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10 April 2007 Photo-induced and thermal processes in fullerene solutions
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The experimental investigations of photo-induced quenching of singlet oxygen luminescence in fullerene solutions (C60 and C70 in CCI4) at optical pumping have shown presence of dependence of 1g&Dgr;g 02 lifetime in a solution on initial fullerene concentration, optical pumping intensity and temperature of the solution. The increase of any of these three factors results in the reduction of the singlet oxygen lifetime in the solution, and for C70 these effects are much stronger than for C60. It is shown that at pulse optical excitation the solution C60 is stable and restores the properties some time after the influence. These effects can not be explained by only thermal mechanism, the major part is played by process of formation of fullerene-oxygen complexes which as a quencher for the state 1Δg 02. These complexes are unstable and are decomposed later into initial components. The initial fullerene C60 concentration is completely restored in the solution. The initial fullerene C70 concentration is partly restored in the solution. All these conclusions are based on the results of the study of absorption spectra of fullerene solutions before and some time after the influence on solutions of pulse optical excitation. For CW irradiation, the effects of photoinduced quenching of singlet oxygen luminescence in fullerene solutions have been studied as well. These phenomena are to be considered when developing a generators of singlet oxygen for fullerene-oxygen-iodine laser. The temperature of solution also plays an important role in the development of singlet oxygen generators. To increase the generator efficiency it is necessary to cool the solution efficiently.
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I. V. Bagrov, I. M. Belousova, O. B. Danilov, V. M. Kiselev, T. D. Murav'eva, and E. N. Sosnov "Photo-induced and thermal processes in fullerene solutions", Proc. SPIE 6613, Laser Optics 2006: Wavefront Transformation and Laser Beam Control, 66130A (10 April 2007);

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