金属团簇中无辐射电子退激发时间尺度
Nonradiative Electronic Deexcitation Time Scales in Metal Clusters
摘要：
本文研究了中性和带电钠团簇深电子壳层空穴的俄歇电子发射寿命。我们考虑球形团簇，并使用局域密度近似（LDA）计算的能级和波函数计算俄歇跃迁几率。我们得到，俄歇发射过程是积极的不允许中性和带正电的钠簇。一般来说，小Na $_N^-$团簇的俄歇几率与原子团簇的俄歇几率有很大的不同，并表现出丰富的尺寸依赖性。研究的大多数簇大小的俄歇衰变时间的数量级大于原子，可能与典型的碎裂时间。
英文摘要：
The life-times due to Auger-electron emission for a hole on a deep electronic shell of neutral and charged sodium clusters are studied for different sizes. We consider spherical clusters and calculate the Auger-transition probabilities using the energy levels and wave functions calculated in the Local-Density-Approximation (LDA). We obtain that Auger emission processes are energetically not allowed for neutral and positively charged sodium clusters. In general, the Auger probabilities in small Na$_N^-$ clusters are remarkably different from the atomic ones and exhibit a rich size dependence. The Auger decay times of most of the cluster sizes studied are orders of magnitude larger than in atoms and might be comparable with typical fragmentation times.
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