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Chiera, N. M.*; Sato, Tetsuya; Eichler, R.*; Tomitsuka, Tomohiro; Asai, Masato; Adachi, Sadia*; Dressler, R.*; Hirose, Kentaro; Inoue, Hiroki*; Ito, Yuta; et al.
Angewandte Chemie; International Edition, 60(33), p.17871 - 17874, 2021/08
Times Cited Count：2 Percentile：14.88(Chemistry, Multidisciplinary)The formation and the chemical characterization of single atoms of dubnium (Db, element 105), in the form of its volatile oxychloride, was investigated using the on-line gas phase chromatography technique, in the temperature range 350 - 600 
C. Under the exact same chemical conditions, comparative studies with the lighter homologs of group-5 in the Periodic Table clearly indicate the volatility sequence being NbOCl
TaOCl
DbOCl. From the obtained experimental results, thermochemical data for DbOCl were derived. The present study delivers reliable experimental information for theoretical calculations on the chemical properties of transactinides.
Chiera, N. M.; Sato, Tetsuya; Tomitsuka, Tomohiro; Asai, Masato; Ito, Yuta; Shirai, Kaori*; Suzuki, Hayato; Tokoi, Katsuyuki; Toyoshima, Atsushi; Tsukada, Kazuaki; et al.
Journal of Radioanalytical and Nuclear Chemistry, 320(3), p.633 - 642, 2019/06
Times Cited Count：1 Percentile：11.15(Chemistry, Analytical)An isothermal gas-chromatographic (IGC) device has been developed and tested for on-line gas phase studies of volatile oxychlorides of short-lived group-5 transition metals. Radioisotopes of niobium and tantalum, produced in nuclear fusion evaporation reactions, are directly flushed into the IGC setup by an inert gas-jet. Oxychloride compounds are formed by the addition of SOCl
and O. Parameters influencing the formation and transport of NbOCl and TaOCl are investigated. For nuclides with half-lives (
) of about 30 s, an overall efficiency of 7% is obtained, rendering the IGC setup suitable for the chemical exploration of 
Db( = 34s).
Yoshida, Yukari*; Suzuki, Yoshiyuki*; Al-Jahdari, W. S.*; Hamada, Nobuyuki*; Funayama, Tomoo; Shirai, Katsuyuki*; Kato, Hiroyuki*; Sakashita, Tetsuya; Kobayashi, Yasuhiko; Nakano, Takashi*
Journal of Radiation Research, 53(1), p.87 - 92, 2012/02
Times Cited Count：8 Percentile：41.9(Biology)Kaminuma, Takuya*; Suzuki, Yoshiyuki*; Shirai, Katsuyuki*; Mizui, Toshiyuki*; Noda, Shinei*; Yoshida, Yukari*; Funayama, Tomoo; Takahashi, Takeo*; Kobayashi, Yasuhiko; Shirao, Tomoaki*; et al.
Journal of Radiation Research, 51(6), p.627 - 631, 2010/11
Times Cited Count：9 Percentile：33.86(Biology)Suzuki, Yoshiyuki*; Yoshida, Yukari*; Shirai, Katsuyuki*; Hamada, Nobuyuki*; Mizui, Toshiyuki*; Noda, Shinei*; Funayama, Tomoo; Sakashita, Tetsuya; Kobayashi, Yasuhiko; Shirao, Tomoaki*; et al.
JAEA-Review 2006-042, JAEA Takasaki Annual Report 2005, P. 107, 2007/02
Yoshida, Yukari*; Suzuki, Yoshiyuki*; Hamada, Nobuyuki*; Shirai, Katsuyuki*; Noda, Shinei*; Al-Jahdari, W. S.*; Funayama, Tomoo; Sakashita, Tetsuya; Wada, Seiichi*; Kobayashi, Yasuhiko; et al.
no journal, ,
no abstracts in English
Suzuki, Yoshiyuki*; Shirai, Katsuyuki*; Yoshida, Yukari*; Mizui, Toshiyuki*; Kiyohara, Hiroki*; Noda, Shinei*; Ishizaki, Yasuki*; Ozawa, Seiji*; Nakano, Takashi*; Hamada, Nobuyuki*; et al.
no journal, ,
no abstracts in English
Suzuki, Yoshiyuki*; Shirai, Katsuyuki*; Mizui, Toshiyuki*; Hamada, Nobuyuki*; Noda, Shinei*; Funayama, Tomoo; Yoshida, Yukari*; Kobayashi, Yasuhiko; Shirao, Tomoaki*; Nakano, Takashi*
no journal, ,
no abstracts in English
Yoshida, Yukari*; Suzuki, Yoshiyuki*; Hamada, Nobuyuki*; Shirai, Katsuyuki*; Al-Jahdari, W. S.*; Kobayashi, Yasuhiko; Ozawa, Seiji*; Nakano, Takashi*
no journal, ,
no abstracts in English
Yoshida, Yukari*; Suzuki, Yoshiyuki*; Takeuchi, Aiko*; Hamada, Nobuyuki*; Shirai, Katsuyuki*; Funayama, Tomoo; Sakashita, Tetsuya; Kobayashi, Yasuhiko; Ozawa, Seiji*; Nakano, Takashi*
no journal, ,
no abstracts in English
Suzuki, Yoshiyuki*; Shirai, Katsuyuki*; Mizui, Toshiyuki*; Hamada, Nobuyuki*; Noda, Shinei*; Funayama, Tomoo; Yoshida, Yukari*; Kobayashi, Yasuhiko; Shirao, Tomoaki*; Nakano, Takashi*
no journal, ,
no abstracts in English
Al-Jahdari, W. S.*; Suzuki, Yoshiyuki*; Yoshida, Yukari*; Hamada, Nobuyuki*; Noda, Shinei*; Shirai, Katsuyuki*; Funayama, Tomoo; Sakashita, Tetsuya; Sakurai, Hideyuki*; Kobayashi, Yasuhiko; et al.
