Formic acid is the simplest of the carboxylic acids and a model adsorption system for several surfaces. In spite of the simple structure, formic acid reactivity and photoreactivitymay be quite complex. In this paper, a study is presented on the deuterated formic acid adsorption on Si(111)7× 7 at roomtemperature. The study is performed both by valence band photoemission and by photonstimulated desorption as a function of time and of photon energy in the 90–120 eV range. A primarily adsorption on rest atoms is found. This is verified by monitoring rest atoms and adatom intensity as a function of formic acid exposure. Further checks were made to control that surface adatoms were still free to react after the adsorption of formic acid. The photon stimulated desorption produces 5 single positively charged fragments: D+, O+, OD+ CO+ and CDO+. Possible fragmentation mechanisms are discussed.

Carbone, M. (2015). Adsorption of formic acid on Si(111)7×7 at room temperature: a valence band photoemission and Si2p photodesorption study. SURFACE AND INTERFACE ANALYSIS, 47(2), 216-221 [10.1002/sia.5692].

Adsorption of formic acid on Si(111)7×7 at room temperature: a valence band photoemission and Si2p photodesorption study

CARBONE, MARILENA
2015-01-01

Abstract

Formic acid is the simplest of the carboxylic acids and a model adsorption system for several surfaces. In spite of the simple structure, formic acid reactivity and photoreactivitymay be quite complex. In this paper, a study is presented on the deuterated formic acid adsorption on Si(111)7× 7 at roomtemperature. The study is performed both by valence band photoemission and by photonstimulated desorption as a function of time and of photon energy in the 90–120 eV range. A primarily adsorption on rest atoms is found. This is verified by monitoring rest atoms and adatom intensity as a function of formic acid exposure. Further checks were made to control that surface adatoms were still free to react after the adsorption of formic acid. The photon stimulated desorption produces 5 single positively charged fragments: D+, O+, OD+ CO+ and CDO+. Possible fragmentation mechanisms are discussed.
2015
Pubblicato
Rilevanza internazionale
Articolo
Esperti anonimi
Settore CHIM/03 - CHIMICA GENERALE E INORGANICA
English
Con Impact Factor ISI
surface photochemistry; photoelectron spectroscopy; surface states; photon-stimulated desorption; silicon; formic acid
Carbone, M. (2015). Adsorption of formic acid on Si(111)7×7 at room temperature: a valence band photoemission and Si2p photodesorption study. SURFACE AND INTERFACE ANALYSIS, 47(2), 216-221 [10.1002/sia.5692].
Carbone, M
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/2108/93227
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