Ionic fragmentation mechanisms of 2,2,2-trifluoroethanol following excitation with synchrotron radiation
Gaseous 2,2,2-trifluoroethanol (TFE) is excited with synchrotron radiation between 10 and 1000 eV and the ejected electrons and positive ions are detected in coincidence. In the valence-electron energy region, the most abundant species is CH2OH+. Other fragments, including ions produced by atomic re...
| Autores: | , , , , , , |
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| Tipo de recurso: | artículo |
| Estado: | Versión publicada |
| Fecha de publicación: | 2015 |
| País: | Argentina |
| Institución: | Consejo Nacional de Investigaciones Científicas y Técnicas |
| Repositorio: | CONICET Digital (CONICET) |
| Idioma: | inglés |
| OAI Identifier: | oai:ri.conicet.gov.ar:11336/39797 |
| Acceso en línea: | http://hdl.handle.net/11336/39797 |
| Access Level: | acceso abierto |
| Palabra clave: | Gas-Phase Reactions Ionization Potentials Photochemistry Radicals Valence Isomerization https://purl.org/becyt/ford/1.4 https://purl.org/becyt/ford/1 |
| Sumario: | Gaseous 2,2,2-trifluoroethanol (TFE) is excited with synchrotron radiation between 10 and 1000 eV and the ejected electrons and positive ions are detected in coincidence. In the valence-electron energy region, the most abundant species is CH2OH+. Other fragments, including ions produced by atomic rearrangements, are also detected; the most abundant are COH+, CFH2 + and CF2H2 +. The energies of electronic transitions from C 1s, O 1s and F 1s orbitals to vacant molecular orbitals are determined. A site-specific C 1s excitation is observed. The photofragmentation mechanisms after the excitation of core-shell electrons are inferred from analysis of the shape and slope of the coincidence between two charged fragments in the bi-dimensional coincidence spectra. The spectra are dominated by islands that correspond to the coincidence of H+ with several charged fragments. One of the most important channels leads to the formation of CH2OH+ and CF3 + in a concerted mechanism. |
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