Ion photon-stimulated desorption as a tool to monitor the physisorption to chemisorption transition of benzene on Si(111) 7 7
| Autor: | Marilena Carbone, Maria Novella Piancastelli, L. Hellner, Geneviève Comtet, Roberto Zanoni, Gérald Dujardin, M. J. Besnard-Ramage, M. P. Casaletto |
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| Rok vydání: | 2003 |
| Předmět: |
Settore CHIM/03 - Chimica Generale e Inorganica
Photons Silicon Chemistry Analytical chemistry Chemisorption Benzene Photoionization Atmospheric temperature range Condensed Matter Physics Ion chemistry.chemical_compound Adsorption Physisorption Positive ions Desorption Photodesorption General Materials Science Settore CHIM/02 - Chimica Fisica |
| Zdroj: | Journal of Physics: Condensed Matter. 15:L327-L334 |
| ISSN: | 1361-648X 0953-8984 |
| DOI: | 10.1088/0953-8984/15/21/104 |
| Popis: | We investigated the use of ion photodesorption as a tool to monitor the transition from the physisorbed to the chemisorbed state on a surface. The adsorption of benzene on Si(111) 7 × 7 in the temperature range 40–300 K is chosen as a prototype. The D+ ion photodesorption yield was monitored as a function of temperature at various benzene exposures. Comparative measurements of the C 1s photoelectron yield in the same temperature range enable the physisorbed to chemisorbed state transition to be distinguished from that of the multilayer to the chemisorbed state. We find the onset at 110 K in the first case, and at 130–140 K in the second case. These results demonstrate that ion photodesorption is a potentially interesting method to identify physisorption to chemisorption transitions of adsorbed molecules on surfaces. |
| Databáze: | OpenAIRE |
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