Isotropic material fitted by Ornstein-Zernike form

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SUMMARY

The discussion centers on the application of the Ornstein-Zernike equation to isotropic materials. The user is attempting to derive the pair correlation function but encounters difficulties. They mention a specific integral evaluation involving the residue theorem, which yields the desired results. The integral in question is $$\frac{N_c}{4\pi^3r}\int_{-\infty}^{\infty}dk\frac{e^{-ikr}}{1+k^2l_c^2}$$, indicating a complex analysis approach to solving the problem.

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  • Understanding of the Ornstein-Zernike equation
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Researchers in statistical mechanics, physicists working with isotropic materials, and students studying complex analysis in the context of physical applications.

alan
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I have known what Ornstein-Zernike equation is. I try to plug in the form as follow to the isotropic materials:
upload_2017-3-22_0-24-31.png

Still, I cannot show the pair correlation function as follow.
upload_2017-3-22_0-25-13.png


Can anyone know what I have missed?
 
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I don't know if this will help but I get the result you are looking for by evaluating the integral,$$\frac{N_c}{4\pi^3r}\int_{-\infty}^{\infty}dk\frac{e^{-ikr}}{1+k^2l_c^2}$$
by closing the infinite semi-circle in the lower half of the complex plane and using the residue theorem.
 
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