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Adsorption behavior of lawrencium (Lr, Z = 103) on a tantalum surface

Sato, Tetsuya; Kaneya, Yusuke*; Asai, Masato; Tsukada, Kazuaki; Toyoshima, Atsushi; Mitsukai, Akina*; Osa, Akihiko; Makii, Hiroyuki; Hirose, Kentaro; Nagame, Yuichiro; Tomitsuka, Tomohiro*; Shirai, Kaori*; Sato, Daisuke*; Oe, Kazuhiro*; Sakama, Minoru*; Shingu, Kazutoshi*; Naguwa, Ryo*; Kamada, Hiroki*; Miyashita, Sunao*; Kasamatsu, Yoshitaka*; Shigekawa, Yudai*; D$"u$llmann, Ch. E.*; Sch$"a$del, M.*; Kratz, J. V.*; Stora, T.*; Goto, Shinichi*; Eichler, R.*

Our experimental results on the first ionization potential measurement of lawrencium (Lr, element 103) have strongly suggested that the Lr atom has a [Rn]$$7s^25f^{14}7p_{1/2}$$ configuration as a result of the influence of strong relativistic effects. The configuration is different from that expected from the lanthanide homologue, lutetium (Lu). According to a semi-empirical consideration, it is expected that the change of the electronic configuration leads higher volatility of Lr than that of Lu. In this work, adsorption behaviors of Lr and various short-lived rare earth isotopes on a tantalum surface were investigated via observation of their surface ionization efficiencies. It was found that Lr would behave like low volatile rare earth elements such as Lu contrary to the semi-empirical expectation.

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