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Master's Dissertation
DOI
https://doi.org/10.11606/D.46.1992.tde-03092010-161222
Document
Author
Full name
Mauro Carlos Costa Ribeiro
E-mail
Institute/School/College
Knowledge Area
Date of Defense
Published
São Paulo, 1992
Supervisor
Committee
Santos, Paulo Sérgio (President)
Bruns, Roy Edward
Ito, Amando Siuiti
Title in Portuguese
Cálculo de perfis de excitação raman pelo método de transformada
Keywords in Portuguese
Espectroscopia
Raman
Ressonante
Abstract in Portuguese
O presente trabalho é um estudo detalhado do cálculo de perfis de excitação Raman pelo método de transformada. A principal característica do método é o emprego do espectro de absorção para gerar diretamente os perfis Raman. Os programas aqui desenvolvidos para microcomputador foram testados pela comparação com perfis conhecidos da literatura, e usados para o estudo teórico de novas possibilidades de modelagem em sistemas conhecidos e também aplicados para novas espécies. Investigamos, a nível teórico , o uso do método de transformada em casos onde ocorre interferência eletrônica, e em perfis de modos não-totalmente simétricos . As novas espécies estudadas pelo método de transformada foram os íons complexos [Zn(dmit)2 ]2- and [Ni(dmit)2]2- , além da espécie TiI4, onde calculamos simultaneamente o perfil da fundamental e de harmônicas, tanto Stokes como anti-Stokes, do modo totalmente simétrico de estiramento Ti - I. Através do ajuste das intensidades relativas dos vários perfis, foi possível obter a variação da distância de equilíbrio Ti - l no estado eletrônico excitado em relação ao fundamental
Title in English
Calculation of raman excitation profile by the transform method
Keywords in English
Raman
Resonance
Spectroscopy
Abstract in English
The present work is a detailed study on the calculation of Raman excitation profiles by the transform method . The main feature of the transform method is to use the absorption spectra to generate the Raman excitation profiles. The computer programs here developed were tested by comparison with known profiles from the literature, and used to explore new possibilities in modelling the Raman profiles of new chemical species, as well as to improve already investigated profiles . We investigated , by use of the transform method, cases where electronic interference must be taken into account, and Raman excitation profiles of non-totally simetric modes [Zn(dmit)2 ]2- and [Ni(dmit)2]2- were now studied for the first time by the transform method. For TiI4 of the resonance profiles for the v1 fundamental and overtones, both Stokes and anti-Stokes, were calculated with a single set of parameters being possible to evaluate the displacement of the Ti - I equilibrium distance in the resonance electronic state relative to the ground state
 
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Publishing Date
2010-09-08
 
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