A new electron spin paramagnetic resonance spectrum in CaF2 doped with uranium is attributed to U4+. The spectrum possesses axial symmetry about the 〈111〉 directions and is describable by a spin Hamiltonian with g⊥=0±0.15 and gII=3.238±0.005 at 4.2°K. The trigonal symmetry is due to the presence of charge compensating O2- ions along the 〈111〉 directions. The spectrum is absent in crystals grown under reducing conditions. Similar results were also observed in SrF2 and BaF2.
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机译：掺杂铀的CaF2中新的电子自旋顺磁共振谱归因于U4 +。该光谱在＆ 111＆方向上具有轴对称性，并且可由4.2°K下的g 1 ＝ 0±0.15和g II ＝ 3.238±0.005的自旋哈密顿量描述。三角对称性是由于沿<111>方向存在电荷补偿性O2-离子。在还原条件下生长的晶体中不存在该光谱。在SrF2和BaF2中也观察到类似的结果。
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