Absolutely continuous spectrum of perturbed Stark operators

We prove new results on the stability of the absolutely continuous spectrum for perturbed Stark operators with decaying or satisfying certain smoothne ss assumption perturbation. We show that the absolutely continuous spectrum of the Stark operator is stable if the perturbing potential decays at the rate (1 + x)(-1/3-epsilon) or if it is continuously differentiable with der ivative from the Holder space C-alpha(R), with any alpha > 0.