Abstract
Angular and energy-dependent photon distributions emitted from $50\text{\ensuremath{-}}\mathrm{keV}$ to $2.5\text{\ensuremath{-}}\mathrm{MeV}$ 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 $100\phantom{\rule{0.16em}{0ex}}\mathrm{keV}$, 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.
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