  In order to provide atomic data needed for astrophysical investigations, a
set of electron-impact broadening parameters for ionized rare-earth element
lines should be calculated. We are going to calculate the electron-impact
broadening parameters for more than 50 transitions of ionized rare-earth
elements. Taking into account that the spectra of these elements are very
complex, for calculation we can use the modified semiempirical approach - MSE
or simplified MSE. Also, we can estimate these parameters on the basis of
regularities and systematic trends.
