Please use this identifier to cite or link to this item:
https://repositorio.ufba.br/handle/ri/12801
metadata.dc.type: | Artigo de Periódico |
Title: | Site-selective photofragmentation of chlorinated polymeric films observed around the chlorine K-edge |
Other Titles: | Chemical Physics |
Authors: | Arantes, C. Mendes, L. A. V. Pinho, R. R. Ferreira, M. Souza, Gerardo Gerson Bezerra de Rocha, A. B. Rocco, M. L. M. |
metadata.dc.creator: | Arantes, C. Mendes, L. A. V. Pinho, R. R. Ferreira, M. Souza, Gerardo Gerson Bezerra de Rocha, A. B. Rocco, M. L. M. |
Abstract: | Photon stimulated ion desorption (PSID) and Near-edge X-ray absorption fine structure (NEXAFS) studies have been performed on poly(vinyl chloride) (PVC) and poly(vinyl dichloride) (PVDC) around the chlorine 1s-edge. Experiments were performed using a synchrotron source operating in the single-bunch mode and a time-of-flight mass spectrometry for ion analysis. Cl+ ion yields, as a function of the photon energy, reproduce the photoabsorption spectrum, showing significant increase at the 1s-resonance. Edge-jump ratios, defined as the ratio between edge-jumps (intensity ratio of the yields between above and below the absorption edge) of two different transitions, for Cl+ ion yields were much higher than the equivalent electron yields, indicating site-selectivity in C–Cl bond breaking for both polymers, as a result of efficient spectator Auger decay. The expected isotope ratio of 3:1 for chlorine was measured for PVC. The interpretation of the NEXAFS spectrum was assisted by quantum mechanical calculations at a multireference perturbation theory level. |
Keywords: | Fotofragmentação Raios X Cloreto de vinila Vinil dicloreto |
Publisher: | Chemical Physics |
URI: | http://www.repositorio.ufba.br/ri/handle/ri/12801 |
Issue Date: | 2013 |
Appears in Collections: | Artigo Publicado em Periódico (FIS) |
Files in This Item:
File | Description | Size | Format | |
---|---|---|---|---|
7777777777777777.pdf | 394,81 kB | Adobe PDF | View/Open |
Items in DSpace are protected by copyright, with all rights reserved, unless otherwise indicated.