Stark effect for the Rydberg states of the hydrogen atom
Vainberg V. M. , Mur V. D. , Popov V. S. , Sergeev A. V.
The Stark shifts and the widths of highly excited {n = 15-30) states of a hydrogen atom in a strong electric field, which is higher than the classical ionization threshold of an atom, are calculated. The results of the calculations are in agreement with the experiment.