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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

Positron annihilation methods and applied researches for materials such as polymers

Hirade, Tetsuya

Kagaku To Kogyo, 92(2), p.44 - 54, 2018/02

A positron, an anti-particle of an electron, annihilates with an electron and emits energy that is proportional to mass energy as annihilation $$gamma$$-rays. Positron annihilation methods are applied by detecting these $$gamma$$-rays. The information of annihilation time, energy of $$gamma$$-rays, and direction of $$gamma$$-rays emission has been used for materials science. Here, positron annihilation lifetime, doppler broadening of annihilation $$gamma$$-rays and positron annihilation age-momentum correlation are mainly explained by use of research examples for metals and polymers, etc.

Journal Articles

Discrepancy in the periodic table appears at element 103; Successful measurement of the first ionization potential of lawrencium, element 103

Sato, Tetsuya; Nagame, Yuichiro; Tsukada, Kazuaki

Kagaku To Kogyo, 68(9), p.824 - 826, 2015/09

We successfully confirmed that lawrencium (Lr, element 103) is the last member of actinide series by a measurement of its first ionization potential. Obtained experimental result suggested that the outermost electronic orbital of Lr atom would have p-orbital similar to elements of group-13. Our result triggered again the discussion of the position of Lr and lutetium, the lanthanide homologue of Lr, on the Periodic Table.

Journal Articles

Ultrahigh-peak laser system

Kiriyama, Hiromitsu

Kagaku To Kogyo, 81(8), p.363 - 370, 2007/08

We describe a design, performance and characterization of a high-peak power, high-contrast, high-beam quality laser system for energetic particle generation.

Journal Articles

Name of element 110 and synthesis of new elements 115 and 113

Nagame, Yuichiro

Kagaku To Kogyo, 57(6), P. 624, 2004/06

no abstracts in English

Journal Articles

Recent topics on the synthesis of super heavy elements

Nagame, Yuichiro

Kagaku To Kogyo, 56(1), P. 32, 2003/01

no abstracts in English

Journal Articles

Electrochemical thin-film fabrication of superconductive boride MgB$$_{2}$$

Yoshii, Kenji; Abe, Hideki*

Kagaku To Kogyo, 56(7), p.802 - 804, 2003/00

no abstracts in English

Journal Articles

Deformation behavior of high temperature shape memory alloys before and after neutron irradiation

Hoshiya, Taiji

Kagaku To Kogyo, 75(8), p.379 - 387, 2001/08

no abstracts in English

Journal Articles

Chemical property of element 107 bohrium

Haba, Hiromitsu

Kagaku To Kogyo, 54(5), P. 590, 2001/00

no abstracts in English

Journal Articles

Superheavy elements; Synthesis of new elements 114, 116 and 118

Nishinaka, Ichiro

Kagaku To Kogyo, 53(5), P. 607, 2000/00

no abstracts in English

Journal Articles

New ion generation method with SF$$_{6}$$ plasma

Okoshi, Kiyonori; Saito, Yuichi; Tajima, Satoshi

Kagaku To Kogyo, 52(11), p.1409 - 1412, 1999/11

no abstracts in English

Journal Articles

Stability of transactinide elements

Nagame, Yuichiro

Kagaku To Kogyo, 51(12), P. 1906, 1998/12

no abstracts in English

Journal Articles

Chemical properties of element 106

Tsukada, Kazuaki

Kagaku To Kogyo, 51(4), P. 615, 1998/00

no abstracts in English

Journal Articles

None

Ozawa, Masaki

Kagaku To Kogyo, 50(6), 865- Pages, 1997/06

None

Journal Articles

Si$$_{3}$$N$$_{4}$$ fiber with excellenet thermal resistance, tensile strength and electrical insulating resistance

*; Seguchi, Tadao; *

Kagaku To Kogyo, 49(9), p.1256 - 1258, 1996/00

no abstracts in English

Journal Articles

Synthesis of new elements 110 and 111

Nagame, Yuichiro

Kagaku To Kogyo, 48(8), 946 Pages, 1995/00

no abstracts in English

Journal Articles

None

Yamato, Aiji

Kagaku To Kogyo, 46(11), 1714- Pages, 1993/11

Journal Articles

Electrode processes at microelectrode of superconducting oxide material

Sasaki, Yuji

Kagaku To Kogyo, 45(8), p.1433 - 1434, 1992/08

no abstracts in English

Journal Articles

Chemical bonding of new molecules containing lithium atoms

Kudo, Hiroshi

Kagaku To Kogyo, 45(5), p.941 - 944, 1992/00

no abstracts in English

Journal Articles

Effective recovery of transuranic elements from high-level waste

Kubota, Masumitsu

Kagaku To Kogyo, 44(8), p.1284 - 1287, 1991/00

no abstracts in English

54 (Records 1-20 displayed on this page)