Single chain form factor

Throughout the simulations, data are collected at periodic intervals. These include the radii of gyration, the lamellar thickness, the kinetic and potential energies, the single chain form factor S(q), the orientational order parameter, and free energy. S(q) is calculated as... 

For an isotropic melt, the single chain form factor can be fitted by the Debye function over the q range 5 10 10 A". At large q it is close to ... 

The same nomenclature, P(Q), is used for the single-chain form factor both in the amorphous state (Eq. (7.6)) and in the crystalline state (Eq. (7.24)), though the chain is not assumed to be Gaussian in the latter. 

For this system, the Babinet principle is not valid as it contains polymers and solvent molecules. If one matches the scattering length of the solvents and the averaged one of the polymers ( bpoiy = Obo + (1- ) bn) according to bpoiy = bo ( zero contrast), the second term of eqn [39] does not contribute to the scattering and, consequently, the single-chain form factor can be determined according to... 

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