Energy Loss of Low Energy Protons on LiF(100): Surface Excitation and <span class="aps-inline-formula"><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><mrow><msup><mrow><mi>H</mi></mrow><mrow><mo>−</mo></mrow></msup></mrow></math></span> Mediated Electron Emission

P. Roncin; J. Villette; J. P. Atanas; H. Khemliche

doi:10.1103/PhysRevLett.83.864

Energy Loss of Low Energy Protons on LiF(100): Surface Excitation and $H^{-}$ Mediated Electron Emission

P. Roncin, J. Villette, J. P. Atanas, and H. Khemliche

Phys. Rev. Lett. 83, 864 – Published 26 July 1999

Abstract

Impact of 600 eV protons at grazing incidence on LiF(100) is studied with a new coincidence technique combining energy loss and electron spectroscopy. Correlation between the secondary electrons and the charge state of the scattered projectiles demonstrates the role of the $H^{-}$ ions formed on the surface as precursors for electron emission. However, the main channel for energy loss is not associated with electron emission but is interpreted as the population of surface excitons.