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

• 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
• Project Status: Completed (Fiscal Year 2017)
• Budget Amount: ¥16,250,000 (Direct Cost: ¥12,500,000、Indirect Cost: ¥3,750,000); Fiscal Year 2017: ¥1,950,000 (Direct Cost: ¥1,500,000、Indirect Cost: ¥450,000); Fiscal Year 2016: ¥2,470,000 (Direct Cost: ¥1,900,000、Indirect Cost: ¥570,000); Fiscal Year 2015: ¥4,940,000 (Direct Cost: ¥3,800,000、Indirect Cost: ¥1,140,000); Fiscal Year 2014: ¥6,890,000 (Direct Cost: ¥5,300,000、Indirect Cost: ¥1,590,000)
• 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 / 表面電離イオン化法 / 基礎無機化学 / 超重元素化学 / 原子・分子物理 / 原子分子 / メンデレビウム / フェルミウム

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.

Research Products

• [Int'l Joint Research] GSI/University of Mainz/Helmhortz-Institute Mainz(ドイツ)
• [Int'l Joint Research] Paul Scherrer Institute/University of Bern/CERN(スイス)
• [Int'l Joint Research] University of Groningen(オランダ)
• [Int'l Joint Research] GSI/University of Mainz/Helmhortz-Institute Mainz(ドイツ)
• [Int'l Joint Research] Paul Scherrer Institute/University of Bern/CERN(スイス)
• [Int'l Joint Research] University of Groningen(オランダ)
• [Int'l Joint Research] Paul Scherrer Institute/University of Bern/CERN(スイス)
• [Int'l Joint Research] GSI/University of Mainz/Helmhortz-Institut Mainz(ドイツ)
• [Journal Article] First ionization potential of the heaviest actinide lawrencium, element 103 (2016)
  • Author(s): T.K. Sato, M. Asai, A. Borschevsky, T. Stora, N. Sato, Y. Kaneya, K. Tsukada, Ch.E. Duellmann, K. Eberhardt, E. Eliav, S. Ichikawa, U. Kaldor, J.V. Kratz, S. Miyashita, Y. Nagame, K. Ooe, A. Osa, D. Renisch, J. Runke, M. Schaedel, P. Thoerle-Pospiech, A. Toyoshima, N. Trautmann
  • Journal Title: EPJ Web of Conferences Volume: 131 Pages: 05001-05001
  • DOI: 10.1051/epjconf/201613105001
  • Peer Reviewed / Open Access / Int'l Joint Research
• [Journal Article] Vacuum Chromatography of Tl on SiO2 at the Single-Atom Level (2016)
  • Author(s): P. Steinegger, M. Asai, R. Dressler, R. Eichler, Y. Kaneya, A. Mitsukai, Y. Nagame, D. Piguet, T.K. Sato, M. Schaedel, S. Takeda, A. Toyoshima, K. Tsukada, A. Tuerler, A. Vascon
  • Journal Title: The Journal of Physical Chemistry C Volume: 120 Issue: 13 Pages: 7122-7132
  • DOI: 10.1021/acs.jpcc.5b12033
  • Peer Reviewed / Int'l Joint Research
• [Journal Article] Measurement of the First Ionization Potential of Lawrencium, Element 103 (2015)
  • Author(s): T.K. Sato, M. Asai, A. Borschevsky, T. Stora, N. Sato, Y. Kaneya, K. Tsukada, Ch.E. Duellmann, K. Eberhardt, E. Eliav, S. Ichikawa, U. Kaldor, J.V. Kratz, S. Miyashita, Y. Nagame, K. Ooe, A. Osa, D. Renisch, J. Runke, M. Schaedel, P. Thoerle-Pospiech, A. Toyoshima, N. Trautmann
  • Journal Title: Nature Volume: Vol. 520 Issue: 7546 Pages: 209-211
  • DOI: 10.1038/nature14342
  • Peer Reviewed
• [Presentation] Adsorption of Lawrencium (Lr) on a Metallic Tantalum (Ta) Surface (2017)
  • Author(s): Y. Kaneya, T. Tomitsuka, T.K. Sato, M. Asai, K. Tsukada, A. Toyoshima, A. Mitsukai, H. Makii, K. Hirose, A. Osa, K. Nishio, Y. Nagame, 他24名
  • Organizer: APSORC17: 6th Asian-Pacific Symposium on Radiochemistry
