Isotope shifts and electron densities in W I. I. Parametric analysis and theoretical field shifts
Isotope shifts and electron densities in W I. I. Parametric analysis and theoretical field shifts
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W I. I. 中的同位素位移和电子密度。参数分析和理论场位移
DOI：
10.1088/0953-4075/21/12/010
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发表时间：
1988
期刊：
影响因子：
--
通讯作者：
E. Wobker
中科院分区：
文献类型：
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作者：
P. Aufmuth;A. Steudel;E. Wobker
通过光电记录法布里-珀罗光谱仪，使用高浓缩同位素样品对 182,184W、184,186W 和 182,186W 进行数字数据处理，研究了钨弧光谱中八线的同位素位移。通过参数方法分析观察到的变化。对于同位素对 184,186W，g2 参数在 5d56s 7S 和 5S 的场位移之间产生 34 (3) mK 的差异。这种差异是由静电算子和场移算子的相互作用产生的。它表明 5d56s 项的场偏移的交叉二阶效应的很大贡献。根据s参数和其他光学测量，184W和186W之间的核参数λδ(r2)被评估为0.084(7)fm2。还可以证明自旋相关效应。将实验数据与混合配置 5d 46s2、5d56s 和 5d6 的所有项的非相对论 Hartree-Fock 计算结果进行比较。使用经验比例因子 S*(74) = 1.32(9)，一致性非常令人满意。
The isotope shift in the arc spectrum of tungsten was studied in eight lines by means of a photoelectric recording Fabry-Perot spectrometer with digital data processing for 182,184W, 184,186W and 182,186W with the use of highly enriched isotope samples. The observed shifts were analysed by means of the parametric method. For the isotope pair 184,186W the g2 parameter yields a difference of 34 (3) mK between the field shifts of 5d56s 7S and 5S. This difference is produced by the interaction of the electrostatic operator and the field-shift operator. It indicates a large contribution of crossed-second-order effects of the field shift of the terms of 5d56s. From the s parameter and other optical measurements, the nuclear parameter lambda δ(r2) between 184W and 186W was evaluated to be 0.084 (7) fm2. It was also possible to demonstrate spin-dependent effects. The experimental data are compared with results from non-relativistic Hartree-Fock calculations for all the terms of the mixing configurations 5d 46s2, 5d56s and 5d6. Using an empirical scaling factor, S*(74) = 1.32(9), the agreement is very satisfactory.