ELECTRON COLLISIONS WITH VERY HIGHLY-CHARGED IONS - RELATIVISTIC CALCULATIONS

Cross sections for electron impact ionization of H-like U, Bi, Au, Dy, Ba, Mo, Kr and Fe ions out of the Is groundstate for incident electro n energies up to about six times the ionization energy have been calcu lated by the relativistic distorted wave method of Pindzola et al. (Ph ys. Rev. A (1989) 4911 [1]), including exchange and using the Moeller interaction. When Coulomb, magnetic, retardation and electron exchange are all included, the results are in good agreement with measurements using the Electron Beam Ion Trap reported by Marrs et al. (Phys, Rev. Lett. 72 (1992) 4052 [3]) for U at an incident electron energy of 198 keV.