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A time‐of‐flight study of water molecular ion and neutral scattering from copper surfaces
Author(s) -
Xu N. S.,
Pearce C. G.,
Sullivan J. L.
Publication year - 1990
Publication title -
surface and interface analysis
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.52
H-Index - 90
eISSN - 1096-9918
pISSN - 0142-2421
DOI - 10.1002/sia.740160130
Subject(s) - ion , atomic physics , projectile , dissociation (chemistry) , chemistry , scattering , fragmentation (computing) , time of flight , copper , spectral line , molecule , yield (engineering) , materials science , physics , optics , organic chemistry , chromatography , astronomy , computer science , metallurgy , operating system
Collision of water molecule ions with solid surfaces can result in neutralization and fragmentation of the molecule. The energy distribution of total scattered yield was measured with a time‐of‐flight mass spectrometer. The major spectral peak energy is close to the value expected for a binary collision of OH with a copper atom, and the energy distribution can be accounted for by the existing dissociation models. Comparisons are made between the scattering of water molecule ions and that of He + and Ne + ions in terms of the spectral full width at half‐maximum, shape and the scattered yield. It is found that significant water vapour neutral peaks appear in the spectra of scattered Ne. This implies that strong non‐resonance charge exchange mechanisms occur in the projectile beams. The spectral peak heights of the water ion and neutral scattered at different incident angles are compared to those of Ne.