Abstract

Abstract The angular and energy resolved electron spectral data is presented. The spectra have two kinds of peak: a high energy peak (HEP) being nearly independent of the beam deflection angle, and a low energy peak (LEP) shifting towards lower energy with the angle. The HEP is explained by an emission mechanism that field-induced hot electrons are coherently scattered from the metal islands presented in the insulator, and it is inferred that the LEP electrons may be generated by the ionizing collision possibly caused in the insulator.

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