  We have studied the absorption spectra of x-ray irradiation-induced Ce2+ and
Pr2+ ions in crystals of alkaline-earth fluorides. We have calculated
absorption spectra of divalent praseodymium ions in SrF2 crystals doped with
Pr2+ for the first time. The calculated spectra agree rather well with the
experimental data. In crystals containing induced Ce2+ ions we have found
strong electron-phonon coupling. In BaF2, we do not observe bands corresponded
to divalent Ce or Pr ions.
