Rydberg series obsd. in the excitation spectra of Cl and H atoms isolated in the rare gas (Rg) crystals Kr and Xe are assocd. with the charge transfer species Cl-Rg+ and H-Rg+. The progressions originate from hole states of Rg+ which converge to the top of the rare gas valence band in an analogous manner to the convergence of conventional exciton states to the bottom of the conduction band. A model based on the effective mass approxn. and a quantum defect concept predicted such progressions in Xe and Kr crystals and it is supported by the present results. In addn. to these data a review is given of similar results with other halogens and rare gases. [on SciFinder (R)]