Deuterated methanol adsorption on Si(111)7 × 7 and Si(100)2 × 1 surfaces has been investigated, at room temperature, by synchrotron radiation photoemission and photostimulated desorption. Photoemission experiments as a function of methanol coverage show that deuterated methanol adsorption is dissociative on both surfaces and occurs via σO-D bond breakage and σSi-O bond formation. Site selectivity is displayed by the methoxy species on Si(111)7 × 7 surface, since the S2 surface state related to the rest atoms is quickly quenched upon low coverage adsorption. The S1 surface state is quenched only subsequently at much higher coverages. The photostimulated desorption pattern is similar for the two surfaces and strongly depends on the investigated energy range. D+ is always the most abundant ion produced, but higher mass fragments are present too in the energy range including the C Is threshold, where multiple desorption processes are possibly taking place.

Carbone, M., Zanoni, R., Piancastelli, M., Comtet, G., Dujardin, G., Hellner, L. (1996). Synchrotron radiation photoemission and photostimulated desorption of deuterated methanol on Si(111)7 × 7 and Si(100)2 × 1. SURFACE SCIENCE, 352-354, 391-395 [10.1016/0039-6028(95)01167-6].

Synchrotron radiation photoemission and photostimulated desorption of deuterated methanol on Si(111)7 × 7 and Si(100)2 × 1

CARBONE, MARILENA;
1996-01-01

Abstract

Deuterated methanol adsorption on Si(111)7 × 7 and Si(100)2 × 1 surfaces has been investigated, at room temperature, by synchrotron radiation photoemission and photostimulated desorption. Photoemission experiments as a function of methanol coverage show that deuterated methanol adsorption is dissociative on both surfaces and occurs via σO-D bond breakage and σSi-O bond formation. Site selectivity is displayed by the methoxy species on Si(111)7 × 7 surface, since the S2 surface state related to the rest atoms is quickly quenched upon low coverage adsorption. The S1 surface state is quenched only subsequently at much higher coverages. The photostimulated desorption pattern is similar for the two surfaces and strongly depends on the investigated energy range. D+ is always the most abundant ion produced, but higher mass fragments are present too in the energy range including the C Is threshold, where multiple desorption processes are possibly taking place.
Pubblicato
Rilevanza internazionale
Articolo
Sì, ma tipo non specificato
Settore CHIM/03 - Chimica Generale e Inorganica
Settore CHIM/02 - Chimica Fisica
English
Con Impact Factor ISI
Alcohols; Photon stimulated desorption (PSD); Semiconducting surfaces; Single crystal surfaces; Soft X-ray photoelectron spectroscopy; Surface chemical reaction
Carbone, M., Zanoni, R., Piancastelli, M., Comtet, G., Dujardin, G., Hellner, L. (1996). Synchrotron radiation photoemission and photostimulated desorption of deuterated methanol on Si(111)7 × 7 and Si(100)2 × 1. SURFACE SCIENCE, 352-354, 391-395 [10.1016/0039-6028(95)01167-6].
Carbone, M; Zanoni, R; Piancastelli, M; Comtet, G; Dujardin, G; Hellner, L
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/2108/42667
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