Title

Excited State Absorption Study In Hematoporphyrin Ix

Keywords

Excited state absorption; Multiphoton absorption; Photodynamic therapy; Porphyrin

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. © 2009 Springer Science+Business Media, LLC.

Publication Date

1-1-2010

Publication Title

Journal of Fluorescence

Volume

20

Issue

1

Number of Pages

197-202

Document Type

Article

Personal Identifier

scopus

DOI Link

https://doi.org/10.1007/s10895-009-0538-z

Socpus ID

77950985302 (Scopus)

Source API URL

https://api.elsevier.com/content/abstract/scopus_id/77950985302

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