- 著者
- H. Kenji YOSHIHARA
- 出版者
- 日本学士院
- 雑誌
- Proceedings of the Japan Academy, Series B (ISSN:03862208)
- 巻号頁・発行日
- vol.84, no.7, pp.232-245, 2008-07-30 (Released:2008-07-30)
- 参考文献数
- 35
- 被引用文献数
- 5
This review article deals with a new element ‘nipponium’ reported by Masataka Ogawa in 1908, and with its scientific and science historical background. Ogawa positioned nipponium between molybdenum and ruthenium in the periodic table. From a modern chemical viewpoint, however, nipponium is ascribable to the element with Z=75, namely rhenium, which was unknown in 1908. The reasons for this corrected assignment of nipponium are (1) its optical spectra, (2) its atomic weight when corrected, (3) its relative abundance in molybdenite, the same being true with rhenium. Recently some important evidence was found among the Ogawa’s personal collection preserved by his family. Deciphering the X-ray spectra revealed that the measured spectra of the nipponium sample that Ogawa brought from University College, London clearly showed the presence of the element 75 (rhenium). Thus was resolved the mysterious story of nipponium, which had continued for almost a century. It is concluded that nipponium was identical to rhenium.(Communicated by Toshimitsu YAMAZAKI, M.J.A.)
- 著者
- Shigeru IKUTA Kenji YOSHIHARA Takanobu SHIOKAWA
- 出版者
- Atomic Energy Society of Japan
- 雑誌
- Journal of Nuclear Science and Technology (ISSN:00223131)
- 巻号頁・発行日
- vol.14, no.9, pp.661-663, 1977-09-25 (Released:2008-04-18)
- 参考文献数
- 8
- 被引用文献数
- 1
The behaviors of CH3He+ and C2H5He+ formed by the decay of CH3T and C2H5T were studied theoretically using the STO-3G molecular orbital method and was compared with that of HHe+ in the decay of HT. It was clearly shown that the ground state daughter ions CH3He+ and C2H5He>+ dissociate instantly to give CH3+ and C2H5+ because their poten-tial energy curves are repulsive, whereas the daughter ion HHe+ in the ground state does not dissociate. The transition probability to the ground state ions of CH3He+ and of C2H5He+ are computed to be 66.5 and 64.8%, respectively. These values are in fairly good accordance with those obtained experimentally.