金属表面亚稳分子的俄歇退激
Auger de-excitation of metastable molecules at metallic surfaces
摘要：
本文研究了双原子亚稳分子俄歇退激引起的金属表面次级电子发射。我们的方法是基于一个有效的模型的两个活跃的电子参与的过程-一个分子电子描述的原子轨道的线性组合时，它是绑定和一个双中心库仑波时，它不是和金属电子描述的特征函数的一个步骤电位-并采用Keldysh格林函数。用指数重算法求解延迟格林函数的Dyson方程，我们可以处理时间非局域自能，避免了宽带近似，给出了\NitrogenDominantMetastableState \在铝和钨上的退激结果，并结合以前的实验和理论研究进行了讨论。我们发现钨的实验数据表明，有效的模型捕获的物理过程相当不错的定量协议。对于铝，我们预测的次级电子发射由于俄歇去激发是一个到两个数量级小于共振电荷转移和随后的自动分离。
英文摘要：
We study secondary electron emission from metallic surfaces due to Auger de-excitation of diatomic metastable molecules. Our approach is based on an effective model for the two active electrons involved in the process -- a molecular electron described by a linear combination of atomic orbitals when it is bound and a two-center Coulomb wave when it is not and a metal electron described by the eigenfunctions of a step potential -- and employs Keldysh Green's functions. Solving the Dyson equation for the retarded Green's function by exponential resummation we are able to treat time-nonlocal self-energies and to avoid the wide-band approximation.Results are presented for the de-excitation of \NitrogenDominantMetastableState\ on aluminum and tungsten and discussed in view of previous experimental and theoretical investigations. We find quantitative agreement with experimental data for tungsten indicating that the effective model captures the physics of the process quite well. For aluminum we predict secondary electron emission due to Auger de-excitation to be one to two orders of magnitude smaller than the one found for resonant charge-transfer and subsequent auto-detachment.
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