A model accounting for anomalously high field emission of electrons from diamondlike films in a rough vacuum is suggested. This effect is shown to be associated with a positive ion charge forming on the film. The ions arise because of residual gas ionization in the electrode gap. The pressure maximizing the emission current is determined.
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ACKNOWLEDGMENTS This work was supported by the program “Leading Scientific Schools” (grant no. NSh 9085.2006.2) and program “Quantum Macrophysics” of the President of the Russian Federation (project 2.12).