_2/\bar{\Gamma}^2 and has another meaning as Mw/Mn. i.e. the PDI from DLS is a physical property of a sample in solution due to Brownian motion, while Mw/Mn is a physical property comparing average numbers and molecular masses of a particular (polymer) sample. Maartend8 (talk) 20:45, 26 January 2008 (UTC)