On the 3p-subshell photoabsorption spectra of iron-group ions: The case of Mn²⁺

The photoabsorption spectrum of doubly ionized manganese in the 45-75 eV photon energy range, where inner-shell 3p-3d and 3p-4s (and higher 3p-nl) transitions are induced, has been measured using a dual laser plasma technique. It compares favourably with the theoretical cross-section profile of Dolmatov (1996 J. Phys. B: At. Mol. Opt. Phys. 29 L687) and confirms his prediction that, between Mn⁺ and Mn²⁺, not only do the 3p-4s resonances swap over to the high energy side of the giant 3p-3d resonance but also that this reordering has significant effects on resonance profiles in doubly ionized manganese.