Electronic absorption spectrum of nickel(II) in cubic perovskite fluorides. III. The ultraviolet spectrum

Abstract

The ultraviolet absorption spectrum of divalent nickel is shown to be dependent on concentration for crystals of composition KMg_xNi_l-_xF₃ with 0 < x < 1. The eight ultraviolet absorption bands have intensities which are directly related to the number of nearest neighbour nickel ions per nickel ion. Three of the bands can be assigned to states of the ¹G and ¹S terms while the remaining five have energies which can be equated to combinations of the energies of the excited singlet states ^lEg^{a I}T^a_2g and ¹A^a_g and are simultaneous electronic excitations.