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首页> 外文期刊>Applied Magnetic Resonance >Superhyperfine Structure of EPR Spectra in LiLuF4:U3+ and LiYF4:Yb3+ Single Crystals
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Superhyperfine Structure of EPR Spectra in LiLuF4:U3+ and LiYF4:Yb3+ Single Crystals

机译:LiLuF4 :U3 + 和LiYF4 :Yb3 + 单晶中EPR光谱的超超细结构

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Electron paramagnetic resonance (EPR) spectra of doped paramagnetic crystals LiLuF4:U3+ and LiYF4:Yb3+ have been investigated at a frequency of about 9.42 GHz in the temperature range of 10–20 K. The U3+ ion spectrum is characterized by g-factors g ∥ = 1.228 and g ⊥ = 2.516, and contains the hyperfine structure due to the 235U isotope with nuclear spin I = 7/2 and natural abundance of 0.71%. The observed hyperfine interaction constants are A ∥ = 81 G and A ⊥ = 83.8 G. Moreover, the spectrum reveals the well-resolved superhyperfine structure (SHFS) due to two groups of four fluorine ions forming the nearest surrounding of the U3+ ion. This SHFS contains up to nine components with the spacing between components being about 12.7 G. The SHFS is observed also in the EPR spectrum of the LiYF4:Yb3+ crystal; up to 17 components with spacing of about 3.7 G may be traced. Some parameters of the effective Hamiltonian of the SHF interaction are estimated, the contribution of covalent bonding of f-electrons with ligands into these parameters is discussed.
机译:掺杂的顺磁性晶体LiLuF4 :U3 + 和LiYF4 :Yb3 + 的电子顺磁共振(EPR)光谱在10°C的温度范围内于9.42 GHz的频率下进行了研究。 –20K。U3+ 离子光谱的特征在于g因子g∥ = 1.228和g⊥ = 2.516,并且由于235 U而包含超精细结构核自旋I = 7/2和自然丰度为0.71%的同位素。观察到的超精细相互作用常数为A∥ = 81 G和A⊥ = 83.8G。此外,该光谱还揭示了由于两个四氟离子形成了两个基团,从而可以很好地分辨超超精细结构(SHFS)。 U3 + 离子的最近周围。该SHFS包含多达9个组分,这些组分之间的间距约为12.7G。在LiYF4 :Yb3 + 晶体的EPR谱中也观察到了SHFS。可以追踪多达17个组件,间距约为3.7G。估计了SHF相互作用的有效哈密顿量的一些参数,并讨论了f电子与配体的共价键对这些参数的贡献。

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