Intensities in Complex Spectra of Highly Ionized Atoms

Extract

We describe a package of programs for the implementation of the collisional-radiative model to complex configurations. The number of levels taken into account may be several hundreds. The heart of the package is a very efficient program for excitation cross sections in the Distorted Wave framework, using the Relativistic Parametric Potential wave functions. The basic jj coupling scheme actually simplified the computations, enabling a useful factorization into radial and angular parts. Intermediate coupling and configuration interactions are accounted for. We computed ratios of intensities of 3d⁹ − 3d⁸4s (E2) to 3d⁹ −3d⁸4p (El) transitions as functions of n_e and T_e in Xe XXVIII and other Co-like spectra. The atomic model involves all the levels of configurations (3p⁶)3d⁹; −3d⁸4s, −3d⁸4p, −3d⁸4d, −3d⁸4f, and (3p⁵) −3d¹⁰, −3d⁹4p. (275 levels) and all the transitions between them. Results compare very well with experimental spectra from TFR.