Strong negative-electron-affinity effects have been observed on the surface of as-grown chemical-vapor-deposited diamond using secondary-electron emission. The samples were randomly oriented polycrystalline diamond films terminated with hydrogen. The effect appears as an intensive peak in the low-energy part of the spectrum of the electron energy distribution and may be described in the model of effective negative electron affinity.
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Krainsky et al. (1996) studied this question.
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