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The refractive index increment, dn/dc, is an important material specific parameter of a polymer solution and is required for evaluating light scattering data. If this parameter is unknown for a given 'polymer-solvent' system, it has to be measured, because the light scattering formula includes dn/dc to the power of two in the calculation of molar mass. 


PSS can determine the refractive index increment at 620, 535, or 470 nm with excellent precision.  

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