Abstract

The spectra of luminescence and magnetic circular polarization of luminescence of praseodymium–yttrium aluminum garnet Pr³⁺ : Y₃Al₅O₁₂ (PrYAG) are studied in the visible spectral region at temperature T = 300 K. An analysis of spectral dependences of magnetooptical and optical spectra makes it possible to identify optical 4 f–4 f-transitions between Stark sublevels of multiplets ³P₀, ³P₁, ³Н₅, and ³Н₆ in PrYAG. It was shown that an important role in the spectrum of the degree of magnetic circular polarization of luminescence of this paramagnetic garnet is played by the effect of quantum-mechanical J–J mixing of states of Stark singlets ³Н₅ and ³Н₆ of non-Kramer rare-earth ion Pr³⁺ in the “green” luminescence band related to forbidden 4 f → 4 f transition ³P₀ → ³Н₅ in the visible spectral region. To interpret the spectra of magnetic circular polarization of luminescence, the energy of experimentally determined Stark sublevels of multiplets under study, their irreducible representations and wave functions determined by numerical simulation of the energy spectrum of the rare-earth ion Pr³⁺ in the garnet structure are used.

中文翻译：

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稀土离子Pr 3+激发态的J–J相互作用对Pra-钇铝石榴石磁极化发光的影响

摘要

研究了T-钇铝石榴石Pr ³⁺：Y ₃ Al ₅ O ₁₂（PrYAG）在温度T = 300 K时的发光光谱和磁圆极化光谱。对磁光光谱的依赖性进行了分析。和光谱使得能够识别光学4个 ˚F -4  ˚F多重斯塔克能级之间-transitions ³ P ₀，³ P ₁，³ Н ₅，和³ Н ₆在PrYAG中。结果表明，在该顺磁性石榴石的发光磁性圆偏振度的光谱的重要角色由量子力学的效果发挥Ĵ - Ĵ的斯塔克单峰态混合³ Н ₅和³ Н ₆的非-Kramer稀土离子镨³⁺在与禁止4“绿色”发光带 ˚F →4  ˚F过渡³ P ₀ → ³ Н ₅在可见光谱区域。为了解释发光的圆磁化光谱，研究确定的实验中多重态的Stark亚能级的能量，其不可还原的表示以及通过石榴石结构中稀土离子Pr ^3+的能谱的数值模拟确定的波函数被使用。