Electron-impact ionization of hydrogen-like iron ions

Electron-impact ionization cross sections have been determined for hydrogen like iron ions at selected electron energies between 1.45 and 4.3 times th e threshold energy. The cross sections were obtained by measuring the equil ibrium ionization balance in an electron beam ion trap. This ionization bal ance is obtained from x-ray measurements of radiative recombination into th e K-shell of hydrogen-like and bare iron ions. The measured cross sections are compared with distorted-wave calculations and several semiempirical for mulations.