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Abstract: | Two-photon absorption in methanol solutions of Rhodamine 6G is investigated by photoacoustics using the second harmonic of a pulsed Nd:YAG laser. Competition between one-photon and two-photon processes is observed, depending critically on the sample concentration and input light flux. |
URI: | http://dyuthi.cusat.ac.in/purl/2438 |
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Dyuthi-P0299.pdf | (349.4Kb) |
Abstract: | Experimental method for measuring photoacoustic(PA) signals generated by a pulsed laser beam in liquids is described. The pulsed PA technique is found to be a convenient and accurate method for determination of quantum yield in fluorescent dye solutions. Concentration dependence of quantum yield of rhodamine 6G in water is studied using the above method. The results indicate that the quantum yield decreases with increase in concentration in the quenching region in agreement with the existing reports based on radiometric measurements. |
URI: | http://dyuthi.cusat.ac.in/purl/2499 |
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Dyuthi-P0290.pdf | (511.1Kb) |
Abstract: | Two-photon absorption in Rhodamine 6G using the second harmonic of a pulsed Q-switched Nd:YAG laser has been studied by photoacoustic technique. It is observed that there is a competition between one-photon and two-photon absorption processes. At lower concentration the two-photon process is predominant over the one-photon process. |
URI: | http://dyuthi.cusat.ac.in/purl/2493 |
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Dyuthi-P0291.pdf | (252.6Kb) |
Abstract: | S1 to S3 excited singlet state absorption and two-photon absorption in Rhodamine 6G at the pump wavelengths of 532 and 1064 nm respectively are investigated. The advantages of employing the pulsed photoacoustic technique for conveniently observing excited singlet state absorption are discussed. It is shown that, since photoacoustics and fluorescence are complementary phenomena, analysis using both techniques will yield a better understanding of optical processes in molecules like Rhodamine 6G. |
URI: | http://dyuthi.cusat.ac.in/purl/2445 |
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Dyuthi-P0306.pdf | (315.7Kb) |
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