CRITICAL ELECTRIC-FIELDS AND STARK RESONANCES IN THE HYDROGEN-ATOM

The exact values of critical electric fields E(c) for different states of a hydrogen atom, including its ground state, as well as the widths Gamma(n) of the Stark resonances at E = E(c), are calculated (at E=E( c)(n(1), n(2), m) the potential barrier for an electron in the (n(1), n(2), m) state disappears). Using the modified quantization condition with barrier penetrability included, we explain the dependence of Gamm a(n) on the principal quantum number n.