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Observation of (3d4p→3d4d) and (3d4d→3d4f) transitions in the vacuum ultraviolet spectra of calcium-like Mn VI, Fe VII and Co VIII

An analysis of the spectra of calcium-like Mn VI, Fe VII and Co VIII in the 550-1375 Å wavelength region is reported following observations involving collision-based spectroscopy of ion-rare-gas collisions in an ion beam from an ECR ion source. The strongest lines were found to originate from 3d4s→3d4p and 3d4d→3d4f transitions in the spectra of Mn5+ and from 3d4p→3d4d and 3d4d→3d4f transitions in the spectra of Fe6+ and Co7+ and were classified using multiconfiguration Hartree-Fock calculations and isoelectronic comparison. This permitted the location of the 3d4f3H levels in these ions and established the energies of 14 of the levels in Fe VII and 13 of the levels in Co VIII of the 3d4d configuration for the first time.