Influence of the 7p_1/2 electronic orbital to chemical bonding of heavy- and transactinide elements

2017 Fiscal Year Final Research Report

• Project/Area Number: 26288028
• Research Category: Grant-in-Aid for Scientific Research (B)
• Allocation Type: Partial Multi-year Fund
• Section: 一般
• Research Field: Inorganic chemistry
• Research Institution: Japan Atomic Energy Agency
• Principal Investigator: ASAI Masato 国立研究開発法人日本原子力研究開発機構, 原子力科学研究部門 先端基礎研究センター, 研究主幹 (20343931)
• Co-Investigator(Renkei-kenkyūsha): SATO Tetsuya 国立研究開発法人日本原子力研究開発機構, 原子力科学研究部門 先端基礎研究センター, 研究副主幹 (40370382) ; TSUKADA Kazuaki 国立研究開発法人日本原子力研究開発機構, 原子力科学研究部門 先端基礎研究センター, 研究主席 (30343916)
• Research Collaborator: KANEYA Yusuke
• Project Period (FY): 2014-04-01 – 2018-03-31
• Keywords: ローレンシウム / イオン化エネルギー / 吸着エンタルピー / 表面電離イオン化 / 真空クロマトグラフィー / ノーベリウム / 超重元素 / 相対論効果

Outline of Final Research Achievements

The first ionization energy of the element 103, Lr, has been successfully measured for the first time. The result revealed that the outermost electron of Lr is very loosely bound. In addition, the adsorption enthalpy of Lr, which represents the volatility of Lr, has been determined for the first time. This result clearly demonstrates that the Lr shows low volatility which is typical to the group-3 elements. On the basis of these results, we have discussed the influence of the 7p_1/2 electronic orbital to the chemical bonding of Lr. The first ionization energies of the element 100-102, Fm, Md, and No, have also been determined. This result have proved for the first time from the view point of electronic orbitals that the actinide series actually terminates at Lr.

Free Research Field

超重元素化学、無機化学、超重核物理、実験核物理