9 documents found, page 1 of 1
Excitation and Ionic Fragmentation of Gas-Phase Biomolecules using Electrons an...
Souza, Gerardo Gerson Bezerra de; Coutinho, Lúcia H.; Nunez, Cecilia Veronica; Bernini, Rafael B.; Castilho, Roberto B. de; Lago, Alexsande F.
Ionic fragmentation of the isoprene molecule in the VUV energy range (12 to 310...
Bernini, Rafael Berrelho; Coutinho, Lúcia H.; Nunez, C. V.; Castilho, R. B. de; Souza, Gerardo Gerson Bezerra deIsoprene, C5H8, is a biogenic volatile compound emitted from plants and animals, playing an important role in atmospheric chemistry. In this work, we have studied the ionic fragmentation of the isoprene molecule induced by high energy photons (synchrotron radiation), both at the valence (12.0, 14.0, 16.0, 18.0, and 21.0 eV) and carbon 1s edge (270 and 310 eV, respectively, below and above edge) energies. The io...
Elemental concentration and sulfur chemical speciation in the amazonian plant a...
Gonzalez, Joselaine C.; Simões, Grazieli; Bernini, Rafael Berrelho; Coutinho, Lúcia H.; Stedile, Fernanda Chiarello; Nunez, C. V.The inorganic composition of the bark and leaf of a plant from the Amazon rainforest, Andira surinamensis, was determined using two non-destructive, multi-element techniques: X-ray fluorescence (XRF) and Rutherford backscattering spectrometry (RBS). XRF measurements were made using both a conventional X-ray source and synchrotron radiation. It was observed that although magnesium, aluminum, silicon, phosphorus,...
Irradiação de polímeros com feixe de elétrons: caracterização de íons positivos...
Rocco, Maria Luiza Miranda; Pontes, Frederico Celestino; Faraudo, Gustavo Sebastian; Souza, Gerardo Gerson Bezerra de; Weibel, Daniel Eduardo Weibel-; With the aim of studying the interaction of fast electrons with solid surfaces we have developed an experimental set-up based on electron stimulated desorption (ESD) coupled to time-of-flight (TOF) mass spectrometry. Poly(methyl methacrylate) and poly(vynil chloride) samples have been irradiated by a pulsed electron beam of 1.2 keV and 0.18 µs FWHM. The results show that H+ is the main ionic species to desor...
Ionic Fragmentation of Methyl Methacrylate Induced by Synchrotron Radiation and...
Quintella, Cristina Maria Assis Lopes Tavares da Mata Hermida; Souza, Gerardo Gerson Bezerra de; Maciel, Joselito B.p. 521-524; Submitted by Santiago Fabio (fabio.ssantiago@hotmail.com) on 2013-08-19T18:14:04Z No. of bitstreams: 1 33333333333333.pdf: 76117 bytes, checksum: ff30c7fcee9cad48c352b6f48508deff (MD5); Made available in DSpace on 2013-08-19T18:14:04Z (GMT). No. of bitstreams: 1 33333333333333.pdf: 76117 bytes, checksum: ff30c7fcee9cad48c352b6f48508deff (MD5) Previous issue date: 1998; Ionic fragmentation of methylm...
Site-selective photofragmentation of chlorinated polymeric films observed aroun...
Arantes, C.; Mendes, L. A. V.; Pinho, R. R.; Ferreira, M.; Souza, Gerardo Gerson Bezerra de; Rocha, A. B.; Rocco, M. L. M.; Arantes, C.Texto completo. Acesso restrito. p. 145–149; Submitted by Santiago Fabio (fabio.ssantiago@hotmail.com) on 2013-06-25T17:17:04Z No. of bitstreams: 1 7777777777777777.pdf: 404289 bytes, checksum: 4ce753d009c9fcad428f2e646e1f2de2 (MD5); Rejected by Alda Lima da Silva(sivalda@ufba.br), reason: Material de Física on 2013-08-16T19:00:40Z (GMT); Submitted by Santiago Fabio (fabio.ssantiago@hotmail.com) on 2013-08-19T1...
Photostability of gas- and solid-phase biomolecules within dense molecular clou...
Cavasso Filho, Reinaldo Luiz; Oliveira, Sergio Pilling Guapyassu de; Andrade, Diana Paula de Pinho; Nascimento, E. M.texto completo: acesso restrito. p.2214–2222.; Submitted by Ana Valéria de Jesus Moura (anavaleria_131@hotmail.com) on 2012-03-05T18:50:02Z No. of bitstreams: 1 j.1365-2966.2010.17840.x.pdf: 10460906 bytes, checksum: 2aeb40d6e0ab161ff9e926bb08e9c9c5 (MD5); Made available in DSpace on 2012-03-05T18:50:02Z (GMT). No. of bitstreams: 1 j.1365-2966.2010.17840.x.pdf: 10460906 bytes, checksum: 2aeb40d6e0ab161ff9e926bb...
Photostability of gas- and solid-phase biomolecules under astrophysical analog ...
Marinho, Ricardo dos Reis Teixeira; Oliveira, Sergio Pilling Guapyassu de; Oliveira, Diana Paula Andrade Pilling Guapyassú dep. 440-441; Submitted by Ana Valéria de Jesus Moura (anavaleria_131@hotmail.com) on 2012-01-02T12:34:19Z No. of bitstreams: 1 download.pdf: 153630 bytes, checksum: 17700feab984d7336a3879fb2c728861 (MD5); Made available in DSpace on 2012-01-02T12:34:19Z (GMT). No. of bitstreams: 1 download.pdf: 153630 bytes, checksum: 17700feab984d7336a3879fb2c728861 (MD5) Previous issue date: 2009; We present experimental studi...
Um espectômetro de massas de tempo-de-vôo para o estudo da ionização de amostra...
Cardoso, Aldo S.; Pontes, Frederico C.; Souza, Gerardo Gerson Bezerra de; Mundim, Maria Suely Pedrosa; Cardoso, Aldo S.; Pontes, Frederico C.p. 315-319,May/June.; Submitted by JURANDI DE SOUZA SILVA (jssufba@hotmail.com) on 2011-12-19T11:03:44Z No. of bitstreams: 1 a06v24n3.pdf: 73582 bytes, checksum: bdd74b4dba961d1d39af298ebbd955e9 (MD5); Made available in DSpace on 2011-12-19T11:03:44Z (GMT). No. of bitstreams: 1 a06v24n3.pdf: 73582 bytes, checksum: bdd74b4dba961d1d39af298ebbd955e9 (MD5) Previous issue date: 2001; A TIME-OF-FLIGHT MASS SPECTROMET...