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Electron‐stimulated desorption of neutrals from 6063 aluminum—velocity distributions detected by 193 nm non‐resonant laser ionization
Author(s) -
Young C. E.,
Whitten J. E.,
Pellin M. J.,
Gruen D. M.,
Benbow R. L.,
Jones P. L.
Publication year - 1989
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.740141013
Subject(s) - desorption , ionization , chemistry , atomic physics , ion , soft laser desorption , analytical chemistry (journal) , kinetic energy , laser , ionic bonding , atmospheric pressure laser ionization , electron ionization , matrix assisted laser desorption/ionization , optics , physics , adsorption , organic chemistry , chromatography , quantum mechanics
Electron‐stimulated desorption of neutrals from methanol‐dosed 6063 aluminum alloy has been monitored by laser ionization at 193 nm wavelength. Primary electron energies were in the range 1–3 keV. Time‐of‐flight spectra for the neutral desorbate were characterized by a low value of the peak velocity (250 m s −1 ) and a non‐Boltzmann form of the distribution. Neutral desorption was ascribed to the parent methoxy (CH 3 O) species, based on mass spectrometry of the laser‐ionization fragmentation pattern as a function of intensity. Ionic desorption was dominated by H + , which was observed to have kinetic energy peaked at ∼3 eV. Approximate estimates of neutral and ion yields were made, based on ion‐optical modeling of apparatus transmission characteristics.