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arXiv 1603.01432physics.atom-ph
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Si负离子的内壳层光剥离:多电子关联的强效应

Inner-shell photodetachment from Si- negative ion: strong effect of many-electron correlations

Galina Schrange-Kashenock

摘要:

本文首次对硅负离子的内壳层单次光剥离进行了理论研究。在多体理论的框架下,计算了在实验可及的光子能量范围内(7.5-14 Ry),硅离子L壳层光剥离的部分和总截面、光电子相移和角各向异性参数。比较之间的计算的离子多电子系统Si-电磁场的响应在不同水平的近似:“冻结场”随机相位近似与交换(RPAE),和静态弛豫近似。当动态弛豫和极化包括在戴森方程方法(DEM)与RPAE校正(RPAE&DEM方法)同时进行时,进行了最佳分析。据预测,光激发到开放p壳层中复杂的“形状-Feschbach”性质的共振态,在2s和2 p内壳层阈值的能量范围内,其本身显示为光剥离截面中的突出共振结构,类似于来自C-的1 s内壳层光剥离中的共振结构(J.Phys.B 39,1379,2006)。的光剥离动力学特性清楚地表明,所有考虑的多电子相关的RPAE和DEM的方法内的意义,但总的光剥离截面是由一个强共振峰后的2s阈值占主导地位。动态松弛(屏蔽)被确定为形成这种共振的决定性因素。

英文摘要:

The first theoretical investigation on the inner-shell single-photodetachment from the Si- negative ion is presented. The partial and total cross sections, the photoelectron phaseshifts, and the parameters of angular anisotropy are calculated in the framework of Many-Body Theory for L-shell photodetachment from Si- ion in the experimentally accessible range of photon energies (7.5-14 Ry). Comparison is made between the calculations of the response of the ionic many-electron system Si- to an electromagnetic field at the different levels of approximation: the "frozen-field" Random Phase Approximation with Exchange (RPAE), and the static relaxation approximation. The optimal analysis is made when the dynamic relaxation and polarization are included within the Dyson Equation Method (DEM) simultaneously with the RPAE corrections (RPAE&DEM approach). It is predicted that the photoexcitation to a resonance state of complex "shape-Feschbach" nature in the open p-shell reveals itself as a prominent resonance structure in the photodetachment cross sections in the energy range of the 2s and 2p inner shell thresholds similar to that in 1s inner-shell photodetachment from C- (J.Phys.B 39, 1379, 2006). The photodetachment dynamical characteristics clearly demonstrate the significance of all the considered many-electron correlations within the RPAE&DEM approach, however the total photodetachment cross section is dominated by a strong resonance peak just after the 2s threshold. Dynamical relaxation (screening) is identified as a decisive factor in the formation of this resonance.

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