Time-Dependent Theory of Stark Quenching of2SStates in Hydrogen and Helium

Abstract
A nonperturbative time-dependent theory which gives Stark-quenching lifetimes in agreement with experiment for both one- and two-electron 2S states is presented. This theory differs from the conventional Bethe-Lamb theory of Stark quenching, but reduces to this older theory, for one electron atoms only, when a well-known sum rule is applied.