Inelastic electron relaxation rates caused by Spin M/2 Kondo Impurities

We study a spin $S=M/2$ Kondo system coupled to electrons in an arbitrary nonequilibrium situation above Kondo temperature. Coupling to hot electrons leads to a shorter lifetime of pseudo particles and hence a larger Korringa width. This in turn is responsible for the enhanced inelastic relaxation rates of the electronic system. The rates are related to spin\char21{}spin correlation functions which are determined using a projection operator formalism. The results generalize recent findings for $S=\frac{1}{2}$ Kondo impurities which have been used to describe energy relaxation experiments in disordered mesoscopic wires.