SPECTROSCOPIC STUDIES AND CRYSTAL-FIELD ANALYSES OF AM3+ AND EU3+ IN THE CUBIC-SYMMETRY SITE OF THO2
SPECTROSCOPIC STUDIES AND CRYSTAL-FIELD ANALYSES OF AM3+ AND EU3+ IN THE CUBIC-SYMMETRY SITE OF THO2
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DOI：
10.1103/physrevb.48.5751
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发表时间：
1993-09-01
影响因子：
3.7
通讯作者：
EDELSTEIN, N
中科院分区：
文献类型：
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作者：
HUBERT, S;THOUVENOT, P;EDELSTEIN, N
荧光和激发光谱的Am-3+稀释在ThO 2的报道在室温和液氦温度沿着与荧光数据的Eu 3+稀释在ThO 2。Eu ~（3+）的数据主要是磁偶极跃迁，而Am ~（3+）的数据主要是声子辅助电偶极跃迁。早期的电子顺磁共振（EPR）数据Pu-3+稀释在ThO 2中，已经对该系统的晶场参数B-0（4）/B-0（6）的可能比值设定了限制。假设Am-3+-ThO 2的跃迁比例相同，对观察到的跃迁进行了归属，得到了晶体场参数B-0（4）= -6731 cm-1，B-0（6）= 714 cm-1。B-0（4）值与早先在UO 2和NpO 2的非弹性中子散射实验中发现的数量级相同，但Am-3+-ThO 2的B-0（6）比中子实验中确定的小得多。
Fluorescence and excitation spectra of Am-3+ diluted in ThO2 are reported at room and liquid-helium temperatures along with fluorescence data for Eu3+ diluted in ThO2. The Eu3+ data Can be assigned primarily to magnetic-dipole transitions, but the Am-3+ data appear to be primarily phonon-assisted electric-dipole transitions. Earlier electron-paramagnetic-resonance (EPR) data on Pu-3+ diluted in ThO2 have set limits on the possible ratios of the crystal-field parameters B-0(4)/B-0(6) for this system. Assuming the same ratio should hold for Am-3+-ThO2, the observed transitions were assigned and the values for the crystal-field parameters B-0(4) = -6731 cm-1, B-0(6) = 714 cm-1 were obtained. The B-0(4) value is the same order of magnitude as found earlier in inelastic-neutron-scattering experiments for UO2 and NpO2, but B-0(6) for Am-3+-ThO2 is much smaller than determined in the neutron experiments.