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Mangiarotti, A.; Jakubassa-Amundsen, D. H. (2017): Higher-order theories for relativistic electron-atom bremsstrahlung in comparison with experiment. In: Physical Review A, Vol. 96, No. 4, 42701
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The analytic Sommerfeld-Maue theory, including the next-to-leading-order correction, and the relativistic Dirac partial-wave theory are probed by a systematic comparison of the bremsstrahlung spectra with available experimental data. These measurements cover a wide range of nuclear charge numbers (13 <= Z <= 79), collision energies (1-10 MeV), and photon angles (4 degrees <= theta(k) <= 60 degrees). It is found that the analytic model performs well for Z <= 13 at all angles down to very low photon frequencies. For high charge numbers, at high photon energies (i.e., in the short-wavelength limit) or for the larger angles at all photon energies, the partial-wave theory has to be used. For intermediate Z <= 50, the maximum angle up to which the analytic formulae can be used decreases with increasing Z.