The Iron Project: R-Matrix calculations for atomic data and spectral features of Fe-peak elements Ti I and Cr I

Ti is found on our earth and exoplanets, red giants and supergiants. It combines easily with oxygen and regulates the emitting flux of red giants. Cr I has been found in stars and also in interstellar medium. Spectral analysis of their presence require both oscillator strengths for bound-bound and photoionization cross sections for bound-free transitions. Oscillator strengths largely account for the spectral line strengths and features in the spectra. We will present atomic data for oscillator strengths and spectral features of Ti I and Cr I. The results for dipole allowed transitions were obtained using R-matrix method in LS coupling and split in to fine structure components using algebraic transformation. Using a close coupling wavefunction expansion for Ti I that includes 36 LS states of the core ion Ti II [1] produces 908 bound states that produced 33203 LS multiplets. Fine structure split produced 270423 transitions. The Cr I wavefunction expansion includes 40 states of the core ion Cr II [2]. There are 134 bound septet and quintet bound states are found that can form coupling to the ground state $^6S$ of the core ion Cr II and produced 1035 LS multiplets. Additionally, lifetimes and forbidden transitions obtained from atomic structure code SUPERSTRUCTURE will also be presented.