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- W2897224555 abstract "The semi-classical heuristic emission formula of Baier-Katkov [Sov. Phys. JETP textbf{26}, 854 (1968)] is well-known to describe radiation of an ultrarelativistic electron in strong external fields employing the electron's classical trajectory. To find the limitations of the Baier-Katkov approach, we investigate electron radiation in a strong rotating electric field quantum mechanically using the Wentzel-Kramers-Brillouin approximation. Except for an ultrarelativistic velocity, it is shown that an additional condition is required in order to recover the widely used semi-classical result. A violation of this condition leads to two consequences. First, it gives rise to qualitative discrepancy in harmonic spectra between the two approaches. Second, the quantum harmonic spectra are determined not only by the classical trajectory but also by the dispersion relation of the effective photons of the external field." @default.
- W2897224555 created "2018-10-26" @default.
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- W2897224555 date "2019-05-28" @default.
- W2897224555 modified "2023-10-04" @default.
- W2897224555 title "Semiclassical limitations for photon emission in strong external fields" @default.
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- W2897224555 doi "https://doi.org/10.1103/physreva.99.052513" @default.
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