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Journal Articles

Demonstrations for the effect of composite electric fields of molecular ions on the motion of secondary electrons due to ion irradiation

Moribayashi, Kengo

Nuclear Instruments and Methods in Physics Research B, 314, p.30 - 33, 2013/11

 Times Cited Count:4 Percentile:53.77(Instruments & Instrumentation)

Journal Articles

Modification of teflon surface by proton microbeam and nitrogen ion beam

Kitamura, Akane; Sato, Takahiro; Koka, Masashi; Kamiya, Tomihiro; Kobayashi, Tomohiro*

Nuclear Instruments and Methods in Physics Research B, 314, p.82 - 85, 2013/11

 Times Cited Count:5 Percentile:46.51(Instruments & Instrumentation)

Journal Articles

Microscopic evaluation of the absolute fluence distribution of a large-area uniform ion beam using the track-etching technique

Kitamura, Akane; Yamaki, Tetsuya; Yuri, Yosuke; Sawada, Shinichi; Yuyama, Takahiro

Nuclear Instruments and Methods in Physics Research B, 314, p.47 - 50, 2013/11

 Percentile:100(Instruments & Instrumentation)

Journal Articles

Ion-induced changes in semiconductor properties of hydrogenated amorphous silicon

Sato, Shinichiro; Oshima, Takeshi

Nuclear Instruments and Methods in Physics Research B, 314, p.153 - 157, 2013/11

 Times Cited Count:1 Percentile:84.29(Instruments & Instrumentation)

Journal Articles

Preparation of tungsten carbide nanoparticles by ion implantation and electrochemical etching

Kato, Sho; Yamaki, Tetsuya; Yamamoto, Shunya; Hakoda, Teruyuki; Kawaguchi, Kazuhiro; Kobayashi, Tomohiro*; Suzuki, Akihiro*; Terai, Takayuki*

Nuclear Instruments and Methods in Physics Research B, 314, p.149 - 152, 2013/11

 Percentile:100(Instruments & Instrumentation)

We implanted 100 keV W$$^+$$ in unpolished GC substrates at nominal fluences up to $$1.7times10^{17}$$ ions/cm$$^2$$. The implanted samples were electrochemically anodized in a NaOH aqueous solution to etch the surface layer. The analyses were performed by X-ray photoelectron spectroscopy (XPS), Rutherford backscattering spectrometry (RBS), and transmission electron microscopy (TEM). XPS W 4f spectra indicated the formation of carbides as reported previously. The electrochemical etching clearly increased the W concentration on the surface. According to the RBS results, half of the implanted W atoms were retained in the substrate, while the rest should escape to the etching solution. The cross-sectional TEM image revealed a uniform distribution of WC particles with a diameter of less than 10 nm just near the surface region.

Journal Articles

Ion-track membranes of fluoropolymers; Toward controlling the pore size and shape

Yamaki, Tetsuya; Nuryanthi, N.*; Koshikawa, Hiroshi; Asano, Masaharu; Sawada, Shinichi; Hakoda, Teruyuki; Maekawa, Yasunari; Voss, K.-O.*; Severin, D.*; Seidl, T.*; et al.

Nuclear Instruments and Methods in Physics Research B, 314, p.77 - 81, 2013/11

 Times Cited Count:1 Percentile:84.29(Instruments & Instrumentation)

Ion-track membranes of poly(vinylidene fluoride) (PVDF), a type of fluoropolymer, could find wide applications due to its superior chemical and mechanical properties. In order to produce track-etched pores in PVDF films, we have independently employed much milder etching conditions without any oxidant additives in the alkaline etching solution. The goal of this work is to pursue the possibility of varying beam parameters and applying the effect of the etching pretreatment to control the pore size and shape. Ongoing in-situ/on-line analyses at the M-branch of the UNILAC would shed light on the detailed chemistry of not only ion-induced degradation but also the post-irradiation reactivity.

Journal Articles

Applied-voltage dependence on conductometric track etching of poly(vinylidene fluoride) films

Nuryanthi, N.*; Yamaki, Tetsuya; Koshikawa, Hiroshi; Asano, Masaharu; Sawada, Shinichi; Hasegawa, Shin; Maekawa, Yasunari; Katsumura, Yosuke*

Nuclear Instruments and Methods in Physics Research B, 314, p.95 - 98, 2013/11

 Percentile:100(Instruments & Instrumentation)

Our efforts have been focused on ion-track etched membranes of poly(vinylidene fluoride) (PVDF). This study deals with the effect of the transmembrane potential applied during the conductometry in order to offer a higher degree of freedom to control the pore size. We can say that higher voltage application during the conductometry would accelerate the etching in the tracks. The electrophoretic migration of dissolved products occurring out of each pore might be one of the reasons for this enhanced pore evolution and growth.

