Electron capture and loss in the scatering of H+ from HOPG graphite

R. A. VIDAL; F. BONETTO; J. FERRÓN; M. A. ROMERO; EVELINA A. GARCÍA; E. C. GOLDBERG

SURFACE SCIENCE

ELSEVIER SCIENCE BV

Año: 2011 vol. 605 p. 18 - 23

0039-6028

In this paper we report measurements of the positive (H+) and negative (H−) ion fractions after H+ scatteringfrom a highly oriented pyrolytic graphite (HOPG) surface. The experimental results show that for a fixed(large) exit angle the negative fraction is almost independent of the primary ion energy, while the positivefraction increases steadily. For a fixed incident energy, the H+ and H− fractions show a complementarybehavior with exit angle. A dynamical quantum mechanical calculation, based on the localized and extendedfeatures of the atom–surface interaction, allows us to understand many of the features of the experimentalresults.