Transmission properties of a 4-MeV C ion beam entering a narrow gap between two cylindrical glass surfaces

Motohashi, Kenji*; Saito, Yuichi; Miyawaki, Nobumasa; Matsuo, Yutaro*

Japanese Journal of Applied Physics, 52(7), p.076301_1 - 076301_6, 2013/07

https://doi.org/10.7567/JJAP.52.076301

Optical emission spectroscopy by Ar ion sputtering of Ti surface under O environment

Motohashi, Kenji*; Saito, Yuichi; Kitazawa, Sin-iti

Applied Surface Science, 257(13), p.5789 - 5792, 2011/04

https://doi.org/10.1016/j.apsusc.2011.01.103

Radiation-induced luminescence from Au, Pt/TiO by 10 keV O and N irradiation

Kitazawa, Sin-iti; Saito, Yuichi; Motohashi, Kenji*

no journal, , 

Photon emission produced by radiation irradiation is called radiation-induced luminescence (RIL), which has characteristic wavelengths for band structures, lattice defects and impurity levels. For RIL of TiO by 10 keV O irradiations, some UV and visible bands were observed at room temperature. The range of 10 keV O into TiO is about 30 nm, and the surface effect must be considered in this study. In this work, RIL spectra of Au or Pt coated TiO by 10 keV O and N irradiations were observed. The TiO film is prepared by anatase powder, which consists of nano-photochemistry diodes. Many atomic lines, visible bands at 2.0 and 2.6 eV and a UV band at 3.9 eV, were observed. This study clarifies part of the RIL mechanism of TiO, which is to be expected for a photocatalytic material.

Ion scattering spectroscopy by 1-2 MeV C for polarity-controlled ZnO surfaces

Motohashi, Kenji*; Saito, Yuichi; Miyawaki, Nobumasa; Kamiya, Tomihiro

no journal, , 

no abstracts in English

Ion scattering on polarity-controlled ZnO surfaces by MeV ions

Motohashi, Kenji*; Saito, Yuichi; Miyawaki, Nobumasa

no journal, , 

An almost complete reflection of a 2.5-MeV proton beam on an evaporated Au layer was found at a grazing-incidence angle. We studied the mechanism of collisions between MeV ions and polarity-controlled ZnO surfaces in order to investigate the efficient reflection of swift ions on solid surfaces. The experiment was performed at the TIARA. C+ (2 MeV) ion beams were irradiated on the ZnO single crystals with two opposite surfaces, so-called "Zn and O faces", and the energy of the ions scattered at 3 with respect to the beam axis was measured. It was revealed that the energy distribution of the scattered ions on the two opposite surfaces at an incidence angle of 2 were significantly different. A larger energy loss and a higher yield of scattered ions on the Zn face compared to the O face suggest that elastic collisions with surface atoms play key roles.