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sio ered are teri ced It is also known that electron emission yield for polycrys-c, developed surface topography, the surface layer struc-ture changes for both the graphitizing materials (polygran-ular graphites, highly-oriented pyrolitic graphite (HOPG)) look the problems of ion-induced electron emission, struc-State University [6]. The 5–35 keV ion beam was produced in an arc source with a longitudinal magnetic field. The ions were separated and the beam was focused by a Sieg-bahn-type magnetic sector field. The angular spread of the ion beam at the focus of the instrument was ±1. The targets were mounted in the collision chamber. The targe