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Report No.
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Adsorption of lawrencium on a metallic tantalum surface at high temperature

Kaneya, Yusuke*; Asai, Masato; Sato, Tetsuya; Tomitsuka, Tomohiro; Tsukada, Kazuaki; Toyoshima, Atsushi; Mitsukai, Akina; Makii, Hiroyuki; Hirose, Kentaro; Osa, Akihiko; Nishio, Katsuhisa; Nagame, Yuichiro; Sato, Daisuke*; Shirai, Kaori*; Oe, Kazuhiro*; Goto, Shinichi*; Sakama, Minoru*; Naguwa, Ryo*; Shingu, Kazutoshi*; Miyashita, Sunao*; Kamada, Hiroki*; Shibata, Michihiro*; Shigekawa, Yudai*; Kasamatsu, Yoshitaka*; Steinegger, P.*; Eichler, R.*; Grund, J.*; Eberhardt, K.*; Runke, J.*; Th$"o$rle-Pospiech, P.*; D$"u$llmann, Ch. E.*; Trautmann, N.*; Kratz, J. V.*; Yakushev, A.*; Pershina, V.*; Sch$"a$del, M.*

To study the influence of the valence 7p$$_{1/2}$$ electronic orbital on chemical properties of lawrencium, a measurement of the adsorption enthalpy of lawrencium was carried out. A new method using a surface ionization technique coupled to an on-line isotope separator was developed, which enabled one to measure temperature dependence of lawrencium surface adsorption on a metallic tantalum surface at high temperature up to 2800 K. The temperature dependences of adsorption of lawrencium as well as various lanthanide elements were investigated with this method, and the adsorption enthalpy of lawrencium was successfully extracted.

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