金属表面亚稳氮分子俄歇退激引起的次级电子发射
Secondary electron emission due to Auger de-excitation of metastable nitrogen molecules at metallic surfaces
摘要：
着眼于等离子体壁，我们调查，在一个有效的模型中的两个活跃的电子参与的过程中，次级电子发射由于俄歇去激发的亚稳态氮$N_2(^3σ^+_u)$分子在金属表面。模型绑定和未绑定的分子状态的LCAO方法和两个中心的库仑波，分别和金属状态的阶跃电位的本征函数，我们采用Keldysh格林函数计算的次级电子发射系数$γ_e$保留俄歇自能的非局域性的时间和单粒子量子数的依赖性。对于钨表面的特定情况下，我们发现很好的协议与实验数据表明，相关的俄歇物理是很好地捕捉我们易于使用的模型。
英文摘要：
With an eye on plasma walls we investigate, within an effective model for the two active electrons involved in the process, secondary electron emission due to Auger de-excitation of metastable nitrogen $N_2(^3σ^+_u)$ molecules at metallic surfaces. Modelling bound and unbound molecular states by a LCAO approach and a two-center Coulomb wave, respectively, and the metallic states by the eigenfunctions of a step potential we employ Keldysh Green's functions to calculate the secondary electron emission coefficient $γ_e$ retaining for the Auger self-energy the non-locality in time and the dependence on the single particle quantum numbers. For the particular case of a tungsten surface we find good agreement with experimental data indicating that the relevant Auger physics is well captured by our easy-to-use model.
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