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arXiv physics/0305068physics.atom-phastro-ph
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单价电子原子的同位素位移计算

Isotope shift calculations for atoms with one valence electron

J. C. Berengut, V. A. Dzuba, V. V. Flambaum

摘要:

本文提出了一种计算封闭壳层上含一个价电子的原子和离子的同位素位移的从头计算方法。作为零近似,我们使用相对论性Hartree-Fock,然后计算相关修正。发展该方法的主要动机来自于分析早期宇宙中不同的同位素丰度是否会对类星体吸收光谱中观测到的异常做出贡献的需要。目前对这些异常的最好解释是假设精细结构常数α在早期较小。我们通过比较碱金属和类碱金属原子Na、Mg II、K、Ca II和Ba II的计算和实验同位素位移来测试同位素位移方法。协议被认为是好的。然后,我们计算的同位素位移的一些天文学相关的过渡SiII和SiIV,MgII,ZnII和GeII。

英文摘要:

This work presents a method for the ab initio calculation of isotope shift in atoms and ions with one valence electron above closed shells. As a zero approximation we use relativistic Hartree-Fock and then calculate correlation corrections. The main motivation for developing the method comes from the need to analyse whether different isotope abundances in early universe can contribute to the observed anomalies in quasar absorption spectra. The current best explanation for these anomalies is the assumption that the fine structure constant, alpha, was smaller at early epoch. We test the isotope shift method by comparing the calculated and experimental isotope shift for the alkali and alkali-like atoms Na, MgII, K, CaII and BaII. The agreement is found to be good. We then calculate the isotope shift for some astronomically relevant transitions in SiII and SiIV, MgII, ZnII and GeII.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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