Transient Absorption of Organic Molecules under High-Power Laser Excitation
V. A. Svetlichnyi, T. N. Kopylova, G. V. Mayer, I. N. Lapin
Российский физический журнал
https://doi.org/10.1007/s11182-006-0002-3
In the present work, results of investigations into the transient absorption of some organic compounds by the method of pulsed flash photolysis are given. Experimental investigations were carried out using an original setup of pulsed flash photolysis with an exciting pulse of XeCl-laser radiation of nanosecond duration and sensing by broadband laser-transient fluorescent radiation of a mixture of organic fluorophors called “white light” excited by the same source in the wavelength range 330–750 nm. The setup registers the short-living (singlet-singlet) and long-living (triplet-triplet) absorptions. The transient absorption spectra of already investigated para-terphenyl, naphthalene, and 1-phenyl-2(2-naphthyl)-ethylene molecules are presented; the spectra of the transient absorption and its nature are in good agreement with the experimental and calculated data published in the literature. We first investigated the transient absorption of LOC1 (S1-Sn at 580 nm and T1-Tn at 500 nm) and phenalemine 512 (S1-Sn at 395 nm). It is demonstrated that the experimentally observed induced absorption of phenalemine 512 and PD 789 is the S1-Sn absorption, which is in good agreement with the results of quantum-chemical calculations.
- V. D. Kuznetsov Siberian Physical-Technical Institute, RussiaV. A. Svetlichnyi, T. N. Kopylova, G. V. Mayer & I. N. Lapin
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