Neutron scattering measurement intermediate length

Inelastic neutron scattering is a technique that has been widely used both in the liquid and in the solid states to measure the stmcture and dynamics at small (that is, molecular) length scales. In an incoherent inelastic neutron-scattering experiment, the measured quantity is the self-dynamic structure factor Ss(Q, (o), which gives information, as in the liquid state, of the self-diSiision coefficient of the water molecules. Ss(Q, (o) is the Fourier transform of the intermediate self-scattering function Fg(Q, t), which is defined by... 

Fig. 5.14. Profile for intermediate wave vector neutron scattering by a giant micelle solution. Axes chosen (ql q) against q) bring out the change in variation at wave vector qf. This value seperates the rigid regime horizontal part) from the flexible regime steeply decreasing curve at small q). The value of Qi measured leads to an estimate of persistence length /p. In this example, 1 150 A...

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