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Excitação eletrônica das moléculas de metacrilato de metila.pdf81.81 kBAdobe PDFThumbnail
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dc.creatorRocco, M. L. M.-
dc.creatorSouza, G. G. B. de-
dc.creatorLopes, Maria Cristina Andreolli-
dc.creatorLucas, C. A.-
dc.description.abstractAngle-resolved electron energy-loss spectra have been measured for the methyl methacrylate (MMA) and styrene molecules in the 0 - 50 eV energy range. The spectra have been obtained at 1 keV incident energy, with an energy resolution of 0.8 eV and covering an angular range of 2.0 to 7.0 degrees. Within our knowledge, this is the first gas-phase excitation spectrum for MMA and styrene in this energy range. The spectra of MMA at small scattering angles are dominated by an intense peak at 6.7 eV followed by a broad band centered at about 16 eV. In the case of styrene, six bands can be observed in the spectra. Based on the angular behaviour of the excitation spectra of these molecules, the low-lying peaks observed are considered to be associated predominantly with dipole-allowed processes. In both cases, new bands can be observed for excitation energies greater than 20 eV. This could be associated with dipole-forbidden transitions to shake-up and doubly-excited states.pt_BR
dc.relation.ispartofQuímica Novapt_BR
dc.rightsAcesso Abertopt_BR
dc.subjectMethyl methacrylatept_BR
dc.subjectExcitation energypt_BR
dc.titleExcitação eletrônica das moléculas de metacrilato de metila e estireno na região do ultravioleta de vácuopt_BR
dc.title.alternativeElectronic excitation of the methyl methacrylate and styrene molecules in the vuv rangept_BR
dc.typeArtigo de Periódicopt_BR
Appears in Collections:Artigos de Periódicos

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