caa a22 4500 378927302 CHVBK 20180305123620.0 cr unu---uuuuu 161128e20041101xx s 000 0 eng 10.1524/ract.92.9.705.54971 doi (NATIONALLICENCE)gruyter-10.1524/ract.92.9.705.54971 Luminescence properties of tetravalent uranium in aqueous solution [Elektronische Daten] [Akira Kirishima, Takaumi Kimura, Ryuji Nagaishi, Osamu Tochiyama] The luminescence spectra of U4+ in aqueous solutions were observed in the UV-VIS region at ambient and liquid nitrogen temperatures. The excitation spectrum indicates that the luminescence is arising from the deexcitation of a 5f electron at the 1S0 level and no other emissions of U4+ in aqueous solutions were detected for other f-f transitions. All the luminescence peaks were assigned to the transitions from 1S0 to lower 5f levels. To estimate the luminescence lifetime, luminescence decay curves were measured using time-resolved laser-induced fluorescence spectroscopy. At room temperature, the decay curve indicated that the lifetime was shorter than 20ns. On the other hand, the frozen sample of U4+ in aqueous solution at liquid nitrogen temperature showed the same emission spectrum as at room temperature and its lifetime was 149ns in H2O system and 198ns in D2O system. The longer lifetime at liquid nitrogen temperature made it possible to measure the spectrum of U4+ at the concentration as low as 10-6M. The difference in the anion species (ClO4-, Cl-, SO42-) affected the structure of the emission spectrum to some extent. © 2004 Oldenbourg Wissenschaftsverlag GmbH Laboratory techniques, experiments nationallicence Analytical chemistry nationallicence Inorganic chemistry nationallicence Kirishima Akira aut Kimura Takaumi aut Nagaishi Ryuji aut Tochiyama Osamu aut Radiochimica Acta/International journal for chemical aspects of nuclear science and technology Oldenbourg Wissenschaftsverlag GmbH 92/9-11/2004(2004-11-01), 705-710 0033-8230 92:9-11/2004<705 2004 92 ract https://doi.org/10.1524/ract.92.9.705.54971 text/html Onlinezugriff via DOI 1 research article jats NATIONALLICENCE 856 40 https://doi.org/10.1524/ract.92.9.705.54971 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Kirishima Akira aut NATIONALLICENCE 700 1- Kimura Takaumi aut NATIONALLICENCE 700 1- Nagaishi Ryuji aut NATIONALLICENCE 700 1- Tochiyama Osamu aut NATIONALLICENCE 773 0- Radiochimica Acta/International journal for chemical aspects of nuclear science and technology Oldenbourg Wissenschaftsverlag GmbH 92/9-11/2004(2004-11-01), 705-710 0033-8230 92:9-11/2004<705 2004 92 ract CC0 http://creativecommons.org/publicdomain/zero/1.0 nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-gruyter