Large-scale multiconfiguration Dirac-Hartree-Fock calculations for astrophysics: n=4 levels in P-like ions from Mn~XI to Ni~XIV

Using the multiconfiguration Dirac-Hartree-Fock and the relativistic configuration interaction methods, a consistent set of transition energies and radiative transition data for the lowest 546 (623, 701, and 745) states of the 3p(4)3d, 3s3p(2)3d(2), 3s(3)p(3)4p, 3s3p(4), 3s(2)3d(3), 3s(2)3p(2)3d, 3s(2)3p(2)4d, 3s(2)3p(2)4s, 3p(3)3d(2), 3p(5), 3s(3)p(3)d(3), 3s3p(3)3d, 3s3p(3)4s, 3s(2)3p3d(2), 3s(2)3p(2)4p, and 3s(2)3p(3) configurations in Mn XI (Fe XII, Co XIII, and NI XIV) is provided. The comparison between calculated excitation energies for the n = 4 states and available experimental values for Fe xii indicate that the calculations are highly accurate, with uncertainties of only a few hundred cm(-1). Lines from these states are prominent in the soft X-rays. With the present calculations, several recent new identifications are confirmed. Other identifications involving xii that were found to be questionable are discussed and a few new assignments are recommended. As some n = 4 states of the other ions also show large discrepancies between experimental and calculated energies, we reassess their identification. The present study provides highly accurate atomic data for the n = 4 states of P-like ions of astrophysical interest, for which experimental data are scarce.