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|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|
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|
|Appears in Collections:||Unicamp - Artigos e Outros Documentos|
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