Initialising ...
Initialising ...
Initialising ...
Initialising ...
Initialising ...
Initialising ...
Initialising ...
Sekiguchi, Tetsuhiro; Yokoyama, Keiichi; Yaita, Tsuyoshi
e-Journal of Surface Science and Nanotechnology (Internet), 20(3), p.186 - 195, 2022/07
Cesium-135 having long life, 2.3 million y, that is contained in nuclear wastes may cause long-term pollution. Technology of isotopic separation of such long lived nuclide is indispensable not only for its volume reduction but also annihilation by nuclear transmutation. The recovery of atomic Cs from molecular CsI is mandatory. We have investigated fullerene C
as a potential absorber for Cs. Angle-resolved X-ray photoelectron spectroscopy, AR-XPS has been used to analyze the depth concentration distribution of Cs. Experiments were performed at soft X-ray beamline BL27A at KEK PF facility. We report on the annealing effect after deposition of Cs and the effect of heating substrate during deposition. For Cs/C sample, the intensity ratio of Cs-3d/C-1s increased in double at the high temperature. This suggests that Cs atoms remain in the material at high temperatures. On the other hand, for CsI/C, the intensity ratio does not change much by elevating temperatures.
film revealed by element-specific X-ray magnetic circular dichroismSumida, Kazuki; Takeda, Yukiharu; Kusaka, Shotaro*; Kobayashi, Katsuyoshi*; Hirahara, Toru*
no journal, ,
ortho-para conversionUeta, Hirokazu; Fukutani, Katsuyuki
no journal, ,
1 surface oxidation at room temperatureYoshigoe, Akitaka; Tsuda, Yasutaka; Tominaga, Aki; Sakamoto, Tetsuya; Ogawa, Shuichi*; Takakuwa, Yuji*
no journal, ,
The basic understanding of the oxidation at Si surfaces by oxygen gas has been important to develop advanced metal-oxide-semiconductor devices. In our previous study, we succeeded to detect a satellite peak located at lower binding energy sides of the main peak (Si-O-Si) in the Si(001)21 surface oxidation. This peak has been considered to be due to the molecularly adsorbed oxygen. In this study, we studied the incident O energy dependence of this adsorbate by using real-time photoemission spectroscopy. All experiments were conducted at the surface experimental station (SUREAC2000) at BL23SU in SPring-8. It was found that the satellite peak was clearly observed. This result also implies the existence of a precursor state of adsorbed oxygen dissociation even for 0.06 eV.
(0001) at low temperatureFukaya, Yuki; Lee, C.-C.*; Fleurence, A.*; Hasegawa, Yukio*; Ozaki, Taisuke*; Yamada-Takamura, Yukiko*
no journal, ,
no abstracts in English
/n- and p-Si(001) interfacesTsuda, Yasutaka; Ogawa, Shuichi*; Yoshigoe, Akitaka; Sakamoto, Tetsuya; Takakuwa, Yuji*
no journal, ,
Kamiya, Junichiro; Takano, Kazuhiro; Wada, Kaoru; Yuza, Hiromu*
no journal, ,
Titanium is one of the getter materials. In high-power beam accelerators, titanium has been used as the beam pipe chamber material due to its low radioactivation characteristics. The ordinal titanium surface has no getter function because it is covered with titanium-oxide film. The new technique, which removes the titanium-oxide surface by the sputtering and makes the titanium vacuum chamber itself the vacuum pump like NEG coated chamber, has been developed. After sputtering the inner surface of the titanium chamber, we obtained clear evidence that shows the chamber acts as a vacuum pump. We have also tried to make a titanium chamber with a getter function only by baking. Dependence of the getter characteristics on the baking temperature has been obtained.
Yano, Masahiro; Asaoka, Hidehito
no journal, ,
Graphene nanoribbons that were bottom-up synthesized from self-assembled precursor monolayers on Au(100) and Au(111) were observed by using a scanning tunneling microscope (STM). It was revealed that the molecular orientation of the self-assembled monolayers decides the orientation direction of the graphene nanoribbons. In particular, the orientation direction of the graphene nanoribbons coincides with the one-dimensional uneven of the surface reconstruction structure on Au(100). It means that the controllability of graphene nanoribbon orientation on Au(100) is higher than that of Au(111). This is an important finding for the device application of graphene nanoribbons.
; Electronic structure of the hydrogen-like defects and their potential use in depth-resolved detection of oxygen vacanciesIto, Takashi; Higemoto, Wataru; Koda, Akihiro*; Shimomura, Koichiro*
no journal, ,
