We report on investigations of time dependent autoionization of doubly excited magnesium atoms in a strong electric field. A narrow band laser excites one electron towards a 3s16k Stark state and, subsequently, the second electron is excited with a short laser pulse. The autoionizing electron yield shows a stepwise decay which is detected by a streak camera with picosecond resolution. Quantum calculations are in good agreement with the experimental results.

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Journal Phys. Rev. Lett.
Warntjes, J. B. M, Wesdorp, C, Robicheaux, F, & Noordam, L. D. (1999). Stepwise electron emission from autoionizing magnesium Stark states. Phys.Rev.Lett., 83, 512–515.