WKB solution of the Stark effect in hydrogen

Abstract
We present an analytical solution for the nonrelativistic Stark effect in hydrogen separated in parabolic coordinates. The solution is given in terms of elliptic integrals and is obtained in a first-order WKB approximation. In addition, by a suitable approximation, we extend the WKB results to autoionizing states, above the threshold barrier. A short comparison of the present results with exact numerical calculations is also presented.

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