Nonperturbative resonant strong field ionization of atomic hydrogen

@article{Girju2007NonperturbativeRS,
  title={Nonperturbative resonant strong field ionization of atomic hydrogen},
  author={M. G. Girju and Kiril Hristov and O. Kidun and Dieter Bauer},
  journal={Journal of Physics B: Atomic, Molecular and Optical Physics},
  year={2007},
  volume={40},
  pages={4165 - 4178}
}
We investigate resonant strong field ionization of atomic hydrogen with respect to the 1s–2p transition. By ‘strong’ we understand that Rabi periods are executed on a femtosecond time scale. Ionization and AC Stark shifts modify the bound state dynamics severely, leading to nonperturbative signatures in the photoelectron spectra. We introduce an analytical model, capable of predicting qualitative features in the photoelectron spectra such as the positions of the Autler–Townes peaks for modest… 
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TLDR
The precise form of this structure was found to depend on both the laser detuning and the irradiance, but was unaffected by the turn-on transient, and was deduced to be an effect of the Rabi coupling between the 1s and 2p states.
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