PQI2016 Ken Jordan: Using Drude Oscillators to Illustrate Dispersion Dipoles

Ken Jordan (Pitt) shows how electronic correlation in a system can be taken into account via a Drude oscillator.
First he demonstrates Feyman's "conjecture", which states that two atoms at long distance acquire permanent dipoles due to dispersion interactions. The dipole and atomic force both vary as R-7.
He shows that the permanent dipole on an atom is induced by the coupling of the instantaneous dipole on the other atom and its hyperpolarizability, and that, as predicted by Feynman, the two negative ends of the dipoles point toward each other.