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Nakashima, Nobuaki*; Yatsuhashi, Tomoyuki*; Sakota, Kenji*; Iwakura, Izumi*; Hashimoto, Sena*; Yokoyama, Keiichi; Matsuda, Shohei
Chemical Physics Letters, 752, p.137570_1 - 137570_5, 2020/08
Times Cited Count：1 Percentile：4.85(Chemistry, Physical)Photo-redox reactions between Eu
and Eu
ions are induced by laser irradiation in alcoholic solution. Efficiency, wavelength dependence, and laser-power dependence are investigated with three different lasers. Nano second laser pulses at a wavelength of 308 nm is found to cause one-photon redox reactions with a quantum yield around 0.5. Nano second laser pulses at a wavelength of 394 nm induces two-photon reduction of Eu to form Eu. When the pulse energy is 5 mJ, the quantum yield is measured to be 0.015. Although the quantum yield is one order of magnitude lower than that of the one photon reduction, reduction phenomena can be easily observed under the moderate laser field strength. Because of the two-photon nature, there should be a room to improve the efficiency by increasing the laser field strength.
Nakashima, Nobuaki*; Yokoyama, Keiichi; Yatsuhashi, Tomoyuki*; Sakota, Kenji*; Iwakura, Izumi*
no journal, ,
Studies on photo-reduction of trivalent europium, Eu(III), is revisited by nanosecond lasers at various wavelengths with a Ti:Sapphire, excimer, and dye lasers. We measured the quantum yields, wavelength dependence, and power dependence. As a result, we found that the photo-reduction is induced by a two-photon absorption with a relatively high efficiency as to be observed directly with eyes. Also, the quantum yield of one-photon reduction at 308 nm was determined to be 0.6. These results indicate that highly efficient and selective separation techniques are possible for f-electron elements using multi-photon absorption process induced by laser light.
