Kinetics of laser-induced phosphorescence of singlet molecular oxygen in aqueous porphyrin solutions

Daria N. Butorina; Alexander A. Krasnovsky Jr.; M. E. Bashtanov; Sergei Yu. Egorov; Alexander V. Priezzhev

doi:10.1117/12.431568

4 May 2001 Kinetics of laser-induced phosphorescence of singlet molecular oxygen in aqueous porphyrin solutions

Daria N. Butorina, Alexander A. Krasnovsky Jr., M. E. Bashtanov, Sergei Yu. Egorov, Alexander V. Priezzhev

Author Affiliations +

Proceedings Volume 4241, Saratov Fall Meeting 2000: Optical Technologies in Biophysics and Medicine II; (2001) https://doi.org/10.1117/12.431568
Event: Saratov Fall Meeting 2000, 2001, Saratov, Russian Federation

Abstract

Kinetics of laser induced phosphorescence of singlet molecular oxygen was measured with nanosecond resolution at 1270 nm in air-saturated aqueous solutions of tetrakis(4- sulfonatophenyl)porphine, tetra sodium salt (TPPS). The phosphorescence kinetic curve comprised the rise and decay phases that are well described by exponentials with the rise time constant, (tau) _r equals 2.16 +/- 0.08 microsecond(s) and decay time constant, (tau) _d equals 3.15 +/- 0.15 microsecond(s) , the rise corresponding to the kinetics of energy transfer from triplet porphyrin to molecular oxygen, the decay - to deactivation of singlet oxygen. Within the accuracy of our measurements both (tau) _r and (tau) _d did not depend on pH in the range 5.8-9, laser powers in the range 0.32-1.6 W/cm², the porphyrin concentrations in the range 13-48 (mu) M and the presence of phosphate buffer saline.

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Daria N. Butorina, Alexander A. Krasnovsky Jr., M. E. Bashtanov, Sergei Yu. Egorov, and Alexander V. Priezzhev "Kinetics of laser-induced phosphorescence of singlet molecular oxygen in aqueous porphyrin solutions", Proc. SPIE 4241, Saratov Fall Meeting 2000: Optical Technologies in Biophysics and Medicine II, (4 May 2001); https://doi.org/10.1117/12.431568

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