Dynamic Light Scattering of Polystyrene Latex in the Ordered State

A Laue pattern is observed for the ordered array of polystyrene latex particle. The pattern is well corresponding to a fcc lattice. The time correlation of intensity of scattered light, g (1) (τ), is also measured and analyzed. The intensity fluctuation of Laue spot shows a long time-correlation which can be approximately expressed as g (1) (τ)∼(τ) -0.61 at longer correlation time. The fact that decay constants, \(\), of g (1) (τ) show maximum at the half of the scattering angle of the Laue condition indicates that the movement of particle is correlated with each other.