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We show that the 3D charged Banados-Teitelboim-Zanelli (BTZ) black hole solution interpolates between two different 2D AdS spacetimes: a near-extremal, nearhorizon AdS 2 geometry with constant dilaton and U(1) field and an asymptotic AdS 2 geometry with a linear dilaton. Thus, the charged BTZ black hole can be considered as interpolating between the two different formulations proposed until now for AdS 2 quantum gravity. In both cases the theory is the chiral half of a 2D CFT and describes, respectively, Brown-Hennaux-like boundary deformations and near-horizon excitations. The central charge c as of the asymptotic CFT is determined by 3D Newton constant G and the AdS length l, c as = 3l/G, whereas that of the near-horizon CFT also depends on the U(1) charge Q, c nh ∝ lQ/ √ G.

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Photoionization of the I + ion in the energy range of the 4d giant resonance has been studied using our recently developed open-shell random phase approximation with exchange (RPAE) method. Photoionization cross sections for the I + 4d-f, p, 5s-p, 5p-s, d have been obtained for each term of the ground configuration. Calculations include all the intra-shell and inter-shell coupling among the 4d, 5s and 5p subshells. Our maximum cross section in the energy region of the I + 4d giant resonance, 23.6 Mb at 90.9 eV, is in excellent agreement with the recent measurement, 23(3) at 90 eV.

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