Abstract
From an analysis of multiauantum processes in atoms, which includes information derived from ion charge state distributions, photoelectron spectra, and photon spectra, and involving the atomic number (Z), intensity, frequency, and polarization dependencies, an approximate description of the electronic motions involved in these processes has emerged. The data strongly indicate that an organized motion of an entire shell, or a major fraction thereof, is directly involved in the nonlinear coupling. With this picture, the outer atomic subshells are envisaged as being driven in coherent oscillation by the intense ultraviolet wave. An immediate consequence of this motion is an increase in multiphoton coupling resulting directly from the larger magnitude of the effective charge involved in the interaction. In this way, a multielectron atom undergoing a nonlinear interaction responds in a fundamentally different fashion from that of a single electron counterpart. The strong highly nonlinear coupling which develops between the radiation field and the atom can result in the transfer of energy by a direct intra-atomic process to inner-shell excitations. These coherent atomic motions, which can be related to fast atom-atom encounters (> 10 MeV/amu), should enable the selective excitation of atomic inner-shell states in the KeV range to be produced by intense irradiation of atoms at ultraviolet wavelengths.
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Rhodes, C.K. (1985). Studies of multiquantum processes in atoms. In: Ehlotzky, F. (eds) Fundamentals of Laser Interactions. Lecture Notes in Physics, vol 229. Springer, Berlin, Heidelberg. https://doi.org/10.1007/3-540-15640-2_40
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DOI: https://doi.org/10.1007/3-540-15640-2_40
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