采用相对论多组态Dirac-Hartree-Fock方法对Mg原子同位素位移的理论研究

发布时间：2019-03-15 12:57

【摘要】：利用相对论多组态Dirac-Hartree-Fock方法研究了Mg原子基态到低激发态~1S_0-~1P_1和~1S_0-~3P_1两条跃迁谱线的同位素位移参数,包括正常质量位移系数,特殊质量位移系数和场位移因子,并计算了~(24)Mg,~(25)Mg和~(26)Mg三个稳定同位素的同位素位移.在计算中采用了一种受限制的双电子激发模式,并将同位素位移计算结果与已有的实验测量和理论计算结果进行了对比.结果表明,用本文的研究方法计算的Mg原子同位素位移与其他理论结果和实验测量值十分符合.本文的计算结果可以为~(20-40)Mg同位素位移测量实验提供必要的参考,所用的计算方法也可以应用到其他类Mg体系(核外电子数等于12的离子)等多电子离子的光谱结构计算和同位素位移的研究中.
[Abstract]:In this paper, the relativistic multi-configuration Dirac-Hartree-Fock method is used to study the isotopic displacement parameters, including the normal mass displacement coefficients, of the transition lines from the ground state to the low excited state ~ 1S_0-~1P_1 and ~ 1S_0-~3P_1 of the Mg atom. The special mass displacement coefficient and field displacement factor have been calculated, and the isotopic displacements of the stable isotopes ~ (24) Mg,~ _ (25) Mg and ~ (26) Mg have been calculated. A restricted two-electron excitation mode is used in the calculation, and the calculated results of isotope displacement are compared with the experimental and theoretical results. The results show that the Mg atomic isotope shifts calculated by this method are in good agreement with other theoretical results and experimental measurements. The calculated results in this paper can provide the necessary reference for the ~ (20) Mg isotope displacement measurement experiment. The calculation method used in this paper can also be applied to the calculation of spectral structure and isotope shift of multi-electron ions such as other Mg systems (ions with the number of extra-nuclear electrons equal to 12).
【作者单位】：成都大学信息科学与工程学院;湖北师范大学物理与电子科学学院;中国海洋大学信息科学与工程学院;西安建筑科技大学理学院;
【基金】：国家自然科学基金(批准号:11304093,11604253) 陕西省青年科技新星项目(批准号:2015KJXX-33) 四川省教育厅科研基金(批准号:14ZB0375)资助的课题~~
【分类号】：O562.6

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