G.N. Gibson, R.R. Freeman, Holmdel, N.J., and T.J. Mcllrath
Multiphoton ionization (MPI) of atoms by intense laser fields has now received over a decade of research. Despite great progress in understanding this seemingly simple process, new observations continue to be made that challenge the accepted picture. The most recent set of experiments highlight the important role of excited states in the MPI process.
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