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arXiv 1601.00869physics.atom-ph
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氙原子从线性到非线性的集体共振

Collective resonances of atomic xenon from the linear to the nonlinear regime

Yi-Jen Chen, Stefan Pabst, Robin Santra

摘要:

XUV非线性光谱学最近发现,在原子核巨偶极共振(GDR)能量范围内存在不止一个集体偶极共振态态。这种共振态的子结构,隐藏在线性制度,提出了迫在眉睫的问题,我们的集体电子行为的理解,这在很大程度上是建立在线性光谱研究。在这里,我们从一个新的角度来探讨集体响应的量子化学:我们直接研究共振本征态,然后分析它们的光谱表现。我们发现,线性光谱捕获的共振子结构作为量子干涉的结果,只有部分信息。此外,我们表明,共振态占主导地位的GDR在线性光谱没有绝热连接的共振态管理相应的截面时,忽略多电子相互作用。超越偶极允许的相关电子结构,我们预测的集体多极共振的存在。与原子中任何已知的集体特征不同,这些共振的寿命非常长(超过100阿秒),从而为使用先进光源研究原子的集体非线性响应提供了一个新的场所。

英文摘要:

XUV nonlinear spectroscopy has recently discovered that there is more than one collective dipole resonance state in the energy range of the giant dipole resonance (GDR) of atomic Xe. This resonance-state substructure, hidden in the linear regime, raises imminent questions regarding our understanding of the collective electronic behavior of Xe, which has been largely founded on linear spectroscopic studies. Here, we approach the collective response of Xe from a new perspective: we study directly the resonance eigenstates, and then analyze their spectroscopic manifestations. We find that linear spectroscopy captures only partial information on the resonance substructure as a result of quantum interferences. Moreover, we show that the resonance state dominating the GDR in linear spectroscopy has no adiabatic connection to the resonance state governing the corresponding cross section when multielectron interactions are neglected. Going beyond the dipole-allowed correlated electronic structure, we predict the existence of collective multipole resonances of Xe. Unlike any known collective feature in atoms, these resonances live exceptionally long (more than 100 attoseconds), thus providing a new playground for studying the collective nonlinear response of Xe using advanced light sources.

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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