Optical Spectra of Y₃Fe₅O₁₂ (YIG) in the Y³⁺ 4p Core Excitation Region

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Reflectivity spectrum of YIG was measured at room temperature in the Y³⁺, 4p core excitation region. The optical constants are obtained by a multi-angle method. Two broad spectral bands at 29.3 and 33.3, eV and five small structures at 20.2, 22.5, 27.3, 36.5 and 40, eV were newly found in ε ₂ spectrum. The spectral structures are assigned; the large spectral band at 33.3, eV is made up of two transitions from Y, 4p^{6 1}S₀ to Y, 4p⁵, 5s¹ (3/2, , 1/2), (1/2, , 1/2), where the first member in the parenthesis indicates the total angular momentum j of hole and second specifies j of electron, the structure 29.3, eV is made of a transition to Y, 4p⁵, 4d^{1 1}P₁. In YIG the energy positions of Y, 4p⁵, 5s¹ (3/2, , 1/2), (1/2, , 1/2) are about same in Y³⁺ free ion, but Y, 4p⁵, 4d^{1 1}P₁ is shifted by 5.7, eV.