Since the terms εi(1) H and εi(2) H2in Equation 10 are usually small compared to εoi, they can be calculated by quantum-mechanical perturbation theory. The term εi(1) H is the first order perturbation of the
the recharging power would have to come from some other source. While some recharging power could come from the force of gravity (for example, the momentum from going down a hill could be converted into electricity), most of the recharging power would have to come from somewhere else—such ...