Electron capture and loss in the scattering of oxygen atoms and ions on Mg, Al and Ag surfaces

Electron Capture and Loss Processes in the Interaction of Hydrogen, Oxygen, and Fluorine Atoms and Negative Ions with a MgO(100) Surface

“…The first striking result we wish to underline is the very large ion fraction that is obtained on the oxide surface using incident atoms, indicating that electron capture can occur most efficiently. As a comparison in a similar scattering geometry for H 2 and O 2 scattering on a clean Mg surface, ion fractions of only 1% [8] and 10% [19], respectively, were found for 4 keV in our previous study, while here the corresponding fractions attain 7% and 35%. We do not believe that this large fraction could be due to eventual low contamination by H. Indeed, a strongly polluted surface yielded a lower fraction.…”

Nonadiabatic dynamics in energetic negative fluorine ions scattering from a Si(100) surface

“…13,14,16,[36][37][38] The reduced survival probability for negative ions can be qualitatively attributed to the lower perpendicular velocities of negative ions moving away from the surface. However, the decreased fractions at smaller incident angles (<19 • ) do not agree with the previous results in which the fractions continue to increase.…”

“…5,12 A number of experimental and theoretical studies involving charge transfer processes on metal surfaces have been reported in the past three decades, which mainly study how neutralization and negative-ion formation occur for atom/ion surface collisions. [13][14][15][16][17][18][19][20][21] Numerous studies of keV-energy atoms and ions scattering on metal surfaces reveal that resonance charge transfer between projectile and surface via electron tunneling is the dominant process. [16][17][18][19][22][23][24] Ion surface scattering is the most direct way to probe the charge exchange process.…”

Formation of negative halogen ions in grazing scattering from an Al(111) surface: Multielectron effects

“…Stable negative ions can be formed during scattering or sputtering processes from solids. [14][15][16][17][18][19][20][21][22][23][24][25][26][27][28][29] They can be used as a tool to study local modifications of the surface electronic structure introduced by the adsorbed species. 30,31 In addition, they serve as intermediates in a variety of processes such as quenching of excited states, 32,33 vibrational excitation of adsorbed molecules, 34 reactive scattering, 35 etc.…”