A statistical theory of the dipole polarizability α is given for atoms and ions, described in the Thomas-Fermi model. A universal dependence of the polarizability of atoms and ions on their radius is constructed by numerical calculations. In the case of multiply-charged ions the expression for α has a simple analytical form. The results of the computation are in good agreement with available experimental and theoretical data especially when the outer electron shells are more than half-filled.
The influence of the target density on the electron-capture (EC) processes in collisions of
fast ions with atoms and molecules is considered. The partial EC cross sections
σn on the principal
quantum number n
of the scattered projectile, as well as the total
σtot = Σnσn values,
are calculated for highly charged ions interacting with gaseous and solid targets in the energy range
of E = 100 keV u−1
to 10 MeV u−1. It is shown that with the target density increasing, the populations of the excited states of
the scattered projectiles, formed via the EC channel, are drastically suppressed due to
projectile ionization by the target particles and, as a result, the total EC cross sections
decrease by orders of magnitude at low energies, while the reduction is less prominent at
high energies.
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