Abstract
The advent of table-top laser systems which are capable of producing electric field strengths of the order of the atomic unit has allowed the study of laser-atom interactions in a regime where the radiation field can no longer be considered as simply a perturbation to the atom. In this nonperturbative regime interesting new phenomena, which are collectively referred to as multiphoton processes, have been observed. Three notable examples include: above threshold ionization (ATI), in which electrons absorb more photons than are required to ionize the atom [1]; resonantly enhanced multiphoton ionization (REMPI), the shifting into resonance of Rydberg states due to the strong ac-Stark shifts induced by the intense laser field [2]; and harmonic generation, the emission by the atom of high-order, odd harmonics of the laser field frequency [3].
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Kylstra, N.J. (1997). Resonance Effects in Multiphoton Ionization. In: Burke, P.G., Joachain, C.J. (eds) Photon and Electron Collisions with Atoms and Molecules. Physics of Atoms and Molecules. Springer, Boston, MA. https://doi.org/10.1007/978-1-4615-5917-7_14
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