High negative ion yield from light molecule scattering

Molecular oxygen and hydrogen ions were scattered at grazing incidence from several diamond-like carbon (DLC) surfaces in the energy range from 190eV to 2400eV. Most surfaces were hydrogen terminated. For incident positive oxygen ions, scattered negative ion fractions of up to 33% were recorded, and...

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Bibliographic Details
Published in:Nuclear instruments & methods in physics research. Section B, Beam interactions with materials and atoms Beam interactions with materials and atoms, 2005-04, Vol.230 (1-4), p.330-339
Main Authors: Scheer, J.A., Wieser, M., Wurz, P., Bochsler, P., Hertzberg, E., Fuselier, S.A., Koeck, F.A., Nemanich, R.J., Schleberger, M.
Format: Article
Language:English
Subjects:
Diamond like carbon (DLC)
Neutral particle imaging
Particle scattering
Surface ionization
ta-C
Tetrahedral amorphous carbon
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Summary:Molecular oxygen and hydrogen ions were scattered at grazing incidence from several diamond-like carbon (DLC) surfaces in the energy range from 190eV to 2400eV. Most surfaces were hydrogen terminated. For incident positive oxygen ions, scattered negative ion fractions of up to 33% were recorded, and for incident positive hydrogen ions, negative ion fractions of more than 5% were measured. These values are among the highest ever reported, especially for oxygen. They have been matched only by results of scattering experiments using a hydrogen terminated surface of natural diamond.
ISSN:0168-583X
1872-9584
DOI:10.1016/j.nimb.2004.12.063