On ionization energy losses of relativistic particles created in matter

The ionization energy loss of high-energy particles created in matter is considered. The analogy between interference phenomena in ionization energy losses after photoproduction in matter of ultrarelativistic electron-positron pairs and after decay of fast molecules in thin target is noted. It is demonstrated that after generation of ultrarelativistic electron in matter, for impact parameters making the main contribution to the ionization energy losses, the interference of the electrons own Coulomb field and the radiated electromagnetic wave is substantial. However, this interference phenomenon practically has no effect on the ionization energy losses of the particle