Online ISSN: 1884-4111 Print ISSN: 0033-8303
Radioisotopes 67(10): 495-505 (2018)

連載講座Serial Lecture

表面電離法による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Measurement of the First Ionization Potential of Lawrencium (Z=103) Using Surface Ionization Technique

日本原子力研究開発機構先端基礎研究センターJapan Atomic Energy Agency ◇ 319–1195 茨城県那珂郡東海村白方2–4 ◇ 2–4 Shirakata, Tokai, Ibaraki pref. 319–1195, Japan

発行日:2018年10月15日Published: October 15, 2018


We successfully determined the first ionization potential of lawrencium, element 103, experimentally for the first time. Precise and accurate experimental determination of the first ionization potential gives direct information on the binding energy of valence electron which would be affected by strong relativistic effects. However, such measurements are hampered by the difficulty in obtaining the heaviest elements on scales of more than one atom at a time. We have newly developed an efficient surface ion-source and a detection system coupled to a mass-separator, and a novel measurement method using surface ionization technique.

Key words: lawrencium; the first ionization potential; actinide; relativistic effect; surface ionization

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