(E,2E) Processes on Isoelectronic Hydrogen- and Alkali-Like Ions: Scaling Laws
Triple differential cross sections (TDCSs) for (e, 2e) processes on the valence electrons of H-, Li-, Na- and K-like positive ions are calculated for intermediate incident energies in asymmetric and symmetric coplanar geometries. The long-range Coulomb interaction in the initial and final channels, and the short-range effects, are taken into account in the Coulomb Born approximation through the use of two effective charges. The latter are obtained within the framework of the frozen-core Hartree-Fock approximation which is also used for describing the bound states wave functions. As one moves from the H-like to K-like sequences, more TDCS structure is observed. An approximate scaling law for the TDCSs is predicted for the ionization of sequences of isoelectronic ions, provided the energies are properly scaled. The calculations illustrate that the scaling is generally well verified, in particular for increasing ionicity within a sequence.
Keywords(e,2e) proscesses scaling laws ionization of ions
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