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arXiv 1807.09650physics.atom-ph
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双中心原子系统的强场光电离

Strong-field photoionization in two-center atomic systems

J. Fedyk, A. B. Voitkiv, C. Müller

摘要:

研究了在强激光场作用下,相邻原子$B$与原子$A$的光电离.假设激光场的频率低于原子$A$的电离势,并与原子$B$的偶极允许跃迁共振。在这种情况下,电离可以通过来自第一原子中心处的激光场的多光子吸收直接发生。或者通过涉及双中心电子-电子关联的间接途径,其中相邻原子$B$首先被光激发,然后在去激发时将其能量无辐射地转移到原子$A$。考虑到单色以及双色激光场,我们研究了各种耦合制度的光电离过程,并确定实验可访问的参数域中的两个中心通道是占主导地位的。

英文摘要:

Photoionization of an atom $A$ by a strong laser field in the presence of a spatially well-separated neighboring atom $B$ is considered. The laser field frequency is assumed to lie below the ionization potential of atom $A$ and be resonant with a dipole-allowed transition in atom $B$. In this situation, the ionization may occur either directly by multiphoton absorption from the laser field at the first atomic center. Or via an indirect pathway involving two-center electron-electron correlations, where the neighbor atom $B$ is first photoexcited and, afterwards, transfers its energy upon deexcitation radiationlessly to atom $A$. Considering monochromatic as well as bichromatic laser fields, we study various coupling regimes of the photoionization process and identify experimentally accessible parameter domains where the two-center channel is dominant.

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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