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- W2025306144 abstract "The calculation of the S matrix for a system acted upon by an external electromagnetic field, when the fully interacting system can be represented by normalized Floquet states, is reformulated to include adiabatic switching and wave-function renormalization. This procedure yields, in general, nonvanishing matrix elements between states whose energies differ by an integral multiple of the photon energy. The induced level shifts do not disturb this condition; however, a relative level shift between the initial (in) and final (out) states is essential for a transition to occur. A numerical scheme to facilitate use of this formalism in practice has been devised and applied to a model calculation. The present nonperturbative results agree with lowest-order perturbation theory for weak fields, but deviate towards lower values at higher field strengths. Representative data for the simultaneous excitation of more than one level are presented to show that transition amplitudes are well defined in the presence of intermediate resonances. Gauge dependence of the level shifts and transition amplitudes is also studied, both theoretically and numerically." @default.
- W2025306144 created "2016-06-24" @default.
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- W2025306144 date "1993-12-01" @default.
- W2025306144 modified "2023-10-16" @default.
- W2025306144 title "Semiclassical Floquet theory of theSmatrix for electromagnetic interactions" @default.
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- W2025306144 doi "https://doi.org/10.1103/physreva.48.4539" @default.
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