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Published on: January 8, 2016
Electron stimulated desorption from condensed benzene.
L Álvarez1, A D Bass2, A I Lozano1,3,4
1Fundamental Physics Institute, Consejo Superior de Investigaciones Científicas, Serrano 113-bis, Madrid 28006, Spain. g.garcia@csic.es.
Electron stimulated desorption of benzene thin films reveals electron-induced dissociation mechanisms. Dipolar dissociation is dominant, while secondary electrons from the platinum substrate drive dissociative electron attachment.
Area of Science:
- Surface Science
- Materials Science
- Physical Chemistry
Background:
- Condensed benzene (C6H6) thin films on platinum substrates are studied.
- Electron-induced dissociation is a key process in materials modification and surface chemistry.
Purpose of the Study:
- Investigate electron-induced dissociation of benzene thin films using electron stimulated desorption (ESD).
- Analyze anion and cation desorption yields as a function of electron energy and film thickness.
- Differentiate between dissociative electron attachment (DEA), dipolar dissociation (DD), and dissociative ionization (DI) mechanisms.
Main Methods:
- Electron stimulated desorption (ESD) of anions and cations from benzene thin films.
- Measurement of desorption yields versus incident electron energy (10–950 eV).
- Measurement of desorption yields versus film thickness (0.5–12 ML).
Main Results:
- Dipolar dissociation (DD) is the primary mechanism at probed energies.
- Dissociative electron attachment (DEA) is mainly induced by secondary electrons from the Pt substrate.
- Parent positive ion desorption is significantly suppressed; anion and cation yields show similar energy dependence but differing thickness dependence.
Conclusions:
- Dipolar dissociation is the dominant electron-induced dissociation pathway for condensed benzene.
- Secondary electron effects play a crucial role in DEA.
- Further research is needed to fully elucidate the complex mechanisms governing electron-induced dissociation in condensed matter.
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