DSpace Repository

Excitação eletrônica das moléculas de metacrilato de metila e estireno na região do ultravioleta de vácuo

Show simple item record

dc.creator Rocco M. L. M.
dc.creator Souza G. G. B. de
dc.creator Lopes M. C. A.
dc.creator Lucas C. A.
dc.date 1998
dc.date.accessioned 2013-05-30T10:39:09Z
dc.date.available 2013-05-30T10:39:09Z
dc.date.issued 2013-05-30
dc.identifier http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-40421998000100007
dc.identifier http://www.doaj.org/doaj?func=openurl&genre=article&issn=01004042&date=1998&volume=21&issue=1&spage=43
dc.identifier.uri http://koha.mediu.edu.my:8181/jspui/handle/123456789/4117
dc.description Angle-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.
dc.publisher Sociedade Brasileira de Química
dc.source Química Nova
dc.subject methyl methacrylate
dc.subject styrene
dc.subject excitation energy
dc.title Excitação eletrônica das moléculas de metacrilato de metila e estireno na região do ultravioleta de vácuo

Files in this item

Files Size Format View

There are no files associated with this item.

This item appears in the following Collection(s)

Show simple item record

Search DSpace

Advanced Search


My Account