Statistics of Particle Trajectories at Short Time Intervals Reveal fN-Scale Colloidal Forces
Statistics of Particle Trajectories at Short Time Intervals Reveal fN-Scale Colloidal Forces
We describe and implement a technique for extracting forces from the relaxation of an overdamped thermal system with normal modes. At sufficiently short time intervals, the evolution of a normal mode is well described by a one-dimensional Smoluchowski equation with constant drift velocity $v$, and diffusion coefficent $D$. By virtue …