Zimm plot

A diagrammatic representation of data on scattering from large particles, corresponding to the equation:

$K c Δ R θ = 1 M ̄ w P θ + 2 A 2 c + ...$

and used for the simultaneous evaluation of the mass average molar mass, $M ̄ w$ , the second virial coefficient of the chemical potential, $A 2$ , and (usually) the z-average radius of gyration, $s 2 z 1 2$ ; $c$ is the mass concentration of the solute, $Δ R θ$ the excess Rayleigh ratio, and $P θ$ the particle scattering function that comprises (usually) the z-average radius of gyration. $K$ depends on the solute, the temperature and the type of radiation employed. Several modifications of the Zimm plot are in frequent use; the most common one uses the excess scattering instead of the excess Rayleigh ratio.

Source:

Purple Book, p. 66