The Iron Project & The Opacity Project: i) Radiative data for the solar iron opacity, ii) Cl II-III spectra*

From the on-going progress report of the radiative processes, particularly photoionization, for the 3 iron ions, Fe~XVII-XIX, dominant at the boundary of the convection and radiative zones (BCZ) inside the Sun where the plasma temperature is $2.11 imes 10^6$K and the electron density is $3.1 imes 10^{22}$cc the atomic data have now been implemented for determination of solar iron opacity at BCZ. Prelimiary results on opacity will be presented at the meeting. In this report an overall summany will be given of the radiative data for bound-bound transitions, the number of energy levels (with $nleq$10 and $lleq$9) and photoionization cross sections of these levels, of these ions that were needed for the opacity calculations. Features of photoinization depends on the state of the ion, such as, ground state, equivalent electron states, low and high energy states. Comparision of features of photoionization of the 3 Fe ions will be illustrated in order to understand the impact of them on the photoabsorption of the ions in determination of the opacity. The present work also reports, as part of work under the Iron Project, the predicted spectra of Cl II and Cl III that can assist in searching the signals of these ions in astrophysical spectra. The oscillator strengths for the bound-bound transitions in these two ions have been obtained in the relativistic Breit-Pauli R-matrix method.