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arXiv 0908.2465physics.atom-phphysics.atm-clus
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内阴离子Ne@ C60 ^{z-}中原子光电离的电子关联效应和限制效应

Confinement and electron correlation effects in photoionization of atoms in endohedral anions: Ne@C60^{z-}

V. K. Dolmatov, G. T. Craven, D. Keating

摘要:

本文从理论上研究了富勒烯阴离子A@C60^{z-}中原子A的光电离的共振趋势,并以Ne@C{60}^{z-}中Ne的光电离为例进行了说明。值得注意的是,在中性Ne@C60(I_{nl} ^{z=0})中的Ne的特定nl电离阈值以上,作为一般现象,在任何带电Ne@C60^{z-}中的Ne的相应部分光电离截面sigma_{nl}中的约束共振通过碳笼上的电荷z保持几乎完整。在较低的光子能量ω < I_{nl} ^{z=0}时,相应的光电离截面产生额外的、强的、依赖于z的共振,称为库仑约束共振,作为一般情况。此外,在最内侧的1 s电离阈值附近,发现如此限制的Ne的最外侧2 p子壳层的2 p光电离截面sigma_{2p}通过通道间耦合继承了1 s光电离光谱的限制共振结构。结果,在光电子能量超过2 p阈值约1000 eV时,在受限Ne原子的2 p光电离截面中出现新的限制共振,即,远远高于传统智慧认为它们会存在的地方。因此,作为一个有趣的新的一般现象,禁闭共振复活在光电离光谱的封装原子远高于阈值的一般可能性被揭示。

英文摘要:

Trends in resonances, termed confinement resonances, in photoionization of atoms A in endohedral fullerene anions A@C60^{z-} are theoretically studied and exemplified by the photoionization of Ne in Ne@C{60}^{z-}. Remarkably, above a particular nl ionization threshold of Ne in neutral Ne@C60 (I_{nl}^{z=0}), confinement resonances in corresponding partial photoionization cross sections sigma_{nl} of Ne in any charged Ne@C60^{z-} remain almost intact by a charge z on the carbon cage, as a general phenomenon. At lower photon energies, omega < I_{nl}^{z=0}, the corresponding photoionization cross sections develop additional, strong, z-dependent resonances, termed Coulomb confinement resonances, as a general occurrence. Furthermore, near the innermost 1s ionization threshold, the 2p photoionization cross section sigma_{2p} of the outermost 2p subshell of thus confined Ne is found to inherit the confinement resonance structure of the 1s photoionization spectrum, via interchannel coupling. As a result, new confinement resonances emerge in the 2p photoionization cross section of the confined Ne atom at photoelectron energies which exceed the 2p threshold by about a thousand eV, i.e., far above where conventional wisdom said they would exist. Thus, the general possibility for confinement resonances to resurrect in photoionization spectra of encapsulated atoms far above thresholds is revealed, as an interesting novel general phenomenon.

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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