Rayleigh scattering from argon clusters in a planar expansion

Rayleigh scattering is presented as the evidence for the presence of large argon clusters formed in a planar expansion. Based on the observed scattering signal, the dependence of mean cluster size on stagnation pressure is $\left\langle N \right\rangle \propto P_0 ^{3.38}$. This is in contrast to the dependence of the mean cluster size on stagnation pressure for a symmetric expansion of $\left\langle N \right\rangle \propto P_0 ^{2.29}$. Using interferometry in conjunction with the Rayleigh scattering signal we are able to estimate the mean cluster size for clusters formed in the planar expansion.