Effect of particle form factor on the correlation function and correlation length. (a) c(r) at and for several particle form factors. Solid lines: form factor of ellipsoid of revolution (R = 5 nm) with ∊ decreasing from top to bottom ( corresponds to the sphere form factor). Dashed lines: cylinder form factor with R = 5 nm and [; ; S(q) = 1]. Dotted horizontal line: c(r) = exp(-1). (b) Corresponding lC(Hi) (log–linear scale). Dotted horizontal line: lC = R = 5 nm.