Abstract
The electron spin resonance spectrum of Ta 4+ ions has been investigated in LiTaO 3. These defects were produced either by irradiating as-grown crystals with X-rays or by optically bleaching crystals that had been previously reduced. In both cases, the Ta 4+ ions were stable only at temperatures near or below 77 K. The g and hyperfine matrix parameters for the Ta 4+ spectrum are g ‖ = 1.503, g ⊥ = 1.172, A ‖ = ∼0, and A ⊥ = 699 MHz. These parameters describe a 5d 1 electron on the tantalum ion, and we conclude that the defect represents a “self-trapped” electron at the normal Ta 5+ site.
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