Article ID Journal Published Year Pages File Type
1192591 International Journal of Mass Spectrometry 2006 7 Pages PDF
Abstract
Electron stimulated desorption (ESD) of fragment anions and thermal desorption spectroscopy (TDS) is applied to study reactions in thin films of a few CF3COOH/CF3COOD monolayers following low energy electron impact (0-20 eV). In ESD, the fragment ions H−/D− and F− are observed via resonant features in the energy range 5-12 eV similar to the dissociative electron attachment (DEA) resonances present in gas phase CF3COOH. Extended electron irradiation of the film at energies above 9 eV generates CO2 and CHF3/CF4 as revealed by a combination of TDS and ESD experiments. The yield for these reactions continuously increases with energy indicating that they are initiated via electronically excited neutrals rather than negative ion resonances. No reactions induced by sub-excitation electrons (≈1 eV) could be observed using the present experimental techniques. In a very recent study on electron attachment to clusters of CF3COOH [J. Langer, I. Martin, G. Karwasz, E. Illenberger, Int. J. Mass Spectrom. Ion Processes 249/250 (2006), 477], the ion-molecule complex CF3COO−·H2O appeared as strongest signal via a resonance located at 0.4 eV.
Related Topics
Physical Sciences and Engineering Chemistry Analytical Chemistry
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