Auger-Mediated Sticking of Positrons to Surfaces: Evidence for a Single-Step Transition from a Scattering State to a Surface Image Potential Bound State
Auger-Mediated Sticking of Positrons to Surfaces: Evidence for a Single-Step Transition from a Scattering State to a Surface Image Potential Bound State
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DOI：
10.1103/physrevlett.104.247403
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发表时间：
2010-06-16
影响因子：
8.6
通讯作者：
Weiss, A. H.
中科院分区：
文献类型：
--
作者：
Mukherjee, S.;Nadesalingam, M. P.;Weiss, A. H.
我们提出了一个有效的机制，正电子坚持在这里被称为俄歇介导的坚持表面的观察。在这个过程中，与正电子从非束缚散射态跃迁到束缚像势态相关的能量被耦合到价电子，然后价电子可以具有足够的能量离开表面。令人信服的证据，这一机制被发现在一个狭窄的二次电子峰观察到的入射正电子动能远低于电子功函数。
We present the observation of an efficient mechanism for positron sticking to surfaces termed here Auger-mediated sticking. In this process the energy associated with the positrons transition from an unbound scattering state to a bound image potential state is coupled to a valence electron which can then have sufficient energy to leave the surface. Compelling evidence for this mechanism is found in a narrow secondary electron peak observed at incident positron kinetic energies well below the electron work function.