This article is cited in 2 papers

Biophotonics

Photoinduced breaking of the Fe–O$_{2}$ bond in hemoglobin: dissociation quantum yield, excited electronic states, and nonradiative relaxation processes

B. M. Dzhagarov^a, S. V. Lepeshkevich^a, A. Yu. Panarin^a, M. V. Parkhats^a, A. F. Chaikovskii<sup>b

a</sup> Stepanov Institute of Physics, National Academy of Sciences of Belarus, Minsk, 220072, Belarus
^b Belarussian State University, Minsk, 220030, Belarus

Abstract: Bimolecular recombination of molecular oxygen with human hemoglobin upon excitation in different spectral ranges is studied by nanosecond laser kinetic spectroscopy. The results obtained are fundamentally different; i.e., rather efficient photodissociation takes place in the case of excitation into the $Q$-band of the $\pi\pi$* nature and is practically absent upon excitation into the near-IR band corresponding to the electron transfer from the porphyrin $a_{2u}$ orbital to a mixed orbital formed of the iron $d$ orbital and the free $\pi$ orbital of molecular oxygen. Analysis of these data, together with data obtained previously using the techniques of nano-, pico-, and femtosecond spectroscopy, allowed us to describe the mechanism and dynamics of the photodissociation reaction and intraheme relaxation processes.

Received: 21.02.2018

DOI: 10.21883/OS.2018.07.46277.53-18

 English version: Optics and Spectroscopy, 2018, 125:1, 123–129

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