Stark-induced anticrossings in hydrogen. I. Theoretical study

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Abstract
The detection of Stark-induced anticrossings (AC) between Zeeman sublevels provides a convenient tool for measuring Lamb shifts of hydrogenic atoms. The anticrossings studied here can be of two different kinds: (i) a direct-coupling AC which occurs between two levels of different parity directly mixed by a static electric field; (ii) an indirect-coupling AC between levels of the same parity mixed through a third intermediate level. In order to compute these effects in the case of hydrogen atoms, the transition probabilities have been recalculated taking into account all the crossed terms.