The impact of a cluster ion on a solid surface can be described as the simultaneous arrival of many atoms at close distances on the surface, which gives rise to a high energy deposit in a smal lvolume. Among the various subsequent phenomena, kinetic electorn emission can shed some light on the interaction processes invovled. At low velocity (E approx approx 1 eV/amu) electron emission below the kinematic threshold has already been observed as well as thermionic emission from the decay of highly excited reboudnign clusters. At higher velocity (E approx approx keV-MeV/amu) the cooperative effect of the projectile atoms leads to nonlinear electron yields as was first observed with small moleclar ions and more recently with larger clusters.
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机译：簇离子对固体表面的影响可描述为许多原子同时到达表面，这在很小的体积内会产生大量能量。在随后的各种现象中，动力学电子发射可为所涉及的相互作用过程提供一些启示。在低速（E约1 eV / amu）下，已经观察到低于运动学阈值的电子发射，以及高激发的团簇衰变产生的热电子发射。在较高的速度下（E大约为keV-MeV / amu），射弹原子的协同作用导致非线性电子产率，这首先是在小分子摩尔离子中观察到的，最近在较大的团簇中观察到。
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