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Abstract: K-shell ionization cross-sections and mean vacancy sharing probabilities measured in the near-symmetric collision systems Fe, Co, Cu+Cr and Fe+Cu at 0.2–1.75MeV/u energies are reported. Beams of 56Fe, 59Co and 63Cu q+ ions (3⩽ q ⩽12) delivered by the Van de Graaff tandem accelerator of NIPNE Bucharest were used. The cross-section values have been corrected for multiple ionization in the outer (L,M) shells by using the energy and yield shift method. Mean ionization probabilities per electron in the outer shells have been estimated. Calculations in the Briggs model, using SCA with relativistic hydrogenic wave functions and binding energy corrections, could explain the 2pσ-molecular orbital ionization cross-sections at higher energies (⩾1MeV/u). The vacancy sharing results show that predictions of the two-state coupling Demkov–Meyerhof model are less fulfilled at higher energies (⩾1.5MeV/u). [Copyright &y& Elsevier]

Vacancy production in 0.1–1.75 MeV/u Mn, Fe, Co, Ni, Cu + Au, Bi collisions has been studied by measuring integral inner-shell ionization cross-sections and mean outer-shell ionization probabilities at the Tandem accelerator of NIPNE, Bucharest. X-ray spectra induced by ion beams of Mn, Fe, Co, Ni and Cu impinging on thin solid-foil targets of Au and Bi have been measured. Total ionization cross-sections for the K-shell of the projectile and L3-subshell of the target, as well as vacancy sharing probabilities, corrected for the effect of multiple ionization, are reported. The experimental results are discussed in terms of two model calculations. [Copyright &y& Elsevier]