Experimental investigation of the correlation function near the critical point
Anisimov M.A., Evtyushenkov A.M., Kiyachenko Yu.F., Yudin I.K.
An analysis of the angular and temperature dependences of the critical opalescence has revealed a deviation of the correlation function from the Ornstein-Zernike approximation. The obtained correlation function is of the form G{k, rc)~(rc~2 + k2)~(l ~<r'/2»j where к is the wave number, rc is the correlation radius and η=0.055±0.010.