  • Int'l Joint Research
• [Presentation] Adsorption Behavior of Lawrencium on Tantalum (2017)
  • Author(s): Y. Kaneya, T. Tomitsuka, T.K. Sato, M. Asai, K. Tsukada, A. Toyoshima, A. Mitsukai, H. Makii, K. Hirose, A. Osa, K. Nishio, Y. Nagame, 他24名
  • Organizer: SHE 2017: 3rd Symposium on Super Heavy Elements
  • Int'l Joint Research
• [Presentation] Measurements of the first ionization potentials of heavy actinides (2017)
  • Author(s): T.K. Sato, M. Asai, Y. Kaneya, K. Tsukada, A. Toyoshima, A. Mitsukai, S. Takeda, A. Vascon, M. Sakama, 他19名
  • Organizer: CHE 9: 9th Workshop on the Chemistry of the Superheavy Elements
  • Int'l Joint Research
• [Presentation] Adsorption of Lawrencium on a Metallic Tantalum Surface at High Temperature (2017)
  • Author(s): Y. Kaneya, M. Asai, T.K. Sato, T. Tomitsuka, K. Tsukada, A. Toyoshima, A. Mitsukai, H. Makii, K. Hirose, A. Osa, K. Nishio, Y. Nagame, 他24名
  • Organizer: CHE 9: 9th Workshop on the Chemistry of the Superheavy Elements
  • Int'l Joint Research
• [Presentation] JAEA ISOL Facility - Planned Experiments - (2017)
  • Author(s): M. Asai
  • Organizer: Workshop for Einsteinium Campaign
  • Int'l Joint Research
• [Presentation] Fission and nuclear-structure studies using the 254Es target (2017)
  • Author(s): M. Asai
  • Organizer: The 2017 Symposium on Nuclear Data
  • Invited
• [Presentation] 103番元素ローレンシウム(Lr)のタンタル金属表面における吸着挙動 (2016)
  • Author(s): 金谷佑亮, 佐藤哲也, 浅井雅人, 塚田和明, 豊嶋厚史, 水飼秋菜, 長明彦, 牧井宏之, 西尾勝久, 廣瀬健太郎, 永目諭一郎, 冨塚知博, 白井香里, 佐藤大輔, 大江一弘, 後藤真一, 宮下直, 新宮一駿, 名桑良, 柴田理尋, 鎌田裕生, 笠松良崇, 重河優大, 阪間稔, 他12名
  • Organizer: 2016日本放射化学会年会・第60回放射化学討論会
  • Place of Presentation: 新潟大学五十嵐キャンパス（新潟県新潟市）
  • Year and Date: 2016-09-10
• [Presentation] 重アクチノイド元素の第一イオン化エネルギー (2016)
  • Author(s): 佐藤哲也, 浅井雅人, 金谷佑亮, 塚田和明, 豊嶋厚史, 水飼秋菜, 武田晋作, 阪間稔, 佐藤大輔, 大江一弘, 重河優大, 牧井宏之, 長明彦, 市川進一, 永目諭一郎, A. Borschevsky, M. Schaedel, Ch.E. Duellmann, J.V. Kratz, T. Stora
  • Organizer: 2016日本放射化学会年会・第60回放射化学討論会
  • Place of Presentation: 新潟大学五十嵐キャンパス（新潟県新潟市）
  • Year and Date: 2016-09-10
• [Presentation] Adsorption behavior of Lr on a Ta surface at high temperature (2016)
  • Author(s): Y. Kaneya, M. Asai, Ch.E. Duellmann, K. Eberhardt, R. Eichler, S. Goto, J. Grund, K. Hirose, H. Kamada, Y. Kasamatsu, J.V. Kratz, H. Makii, A. Mitsukai, S. Miyashita, Y. Nagame, R. Naguwa, K. Nishio, K. Ooe, A. Osa, V. Pershina, J. Runke, M. Sakama, D. Sato, T.K. Sato, 他12名
  • Organizer: 9th International Conference on Nuclear and Radiochemistry (NRC9)
  • Place of Presentation: ヘルシンキ（フィンランド）
  • Year and Date: 2016-08-29
  • Int'l Joint Research
• [Presentation] 表面電離イオン化効率に寄与する原子とイオンの励起準位の効果 (2014)
  • Author(s): 浅井 雅人, 佐藤 哲也, 金谷 佑亮
  • Organizer: 2014日本放射化学会年会
  • Place of Presentation: 名古屋大学（愛知県・名古屋市）
  • Year and Date: 2014-09-11 – 2014-09-13
• [Remarks] 重元素核科学研究グループホームページ
  • URL: https://asrc.jaea.go.jp/soshiki/gr/HENS-gr/index.html
• [Remarks] 重元素核科学研究グループホームページ
  • URL: http://asrc.jaea.go.jp/soshiki/gr/HENS-gr/index.html
• [Remarks] 103番元素が解く、周期表のパズル －ローレンシウム（Lr）のイオン化エネルギー測定に成功－
  • URL: http://www.jaea.go.jp/02/press2015/p15040901/
• [Remarks] 103番元素ローレンシウムの第一イオン化エネルギー測定
  • URL: http://asrc.jaea.go.jp/soshiki/gr/schaedel-gr/Lr-IP/Lr-IP-e.htm