Electron Spin Resonance of Fe³⁺-Associated Centers in Cadmium Selenide

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Electron spin resonance of a Fe³⁺-associated center in cadmium selenide has been observed at liquid helium temperatures. The center responsible for the resonance has been identified as being a Fe³⁺ ion occupying a cadmium site that is associated with a negatively charged defect on one of the six cadmium sites nearest to the Fe³⁺ ion. The spin Hamiltonian for a Fe³⁺ center of orthorhombic symmetry having S=5⁄2 is (Remark: Graphics omitted.), where the y-axis is rotated 16.5° away from the c-axis toward the line connecting a Fe³⁺ ion with one of the six cadmium site nearest Fe³⁺ and the x-axis lies in the (11\bar20) plane containing the y-axis. The effective g-values for the transition within the lowest Kramers doublet are given by g_x=0.91±0.02, g_y=9.24±0.06, and g_z=1.68±0.03. The intensity variation of the resonance signal with irradiation of light of various wavelengths has been measured and can be interpreted in terms of the process of hole transfer from cadmium vacancies or isolated Fe³⁺ ions and the process of recombination with the electrons excited from Fe²⁺ ions into the conduction band.