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arXiv 0908.2498physics.atom-ph
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类氢离子双光子衰变率的负连续效应

Negative continuum effects on the two-photon decay rates of hydrogen-like ions

A. Surzhykov, J. P. Santos, P. Amaro, Paul Indelicato

摘要:

基于相对论狄拉克方程,在二级微扰理论框架下研究了类氢离子的双光子衰变。特别注意的是所产生的影响,在这样一个框架中发生的负能量(中间虚拟)状态的总和。为了研究这些态的作用,我们对中性氢H离子的$2s_{1/2} - 1s_{1/2}$和$2p_{1/2} - 1s_{1/2}$跃迁以及类氢氙离子的$^{53+}$和铀离子的$^{91+}$进行了详细的计算。我们发现,对于高- $Z$和低- $Z$原子系统,为了正确估计总衰变率和能量微分衰变率,应适当考虑狄拉克谱负能量部分的求和。

英文摘要:

Two--photon decay of hydrogen--like ions is studied within the framework of second--order perturbation theory, based on relativistic Dirac's equation. Special attention is paid to the effects arising from the summation over the negative--energy (intermediate virtual) states that occurs in such a framework. In order to investigate the role of these states, detailed calculations have been carried out for the $2s_{1/2} - 1s_{1/2}$ and $2p_{1/2} - 1s_{1/2}$ transitions in neutral hydrogen H as well as for hydrogen--like xenon Xe$^{53+}$ and uranium U$^{91+}$ ions. We found that for a correct evaluation of the total and energy--differential decay rates, summation over the negative--energy part of Dirac's spectrum should be properly taken into account both for high--$Z$ and low--$Z$ atomic systems.

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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