High-Energy Bremsstrahlung in Collisions of Electrons with One- and Two-Electron Atoms

A brief discussion of the fundamental formulas for electron-electron and electron-atom bremsstrahlung is given. Some general results are given for complex atoms and explicit expressions for the cross sections for one- and two-electron atoms are exhibited graphically. It is shown that for $1e$ and $2e$ atoms which have a residual charge, that is, for ions, the total cross section is composed of several terms, one of which is ${(Z\ensuremath{-}1)}^{2}$ or ${(Z\ensuremath{-}2)}^{2}$ (respectively) times the cross section for electrons incident on unshielded protons. Some results for general atoms or molecules in the high- and low-energy limits are indicated.