Deviation from a Poisson Distribution of Proton-Induced Kinetic Electron Emission Statistics from Gold

抄録

Statistics of electron emission from a gold surface under impacts of slow (1–16keV) H⁺ ions are investigated by using a Monte Carlo treatment of ion transport and a semiempirical model of kinetic electron emission. By introduction of Poisson distributed electron excitation and transport, the Monte Carlo calculation is in good agreement with the electron emission statistics observed recently, which deviate from Poisson distributions: the larger probabilities for no electron emission and for emission of 3 or more electrons. Further calculations of electron emission statistics for backscattered ions and trapped ions explain important effects of the backscattering and small-penetration of the ions due to their elastic collisions with gold atoms.