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Jakubassa-Amundsen, D. H.; Mangiarotti, A. (2019): Accuracy of analytical theories for relativistic bremsstrahlung. In: Physical Review A, Vol. 100, No. 3, 032703
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Angular and energy-dependent photon distributions emitted from 50-keV to 2.5-MeV electrons colliding with targets ranging from Cu to Pb are calculated using a consistent higher order analytical approach as well as the exact Dirac partial-wave theory. By comparison with exact numerical results for neutral atoms, the validity of the Olsen-Maximon-Wergeland additivity rule for handling the screening correction is probed, and its applicability for collision energies above 100 keV, if the photon frequency and emission angle are both small, is established. The comparison for a point-Coulomb field, aimed at testing the accuracy of the underlying analytical theory, reveals in most cases a deviation below 60% for Au, decreasing with target nuclear charge down to 10-20% for Cu.