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

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.

Citation Download Citation

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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