no journal, ,
Shirai, Katsuyuki*; Suzuki, Yoshiyuki*; Mizui, Toshiyuki*; Hamada, Nobuyuki*; Noda, Shinei*; Funayama, Tomoo; Yoshida, Yukari*; Kobayashi, Yasuhiko; Shirao, Tomoaki*; Nakano, Takashi*
no journal, ,
no abstracts in English
Yoshida, Yukari*; Suzuki, Yoshiyuki*; Hamada, Nobuyuki*; Shirai, Katsuyuki*; Al-Jahdari, W. S.*; Funayama, Tomoo; Sakashita, Tetsuya; Kobayashi, Yasuhiko; Ozawa, Seiji*; Nakano, Takashi*
no journal, ,
no abstracts in English
Al-Jahdari, W. S.*; Suzuki, Yoshiyuki*; Yoshida, Yukari*; Hamada, Nobuyuki*; Noda, Shinei*; Shirai, Katsuyuki*; Funayama, Tomoo; Sakashita, Tetsuya; Kobayashi, Yasuhiko; Nakano, Takashi*
no journal, ,
Sato, Tetsuya; Kaneya, Yusuke*; Asai, Masato; Tsukada, Kazuaki; Toyoshima, Atsushi; Mitsukai, Akina*; Osa, Akihiko; Makii, Hiroyuki; Nishio, Katsuhisa; Hirose, Kentaro; et al.
no journal, ,
The ground state electronic configuration of lawrencium (Lr, Z =103) is predicted to be [Rn]
, which is different from that of the lanthanide homolog Lu [Xe]
due to strong relativistic effects. According to semi-empirical considerations, volatility of Lr is expected to be higher than that of Lu. We have investigated adsorption behavior of 
Lr, which was produced in the reaction of 
Cf(
B, 4n), on a tantalum (Ta) metal surface using a surface ion-source installed into the isotope separator on-line (ISOL) at the JAEA tandem accelerator facility. The observed adsorption behavior of Lr was similar to those of Tb and Lu which have relatively higher adsorption enthalpy on Ta surface. It implies that Lr would have low volatility like such as Lu and Tb.
Sato, Tetsuya; Kaneya, Yusuke*; Asai, Masato; Tsukada, Kazuaki; Toyoshima, Atsushi; Mitsukai, Akina*; Osa, Akihiko; Makii, Hiroyuki; Hirose, Kentaro; Nagame, Yuichiro; et al.
no journal, ,
Our experimental results on the first ionization potential measurement of lawrencium (Lr, element 103) have strongly suggested that the Lr atom has a [Rn]
configuration as a result of the influence of strong relativistic effects. The configuration is different from that expected from the lanthanide homologue, lutetium (Lu). According to a semi-empirical consideration, it is expected that the change of the electronic configuration leads higher volatility of Lr than that of Lu. In this work, adsorption behaviors of Lr and various short-lived rare earth isotopes on a tantalum surface were investigated via observation of their surface ionization efficiencies. It was found that Lr would behave like low volatile rare earth elements such as Lu contrary to the semi-empirical expectation.
Kaneya, Yusuke*; Tomitsuka, Tomohiro; Sato, Tetsuya; Asai, Masato; Tsukada, Kazuaki; Toyoshima, Atsushi; Mitsukai, Akina; Makii, Hiroyuki; Hirose, Kentaro; Osa, Akihiko; et al.
no journal, ,
Kaneya, Yusuke*; Asai, Masato; Sato, Tetsuya; Tomitsuka, Tomohiro; Tsukada, Kazuaki; Toyoshima, Atsushi; Mitsukai, Akina; Makii, Hiroyuki; Hirose, Kentaro; Osa, Akihiko; et al.
no journal, ,
To study the influence of the valence 7p
electronic orbital on chemical properties of lawrencium, a measurement of the adsorption enthalpy of lawrencium was carried out. A new method using a surface ionization technique coupled to an on-line isotope separator was developed, which enabled one to measure temperature dependence of lawrencium surface adsorption on a metallic tantalum surface at high temperature up to 2800 K. The temperature dependences of adsorption of lawrencium as well as various lanthanide elements were investigated with this method, and the adsorption enthalpy of lawrencium was successfully extracted.
Sato, Tetsuya; Kaneya, Yusuke*; Asai, Masato; Tsukada, Kazuaki; Toyoshima, Atsushi; Mitsukai, Akina*; Osa, Akihiko; Makii, Hiroyuki; Hirose, Kentaro; Nagame, Yuichiro; et al.
no journal, ,
Our experimental results on the first ionization potential measurement of lawrencium (Lr, element 103) have strongly suggested that the Lr atom has a [Rn] configuration as a result of the influence of strong relativistic effects. The configuration is different from that expected from the lanthanide homologue, lutetium (Lu). According to a semi-empirical consideration, it is expected that the change of the electronic configuration leads higher volatility of Lr than that of Lu. In this work, adsorption behaviors of Lr and various short-lived rare earth isotopes on a tantalum surface were investigated via observation of their surface ionization efficiencies. It was found that Lr would behave like low volatile rare earth elements such as Lu contrary to the semi-empirical expectation.
