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Master's Dissertation
DOI
10.11606/D.43.1982.tde-30062015-181653
Document
Author
Full name
Carmen Silvia de Moya Partiti
E-mail
Institute/School/College
Knowledge Area
Date of Defense
Published
São Paulo, 1982
Supervisor
Title in Portuguese
Ressonância paramagnética eletrônica dos radicais livres induzidos por raios X em pireno
Keywords in Portuguese
Ressonância paramagnética eletrônica
Abstract in Portuguese
Cristais únicos de pireno, C16H10, irradiados por raios X, à temperatura ambiente, foram estudados por técnicas de RPE para determinar os radicais livres formados pela radiação. A dependência angular dos espectros de RPE medidos, foi explicada pela presença de dois tipos de radicais, com um hidrogênio adicional: 2-H2 pireno e 3-H2 pireno. Estudamos o decaimento isotérmico do sinal de RPE e foram obtidos dois valores para a energia de ativação: (1,9 ± 0,1) eV e (1,93 ± 0,03) eV.
Title in English
Electron Paramagnetic Resonance of free radicals induced by X-ray in pyrene
Keywords in English
Electron Paramagnetic Resonance
Abstract in English
Single crystals of pirene, C16H10, irradiated with X-rays at room temperature was investigated by EPR to determine the types of stable free radicals formed by the radiation. Angular dependence of the EPR spectra was measured and explained on the basis that 2-H2 pyrene and 3-H2 pyirene were present. The annealing behavior of EPR signal was studied and we obtained two values of activation energy: (1,9 ± 0,1) eV and (1,93 ± 0,03) eV.
 
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Partiti_1982.pdf (2.97 Mbytes)
Publishing Date
2015-07-02
 
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