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9 July 2007 Two-photon absorption and laser photochemical decomposition of trans-stilbene substitutes
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The two-photon absorption (TPA) cross section of an ethanol solution of of three molecules (a trans-stilbene and its derivatives) exposed to radiation of the second harmonic of a Nd:YAG laser (532 nm) of nanosecond duration has been determined using the method based on the measurement of the photochemical decomposition of examined molecules, characterized by a low photostability. The quantum yield of the photoreaction (γ266) of dyes under one-photon excitation (4-th harmonic Nd-YAG laser 266 nm) was preliminary determined by absorption method. Then photochemical decomposition of molecules was investigated at two-photon excitation TPA cross-section was determined. At definition of TPA cross-section of molecules, influence transient S1-Sn absorption was taken into account. Comparison of values of TPA cross-section determined in the work, with the experimental and theoretical data received by other authors for these molecules were carried out.
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Valeriy A. Svetlichnyi and Yuriy P. Meshalkin "Two-photon absorption and laser photochemical decomposition of trans-stilbene substitutes", Proc. SPIE 6727, ICONO 2007: Nonlinear Laser Spectroscopy and High-Precision Measurements; and Fundamentals of Laser Chemistry and Biophotonics, 67271E (9 July 2007);

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