Low-speed limit of Bohr’s stopping-power formula

Bohr’s classical (nonrelativistic) model of charged-particle stopping is evaluated explicitly for arbitrary values of projectile charge and speed. This removes the logarithmic cutoff from the original expression and generates a stopping formula which can be utilized also to extend the range of practical applicability of Bloch’s theory. As expected such a formulation appears to be a better starting point than the Born approximation for estimating stopping powers of heavy ions at velocities v${\mathit{Z}}_1$${\mathit{e}}^2$/ħ. © 1996 The American Physical Society.