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Journal Articles

First ionization potentials of Fm, Md, No and Lr; Verification of filling-up of 5f electrons and confirmation of the actinide series

Sato, Tetsuya

Kagaku To Kogyo, 72(10), P. 867, 2019/10

We conducted measurements of the first ionization potential (IP$$_1$$) of the heavy actinide elements, lawrencium (Lr, $$Z = 103$$), nobelium (No, $$Z = 102$$), mendelevium (Md, $$Z = 101$$) and fermium (Fm, $$Z = 100$$) by using a novel method based on a surface ionization process. The IP$$_1$$ measurements have been performed using the ISOL (Isotope Separator On-Line) system equipped with a surface ion-source with short-lived heavy actinide isotopes, $$^{256}$$Lr ($$T_{1/2}$$ = 27s), $$^{257}$$No ($$T_{1/2}$$ = 24.5s), $$^{251}$$Md ($$T_{1/2}$$ = 4.27 min), and $$^{249}$$Fm ($$T_{1/2}$$ = 2.6 min). Our experimental results clearly showed that the IP$$_1$$ of Lr is distinctly low among actinide elements. Moreover, No has the highest IP$$_1$$ among them due to its full-filled 5f and 7s orbitals; the IP$$_1$$ value increased with an atomic number up to No and decreased dramatically at Lr, indicating the similar trend with that of heavy lanthanide elements. Therefore, we concluded Lr would be the last member of the actinide series.

Journal Articles

Status and prospects of Heavy element nuclear chemistry research at JAERI

Nagame, Yuichiro; Asai, Masato; Haba, Hiromitsu; Tsukada, Kazuaki; Goto, Shinichi; Sakama, Minoru; Nishinaka, Ichiro; Toyoshima, Atsushi; Akiyama, Kazuhiko; Ichikawa, Shinichi

Journal of Nuclear and Radiochemical Sciences, 3(1), p.129 - 132, 2002/06

no abstracts in English

Oral presentation

First ionization potential measurements of heavy actinides, lawrencium and nobelium

Sato, Tetsuya

no journal, , 

The experimental determination of the first ionization potential (IP) yields information on the electronic structure of the element. We successfully ionized and mass-separated $$^{257}$$No and $$^{256}$$Lr with efficiencies ($$I_{rm eff}$$) of (0.5 $$pm$$ 0.1)% and (36 $$pm$$ 7)% at 2800 K, respectively. From these $$I_{rm eff}$$ values, IP values of No and Lr were determined based on the relationship between $$I_{rm eff}$$ and IP. Our values are in good agreement with the predicted ones by theoretical calculations.

Oral presentation

Chemical & atomic studies of the heaviest elements with JAEA-ISOL; Measurements of the first ionization potentials and study of thermochemical properties

Sato, Tetsuya

no journal, , 

The chemical and atomic properties of the heavy elements with atomic numbers Z $$>$$ 100, affected by strong relativistic effects, are studied at an-atom-at-a-time scale using the JAEA-ISOL. We successfully determined the first ionization potential (IP$$_1$$) values of heavy actinide elements from fermium (Fm, Z = 100) to lawrencium (Lr, Z = 103) by using a surface ion-source installed in the Isotope Separator On-Line (ISOL) at the JAEA tandem accelerator facility. The adsorption behavior of Lr is being studied by a newly developed method combining vacuum chromatography with surface ionization in a metallic column/ionizer of the ISOL as well.

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