Cross-section per unit volume of homogeneous polymers in solution

4 Cross-section (per unit volume) of homogeneous polymers in solution 

We shall now consider polymers made of chemically identical monomers in solution in one solvent. In this case, expression (7.2.37) for the cross-section can be simplified because, then, there exists only one contrast length, independently of the fact that the system may be either monodisperse or polydisperse. 

the cross-section per unit volume can simply be expressed in terms of this structure function 

the decomposition into intramolecular and intermolecular contributions gives 

In the monodisperse case, the right-hand side equals CNH(q). 

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