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Master's Dissertation
DOI
10.11606/D.76.2002.tde-05052008-170648
Document
Author
Full name
Amilton de Matos Teixeira
E-mail
Institute/School/College
Knowledge Area
Date of Defense
Published
São Carlos, 2002
Supervisor
Committee
Zilio, Sergio Carlos (President)
Gehlen, Marcelo Henrique
Oliveira Junior, Osvaldo Novais de
Title in Portuguese
Propriedades ópticas da tetrapiridilporfirina
Keywords in Portuguese
Espalhamento hiper-rayleigh
Óptica não linear
Porfirina
Abstract in Portuguese
Neste trabalho, estudamos as propriedade ópticas da tetrapiridilporfirina (TPyP), usando clorofórmio como sol vente. Para a caracterização óptica linear foram medidos os espectros de fluorescência e absorbância, tendo este último nos permitido determinar a seção de choque para o estado fundamental com radiação incidente em 532 nm. Usamos a técnica de varredura Z com trem de pulsos (VZTP) para medirmos a absorção não linear da TPyP, em 532 nm, e determinamos, através de um modelo fenomenológico de cinco níveis, vários parâmetros espectroscópicos tais como seções de choques e tempos de vida dos estados. Além disso, com a utilização da técnica de espalhamento hiperRayleigh (HRS) medimos a primeira hiperpolarizabilidade da TPyP, dissolvida em clorofórmio em 1064 nm usando, como material de referência, a p-nitroanilina (PN A), diluída em metanol.
Title in English
Optical properties of tetrapyridil porphyrin
Keywords in English
Hyper-rayleigh scattering
Nonlinear optics
Porphyrin
Abstract in English
This work reports on the optical properties of the tetrakis(pyridil)porphyrin (TPyP). In order to perform the linear optical characterization, fluorescence and absorbance spectra were obtained, where the latter allowed the determination of the cross-section for the ground state with incident radiation at À = 532 nm. We used the Zscan tecnique with pulse trains (ZSPT) to measure the nonlinear absorption of TPyP, at 532 nm, and we managed to determine, through a phenomenological five levels model, several spectroscopic parameters such as cross-sections and lifetime of the states. Moreover, we measured the first hyperpolarizability of TPyP dissolved in chloroform, at À = 1064 nm, using the Hyper-Rayleigh scattering (HRS) technique. The reference material used for HRS measurements was p-nitroaniline (PNA) dissolved in methanol.
 
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Amilton_Texeira_M.pdf (2.32 Mbytes)
Publishing Date
2008-05-06
 
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