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We study electron loss from a hydrogen-like highly charged ion by the impactof equivelocity electrons and protons and also in collisions with hydrogen andhelium. The collision velocity $v$ varies between $v_{min}$ and $v_{max}$,where $v_{min}$ and $v_{max}$ correspond to the energy threshold$\varepsilon_{th}$ for electron loss in collisions with a free electron and to$\approx 5 \, \varepsilon_{th}$, respectively. Our results show that in thisrange of $v$: i) compared to equivelocity electrons protons are more effectivein inducing electron loss (due to a substantially larger volume of theeffectively available final-state electron momentum space), ii) the relative(compared to protons) effectiveness of electron projectiles grows with increasein the atomic number of a highly charged ion, iii) a substantial part of thevolume of the final-state-electron momentum space, kinematically available incollisions with electrons, is weaker populated in collisions with protons thanwith electrons, iv) even when the total loss cross sections in collisions withelectrons and protons become already equal the spectra of the outgoingelectrons still remain quite different in almost the entire volume of thefinal-state-electron momentum space. The points i) and iii), in particular,mean that in collisions with hydrogen target the contributions to the lossprocess from the interactions with the nucleus and the electron(s) of the atomwould be to a large extent separated in the final-state-electron momentumspace.

Electron loss from hydrogen-like highly charged ions in collisions with electrons, protons and light atoms