Interatomic Coulombic electron capture in atomic, molecular, and quantum dot systems

Interatomic Coulombic electron capture in atomic, molecular, and quantum dot systems
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原子、分子和量子点系统中的原子间库仑电子捕获

DOI:
10.1051/epjconf/20158407002
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发表时间:
2015
期刊:
影响因子:
--
通讯作者:
L. S. Cederbaum
L. S. Cederbaum
中科院分区:
--
文献类型:
--
作者:
A. Bande;F. M. Pont;K. Gokhberg;L. S. Cederbaum

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原子间库伦电子捕获(ICEC)过程最近在理论上预测了原子和分子簇。对于捕获电子(ε)的原子来说,它与众所周知的光重组竞争,因为在中性或阴离子相邻原子sb的环境中,原子可以在超快的ICEC过程中转移其多余的能量,然后被电离。基于散射理论,我们得到了若干星团的截面fore(ε) +A+B→A−+B++e(ε’)的渐近近似[1,2]。研究发现,在纳米及以下的参与物种间,ICEC开始主导PR。因此,我们认为ICEC过程可能在大气、生物系统、等离子体或纳米结构材料中具有重要意义。作为后者的一个例子,用电子动力学方法研究了半导体双量子点(QDs)[3]模型势中的ICEC。在最简单的情况下,一个量子点捕获一个电子,而另一个量子点发射出一个电子。发现这一过程的反应概率比较大。
The interatomic Coulombic electron capture (ICEC) process has recently been predicted theoretically for clusters of atoms and molecules. For an atomAcapturing an electrone(ε) it competes with the well known photorecombination, because in an environment of neutral or anionic neighboring atomsB,Acan transfer its excess energy in the ultrafast ICEC process toBwhich is then ionized. The cross section fore(ε) +A+B→A−+B++e(ε′) has been obtained in an asymptotic approximation based on scattering theory for several clusters [1,2]. It was found that ICEC starts dominating the PR for distances among participating species of nanometers and lower. Therefore, we believe that the ICEC process might be of importance in the atmosphere, in biological systems, plasmas, or in nanostructured materials. As an example for the latter, ICEC has been investigated by means of electron dynamics in a model potential for semiconductor double quantum dots (QDs) [3]. In the simplest case one QD captures an electron while the outgoing electron is emitted from the other. The reaction probability for this process was found to be relatively large.
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