Investigation of the photobleaching process of eosin Y in aqueous solution by thermal lens spectroscopy.
J Phys Chem B
; 117(6): 1932-7, 2013 Feb 14.
Article
em En
| MEDLINE
| ID: mdl-23374106
ABSTRACT
Eosin Y is known to be a powerful probe of biological molecules and an efficient photosensitizing agent for the production of singlet molecular oxygen. Under continuous laser excitation, degradation through photobleaching is observed in aqueous solutions of eosin Y; this process is driven by the production of singlet oxygen. Optical bleaching in aqueous solutions is known to yield anomalous thermal lens transient signals, which can be evaluated by modeling the relaxation processes that give rise to the generation of heat in the solution. A model describing photobleaching in the thermal lens transient signal is derived and is applied to investigate eosin Y in aqueous solutions at different temperatures. Using this model, quantitative information regarding the molecular diffusion rate, optical bleaching, and fluorescence quantum efficiency is obtained.
Texto completo:
1
Base de dados:
MEDLINE
Assunto principal:
Amarelo de Eosina-(YS)
/
Fotodegradação
Idioma:
En
Revista:
J Phys Chem B
Assunto da revista:
QUIMICA
Ano de publicação:
2013
Tipo de documento:
Article
País de afiliação:
Brasil