DIRECT ELECTRON-IMPACT SINGLE IONIZATION OF MEDIUM-Z LONE FROM THE GROUND AND EXCITED-STATES

On the basis of CBE calculations (Coulomb-Born approximation with exch ange) of direct single ionization cross-sections, the fitting paramete rs were evaluated for the cross-sections sigma and Maxwellian rate coe fficients [nu sigma] of the target states 1s less than or equal to nl less than or equal to 6h and for the I-averaged values of sigma and [n u sigma]. The data made it possible to extrapolate the fitting paramet ers to arbitrary n-states with n greater than or equal to 7. The asymp totic behaviour of ionization cross-sections at high incident electron energies is considered as well. The results are compared with experim ental data and other calculations.