Full text
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| Author(s): |
Fernanda Rodrigues da Silva
Total Authors: 1
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| Document type: | Doctoral Thesis |
| Press: | São Carlos. |
| Institution: | Universidade de São Paulo (USP). Escola de Engenharia de São Carlos (EESC/SBD) |
| Defense date: | 2007-09-03 |
| Examining board members: |
Otaciro Rangel Nascimento;
Osvaldo Baffa Filho;
Ladislau Martin Neto;
Valentin Obac Roda;
Murilo Araújo Romero
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| Advisor: | Otaciro Rangel Nascimento |
| Abstract | |
The purpose of this project, entitled \"construction of electron paramagnetic resonance spectrometer in S band\", is a construction and characterization of a microwave system for electron paramagnetic resonance spectroscopy in 2-4 GHz, S band. In this work we present the advantages for the construction and characterization of a spectrometer in S band. The advantage of the S band spectrometer is the possibility to study samples which present paramagnetic structures with hyperfine and superhyperfine interactions presenting partial resolution in higher frequency due to the effects known as g-strain and A-strain. For the espectrometer characterization we compare the experimental results obtained in S band with the results obtained in S band. The tests were done consider the microwave power in the sample, the effect of the line width in the signal and the signal-to-noise ratio. The advantages for the construction of a spectrometer in S band are demonstrated with the composition CuTFAs\'O IND.4\' which has a hyperfine interaction badly decided in X band, deriving of the interaction with the proper nucleus of Cu (I=3/2). (AU) | |