Infinite slit approximation

The Porod law, given in Equation (5.71), shows the asymptotic behavior of I(q) at large q. A similar expression can be derived in terms of /( ) Thus, substituting (5.71) into (5.170) gives 

Guinier, A., and Foumet, G., Small Angle Scattering of X-Rays, Wiley, New York, 1955. 

Brumberger, H., Small-Angle X-Ray Scattering, Gordon and Breach, New York, 1967. 

Feigin, L. A., and Svergun, D. I., Structure Analysis by Small-Angle X-Ray and Neutron Scattering, Plenum Press, New York, 1987. 

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V Vu w(a,p,y) w(N, r) W t) wq volume of a polymer segment. 6.1.1.3 scattering volume. 1.2.2 unit cell volume. 3.3.1 crystallite orientation distribution function. 3.6.3 end-to-end distribution of a Gaussian chain. 5.2.1 [5.12] slit-length weighting function. 5.6.1 constant value of W(t) with infinite slit approximation. 5.6.3... 

If, in the detector plane, the effective slit is wider than the region of the pattern in which significant intensity is observed, the approximation of an infinite slit is valid. Let the slit be infinitively long in ft -direction but very narrow in 53-direction then in the tangent plane approximation the recorded scattering curve... 

To develop such better approximations we must extend the OZ equation so that it can be applied to fluids in a slit and to colloids. We can do this by regarding the supporting fluid as a component in a mixture of large and small particles. The large particles are the colloidal particles (or, if they are infinitely large, the walls of the slit). Following Henderson et al. [32] (HAB), we start with the OZ equations for a mixture... 

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