Calculation of fine-structure energy levels and autoionizing widths for the magnesium-like ions Ti XI and Fe XV

We have calculated highly excited fine-structure energy levels and their autoionizing widths for the 3pns 3P1(n=9–33), 3pns 1P1(n=9–27), 3pnd 3D1(n=9–35), 3pnd 3P1(n=8–26), 3pnd 1P1(n=8–26), 3dnp3D1(n=6,8–29), 3dnp3P1(n=6,8–29), 3dnp 1P1(n=6,8–28), 3dnf 3D1(n=7–28), 3dnf 3P1(n=7–27), and 3dnf 1P1(n=7–27) states of the magnesium-like ion Ti XI and for the 3pns 3P1(n=10–35), 3pns 1P1(n=10–25), 3pnd 3D1(n=10–35),3pnd 3P1(n=10–25),3pnd 1P1(n=10–24),3dnp 3D1(n=7,9–31),3dnp 3P1(n=7,9–31),3dnp 1P1(n=7,9–28),3dnf 3D1(n=9–30),3dnf 3P1(n=9–28), and 3dnf 1P1(n=9–28) states of the magnesium-like ion Fe XV. The calculations are based on the relativistic Breit–Pauli R -matrix approximation combined with the QB method [L. Quigley, K. Berrington, J. Pelan, Comput. Phys. Commun. 144 (1998) 225]. We report many previously unpublished energy values and autoionizing widths for these magnesium-like ions.