Charge Transfer Spectra of Transition Metal Ions in Cadmium Halide Lattices

Abstract

The near ultraviolet spectra of CdCl, and CdBr, crystals doped with Fez+, Coz+, and Niz+ at 4.2 K and the magnetic circular dichroism spectra of Fez+, CoZ+, and Ni2+ doped in CdBr, are measured. The intense bands observAd in the spectra are assigned to charge transfer transitions between the halide ions of the crystal lattice and the 3d orbitals of the guest ion.Die W-Spektren von mit Fez+, Cot+ und Ni*+ dotierten CdC1,-und CdBr2-Kristdlen sowie die Spektren des magnetischen Zirkulardichroismus von Fez+, Coz+ und Niz+ in CdBr werden bei 4,2 K gemessen. Die in diesen Spektren beobachteten intensiven Banden werden LadungstransferVbergiingen zwischen den Halogenionen des Kristallgitters und den 3d-Orbitalen des Gastions zugeordnet.

Optical absorption spectra of Fe2+ and Fe3+ in aqueous solutions and hydrated crystals

“…spectra of Fe 2+ in LiCl (Li-Cl separation is 2.56 Å) and CdCl 2 (Cd-Cl separation is 2.74 Å) in which the first C.T. transition occurs in the 43000 -46000 cm -1 region [9][10][11]. These conclusions are not consistent with the empirical "optical electronegativity scale" by Jørgensen [12], [5, pag.…”

Investigations of the electron paramagnetic resonance parameters and defect structures for Ni2+ ions in CdX2 (X=Cl, Br) crystals

“…E n is the CT energy level. From the optical spectra of CdX 2 :Ni 2 [18], we have E n E37,700 and 28,900 cm À1 for X ¼ Cl and Br, respectively. The zero-order energy denominators…”