Space intensity correlations in the near field of the scattered light: A direct measurement of the density correlation function g(r)

We show that the two point intensity correlation in the near field of the s cattered light is directly related to the two point density correlation g(r ). Preliminary measurements on two sets of calibrated random pinholes of 14 0 and 300 mu m diameters, and on aqueous solutions of latex spheres of 5, 1 0, and 40 mu m are reported. A discussion on the desirability of the techni que as a simple and powerful alternative to low angle scattering will be pr esented.