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Spin polarized metastable helium de-excitation processes on metal surfaces

机译:在金属表面上旋转极化的亚稳态氦气去激励过程

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Spin polarized de-excitation of a metastable helium atom interacting with metal surfaces is treated within density functional theory. The method is based on a self-consistent calculation of the spin dependent electronic properties of the system, such as the surface density of states and the localized surface states, to compute the transition rate. On the high work function Ag(100) and Ag(111) surfaces, the helium 2s electron is delocalized in the metal and hence the transition rate is weakly spin dependent. The existence of a Shockley surface state in Ag(111) determines a neutralization rate that is about 59% larger than that from Ag(100). On a low work function metal, namely Na(100), the rate is of smaller magnitude than those on silver because the 2s triplet resonance is found to be more occupied. Consequently, emitted electrons can display a strong spin dependence also for a paramagnetic surface.
机译:在密度泛函理论中处理了与金属表面相互作用的亚稳态氦原子的自旋极化去激。该方法基于系统的自旋相关电子特性(例如状态的表面密度和局部表面状态)的自洽计算,以计算跃迁速率。在高功函Ag(100)和Ag(111)表面上,氦2s电子在金属中离域,因此过渡速率与自旋有关。 Ag(111)中存在Shockley表面态决定了中和率比Ag(100)中和率大59%。在低功函数金属(即Na(100))上,该速率的幅度小于在银上的速率,因为发现2s三重态共振更易占据。因此,发射的电子对于顺磁性表面也可以表现出强的自旋依赖性。

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