Please use this identifier to cite or link to this item:
Type: Artigo de periódico
Title: Aquisição de tempos de vida de fosforescência com resolução de fase e sua aplicação ao estudo de relaxações em polímeros
Title Alternative: Phosphorescence lifetime in polymer relaxation studies: phase resolution method
Author: Talhavini, M.
Atvars, T. D. Z.
Abstract: We describe in this work a simple experimental set up to perform time dependent luminescence experiments in time scales from mili-seconds to seconds, based on the phase resolution of the emission signal. This system is composed by modulation of a continuous light source with an external chopper controlled by a lock-in amplifier. We exemplified the utility of the system in studies of phosphorecence emission using benzophenone dissolved in polystyrene and since the phosphorescence intensity and lifetime are temperature-dependent processes, we also studied polymer relaxation processes in the temperature range from 20 to 400K. A software that drives the spectrofluorimeter and controls both the cryosystem and the lock-in amplifier was developed.
Subject: phase resolution lifetime determinations
polymer relaxation processes
Editor: Sociedade Brasileira de Química
Citation: Química Nova. Sociedade Brasileira de Química, v. 21, n. 3, p. 332-336, 1998.
Rights: aberto
Identifier DOI: 10.1590/S0100-40421998000300015
Date Issue: 1-Jun-1998
Appears in Collections:Unicamp - Artigos e Outros Documentos

Files in This Item:
There are no files associated with this item.

Items in DSpace are protected by copyright, with all rights reserved, unless otherwise indicated.