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Even moderate laser fields with intensities of about 1013 W/cm2, standard in many ultrafast experiments, suppress the potential barrier for ionization for all excited states in most atoms and molecules. By means of angle resolved photoelectron spectra, we have shown [1] that in this regime the formation of stable “laser-dressed” atoms, the so-called Kramers-Henneberger (KH) atoms [2], plays a crucial...
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