Hyperfine structure in the ground state of the stable isotopes of europium
Hyperfine structure in the ground state of the stable isotopes of europium
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铕稳定同位素基态超精细结构
DOI：
10.1098/rspa.1960.0149
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发表时间：
1960
期刊：
影响因子：
--
通讯作者：
G. K. Woodgate
中科院分区：
文献类型：
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作者：
P. Sandars;G. K. Woodgate
用原子束磁共振法测量了151Eu和153Eu基态4f7 6s2 8S7/2的超精细结构。测量了超精细结构的标志和gJ值。结果表明：gJ = 1·9935±0·0003；A(151) = - 20.0523±0.0002 Mc/s， A(153) = - 8.8532±0.0002 Mc/s， B(151) = - 0.7012±0.0035 Mc/s， B(153) = - 1.7852±0.0035 Mc/s；A(151)/ A(153) = 2·26498±0.00008,b (151)/ b(153) = 0·393 + 0.003。这些结果与由半填充的f电子壳层形成的纯8S7/2态的预期值不一致。基于自旋轨道耦合的高态混合的计算解释了gJ的差异，但不能解释超精细结构常数A和b的值，进一步的理论工作正在进行中。
The hyperfine structure of the ground state 4f7 6s2 8S7/2 of 151Eu and 153Eu has been measured by the method of magnetic resonance in an atomic beam. The sign of the hyperfine structure and the value of gJ have also been measured. The results are: gJ = 1·9935 ± 0·0003; A(151) = -20·0523 ± 0·0002 Mc/s, A(153) = -8·8532 ± 0·0002 Mc/s, B(151) = - 0·7012 ± 0·0035 Mc/s, B(153) = - 1·7852 ± 0·0035 Mc/s; A(151)/ A(153) = 2·26498 ± 0·00008, B(151)/ B(153) = 0·393 + 0·003. These results disagree with the values expected for the pure 8S7/2 state formed from a half-filled shell of f-electrons. Calculations on the basis of admixture of higher states of the configuration by spin-orbit coupling account for the discrepancy in gJ but do not explain the values of the hyperfine structure constants A and B. Further theoretical work is in progress.