Equilibrium charge-state fractions and average charges of low-charged Hf, W and Os ions passing through He target at ion energies E = 0.5–25 keV/u

Equilibrium charge-state fractions Fq and average charges 〈q〉 are calculated for low-charged Hfq+, Wq+ and Osq+ ions with the charges q = 0–3 colliding with He atoms at energies E = 0.5–25 keV/u. Fq and 〈q〉 values are obtained on the basis of electron-capture and electron-loss cross sections calculated by ARSENY and DEPOSIT codes briefly described in the paper. Calculated cross sections, Fq and 〈q〉 values, calculated also for other low-energy ion–atom collisions, are compared with available experimental data. The present results may be of interest for specialists studying low-energy beams of rare isotopes of Hf, W and Os ions.