NDLI: Excited State Absorption Study in Hematoporphyrin IX

Content Provider	Springer Nature Link
Author	Boni, Leonardo Toro, Carlos Hernandez, Florencio E.
Copyright Year	2009
Abstract	We present the study of the excited state absorption of Hematoporphyrin IX dissolved in dimethyl sulfoxide. All measurements were carried out using open aperture Z-scan and white-light continuum pump-probe with picosecond pulses to avoid triplet excited state absorption. Without the latter contribution, the results obtained with both techniques show a transition to a high singlet excited state. The vibronic progression of the Q-band is observed due to photobleaching of the ground state. In addition, we show that the excited state presents reverse saturable absorption for most of the spectral range studied. A long relaxation component of the first singlet excited state was evidenced with the pump-probe experiment. This result is in agreement with fluorescence lifetime and fluorescence quantum yield measurements. In order to elucidate the origin of the nonlinear effects, we used a three-level energy diagram to describe the principal singlet-singlet transitions.
Starting Page	197
Ending Page	202
Page Count	6
File Format	PDF
ISSN	10530509
Journal	Journal of Fluorescence
Volume Number	20
Issue Number	1
e-ISSN	15734994
Language	English
Publisher	Springer US
Publisher Date	2009-09-16
Publisher Place	Boston
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Excited state absorption Photodynamic therapy Multiphoton absorption Porphyrin Analytical Chemistry Biochemistry Biotechnology Biophysics and Biological Physics Biomedicine general
Content Type	Text
Resource Type	Article
Subject	Sociology and Political Science Spectroscopy Law Biochemistry Clinical Biochemistry Clinical Psychology

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