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arXiv physics/0307114physics.atom-ph
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类氢离子双光子电离的相对论效应和延迟效应

Relativistic and retardation effects in the two--photon ionization of hydrogen--like ions

Peter Koval, Stephan Fritzsche, Andrey Surzhykov

摘要:

从狄拉克方程出发,用二阶微扰理论研究了类氢离子的非共振双光子电离。为了对完整的库仑谱进行求和,采用格林函数方法计算电离截面。精确的二阶相对论截面进行比较,从相对论长波近似以及从非相对论结果的缩放获得的数据。对于高Z离子,相对论波函数收缩可能会降低双光子电离截面的两倍或更多的因素,而延迟效应似乎不太明显,但仍然引起不可忽略的贡献。

英文摘要:

The non-resonant two-photon ionization of hydrogen-like ions is studied in second-order perturbation theory, based on the Dirac equation. To carry out the summation over the complete Coulomb spectrum, a Green function approach has been applied to the computation of the ionization cross sections. Exact second-order relativistic cross sections are compared with data as obtained from a relativistic long-wavelength approximation as well as from the scaling of non-relativistic results. For high-Z ions, the relativistic wavefunction contraction may lower the two-photon ionization cross sections by a factor of two or more, while retardation effects appear less pronounced but still give rise to non-negligible contributions.

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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