Zobrazeno 1 - 10
of 13
pro vyhledávání: '"Ken Wada"'
Publikováno v:
Nuclear Instruments and Methods in Physics Research Section B: Beam Interactions with Materials and Atoms. 480:49-55
A sealed positron source that can sufficiently reduce the backscattered component was fabricated using an aqueous 22 NaCl solution and a graphite backing material. The spin polarization of the emitted positrons was evaluated as 39%, which was 1.7 tim
Autor:
Shimpei Iida, Ken Wada, Masaki Maekawa, Hironao Iwamori, Yasuyuki Nagashima, Atsuo Kawasuso, A. Miyashita
Publikováno v:
Journal of physics. Condensed matter : an Institute of Physics journal. 33(3)
Positronium formation at 4H SiC(0001) surfaces were investigated upon the removal of natural oxide layers by hydrofluoric acid etching and heat treatment at 1000 K in ultra-high vacuum. Two types of positronium were observed in the positronium time-o
Autor:
Atsuo Kawasuso, Masaki Maekawa, Masanori Fujinami, Izumi Mochizuki, Tetsuroh Shirasawa, Toshio Takahashi, Ken Wada, Toshio Hyodo
Publikováno v:
e-Journal of Surface Science and Nanotechnology. 16:313-319
Autor:
Ken Wada, Shimpei Iida, Izumi Mochizuki, Yasuyuki Nagashima, Hiroki Terabe, Takayuki Tachibana, Akira Yagishita, Toshio Hyodo
Publikováno v:
Defect and Diffusion Forum. 373:309-312
We have studied the emission of ortho-positronium from alkali-metal coated polycrystalline tungsten surfaces. The positronium time-of-flight spectra show that the yield of the 5 eV positronium component increases by alkali-metal coating. In addition,
Autor:
Tetsuo Shidara, Masaki Maekawa, Izumi Mochizuki, Toshio Hyodo, Atsuo Kawasuso, Masao Kimura, Ken Wada
Publikováno v:
Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment. 975:164161
A pulse stretcher providing a 5.2 keV quasi-continuous beam has been developed for use with a pulsed slow-positron beam generated by an electron linear accelerator operated with a repetition frequency of 50 Hz. Pulses of positrons, of width 1.2 µs,
Autor:
Seiji Sakai, Izumi Mochizuki, Yuki Fukaya, Shiro Entani, Toshio Hyodo, Ken Wada, Shin-ichi Shamoto
Publikováno v:
Carbon. 103:1-4
The spacing between graphene and metal substrates has been investigated using total-reflection high-energy positron diffraction (TRHEPD). The rocking curve analysis performed, based on the dynamical diffraction theory, shows that the spacing between
Autor:
Atsuo Kawasuso, Ken Wada, Toshio Hyodo, Izumi Mochizuki, Tetsuo Shidara, Masaki Maekawa, Kiyotaka Asakura, Yuki Fukaya, Hiroko Ariga
Publikováno v:
Physical chemistry chemical physics. 18(10):7085-7092
The exact structure of the rutile-TiO2(110)-(1 × 2) surface, which had been under debate over the past 30 years, was investigated using the newly developed technique of total-reflection high-energy positron diffraction (TRHEPD), which is a positron
Autor:
Atsuo Kawasuso, T. Watanabe, Shiro Entani, Seiji Sakai, A. Miyashita, Masaki Maekawa, Ken Wada
Publikováno v:
Physical Review B. 97
In spin-polarized surface positronium annihilation measurements, the spin polarizations of graphene and $h$-BN on Co(0001) were higher than those on Ni(111), while no significant differences were seen between graphene and $h$-BN on the same metal. Th
Autor:
Takahiro Teramoto, Kyo Nakajima, Hiroshi Akagi, Shinichirou Minemoto, Hirofumi Sakai, Shintaro Yoshida, Ken Wada, Tadashi Togashi, Makina Yabashi, Kensuke Tono, Takashi Fujikawa, Shigeki Owada, Kaori Niki, Takuya Majima, Shota Tsuru, Akira Yagishita
Publikováno v:
Scientific Reports
We have successfully determined the internuclear distance of I2 molecules in an alignment laser field by applying our molecular structure determination methodology to an I 2p X-ray photoelectron diffraction profile observed with femtosecond X-ray fre
Autor:
Satoshi Yoshida, Ken Wada, Takahiro Fujimura, Akihiro Yamada, Mitsuo Kato, Jun Matsuoka, Naohiro Soga
Publikováno v:
Frontiers in Materials, Vol 3 (2016)
It is well known that glass undergoes elastic and inelastic deformation under a sharp diamond indenter. Although brittle or less-brittle behavior of glass must be connected with such mechanical responses of glass under the indenter, there has been li