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Ion-induced kinetic electron emission from HOPG with different surface orientation

S. Cernusca, M. Fürsatz, HP. Winter and F. Aumayr

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Total electron emission yields for impact of H+, H2+, C+, N+, O+ and Ar+ ions (impact energy 2–10 keV) on clean highly oriented pyrolytic graphite (HOPG) have been measured. An enhancement in the electron yield of more than a factor of 2 is found when comparing results for differently oriented HOPG surfaces (orientation of the graphite layers with respect to the surface). By analyzing these data we elucidate the influence of electron transport on kinetic electron emission and derive direction-dependent mean escape depths for low-energy electrons.


PACS

34.35.+a Interactions of atoms and molecules with surfaces

79.20.Rf Atomic, molecular, and ion beam impact and interactions with surfaces

Subjects

Atomic and molecular physics

Condensed matter: electrical, magnetic and optical

Surfaces, interfaces and thin films

Dates

Issue 6 (June 2005)

Received 21 December 2004, accepted for publication 18 April 2005, in final form 18 April 2005

Published 11 May 2005



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