ELECTRON PARAMAGNETIC RESONANCE EXPERIMENTS WITH Ti³⁺ IONS IN RbAl(SO₄)₂ ∙ 12H₂O

The paramagnetic resonance spectrum of the Ti 3+ ion in cubic RbAl(SO 4 ) 2 ∙ 12H 2 O single crystals has been studied in the {100} and {110} planes at 4.2 °K with an X-band microwave spectrometer. The spectrum, which consists of a maximum of 12 lines, has been explained by considering a model of 12 magnetic complexes which are related to each other through the symmetry elements of the T h = (2/m)3 point group of the Rb alum lattice. For the spin Hamiltonian with [Formula: see text], three g factors have been determined—1.895, 1.715, and 1.767— within an accuracy of ±0.002, indicating the existence of a crystal electric field of orthorhombic symmetry.