The diffusion equation of the sphere

The correlation function of the Brownian rotational diffusion of a sphere is

$${\frac{{1}}{{5}}} {\frac{{\tau}}{{\tau_m}}}$$ C_O(τ) (15.160)

$${\frac{{1}}{{5}}} \sum^{0}_{{i=0}} {\frac{{\tau}}{{\tau_i}}}$$ (15.161)

where c_i is the weight of the single exponential term and τ_i is the correlation time of the single exponential term.