Europhys. Lett.
Volume 70, Number 6, June 2005
Page(s) 768 - 774
Section Atomic and molecular physics
Published online 11 May 2005
Europhys. Lett., 70 (6), pp. 768-774 (2005)
DOI: 10.1209/epl/i2004-10521-x

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

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

Institut für Allgemeine Physik, TU Wien Wiedner Haupstr. 8, A-1040 Vienna, Austria

received 21 December 2004; accepted in final form 18 April 2005
published online 11 May 2005

Total electron emission yields for impact of $\chem{H^+}$, $\chem{{H_2}^+}$, $\chem{C^+}$, $\chem{N^+}$, $\chem{O^+}$ and $\chem{Ar^+}$ ions (impact energy 2-10$\un{keV}$) 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.

34.50.Dy - Interactions of atoms and molecules with surfaces; photon and electron emission; neutralization of ions.
79.20.Rf - Atomic, molecular, and ion beam impact and interactions with surfaces.

© EDP Sciences 2005