Journal Articles

Surface amorphization in Al$$_{2}$$O$$_{3}$$ induced by swift heavy ion irradiation

Okubo, Nariaki; Ishikawa, Norito; Sataka, Masao; Jitsukawa, Shiro

Nuclear Instruments and Methods in Physics Research B, 314, p.208 - 210, 2013/11

 Times Cited Count:9 Percentile:25.82(Instruments & Instrumentation)

Microstructure in single crystal Al$$_{2}$$O$$_{3}$$ specimens developed during irradiation by 70-160 MeV-Xe ions has been examined with transmission electron microscope (TEM). Amorphization was observed around 800 nm depth through from ion-beam incident surface of the specimen. The amorphization was also evaluated with XRD technique. TEM observation also indicated that tracks were formed by irradiation at the deeper region than that of the amorphous layers. The number density and size of the tracks have been decreased with the depth from the ion-incident surface. It suggests that amorphization has been occurred by the overlapping of the tracks. It was also obvious that the thickness of the amorphous layers were smaller than those observed in poly-crystal alumina specimens. This may be interpreted by the difference of electronic energy loss in the specimen; lower energy loss for single crystal specimens for their crystallographic orientation against to the incident ion-beam.

Journal Articles

Development of dual-beam system using an electrostatic accelerator for in-situ observation of swift heavy ion irradiation effects on materials

Matsuda, Makoto; Asozu, Takuhiro; Sataka, Masao; Iwase, Akihiro*

Nuclear Instruments and Methods in Physics Research B, 314, p.43 - 46, 2013/11

 Percentile:100(Instruments & Instrumentation)

no abstracts in English

Journal Articles

Time-of-flight secondary ion mass spectrometry with energetic cluster ion impact ionization for highly sensitive chemical structure characterization

Hirata, Koichi*; Saito, Yuichi; Chiba, Atsuya; Yamada, Keisuke; Narumi, Kazumasa

Nuclear Instruments and Methods in Physics Research B, 314, p.39 - 42, 2013/11

 Times Cited Count:1 Percentile:84.29(Instruments & Instrumentation)

Journal Articles

Study on ferromagnetic ordering of FeRh thin films induced by energetic heavy ion irradiation by means of X-ray magnetic circular dichroism

Aiko, Kazuma*; Toki, Atsushi*; Okuda, Shuichi*; Saito, Yuichi; Kamiya, Tomihiro; Nakamura, Tetsuya*; Kinoshita, Toyohiko*; Iwase, Akihiro*; Matsui, Toshiyuki*

Nuclear Instruments and Methods in Physics Research B, 314, p.99 - 102, 2013/11

 Times Cited Count:1 Percentile:84.29(Instruments & Instrumentation)

Oral presentation

Study on charge exchange gases in tandem accelerators for cluster ion acceleration

Saito, Yuichi; Chiba, Atsuya; Yamada, Keisuke; Narumi, Kazumasa

no journal, , 

Oral presentation

Absolute detection efficiency of a high sensitivity microchannel plate

Matoba, Shiro; Moriya, Sosuke*; Koizumi, Tetsuo*; Ishikawa, Manabu*; Takahashi, Karin*; Shiromaru, Haruo*

no journal, , 

Oral presentation

Effects of ion-track formation and its overlapping in uranium dioxide ceramics irradiated by swift heavy ions

Ishikawa, Norito; Sonoda, Takeshi*; Sawabe, Takashi*; Sataka, Masao

no journal, , 

UO$$_{2}$$ is highly radiation-resistant material, and the origin of the radiation-resistance is analyzed in this study.

Oral presentation

Thickness dependence of secondary-electron yield from carbon foils bombarded with 62.5-300-keV/u H$$_{2}$$$$^{+}$$ and C$$_{2}$$$$^{+}$$ ions

Narumi, Kazumasa; Takahashi, Yasuyuki*; Chiba, Atsuya; Saito, Yuichi; Yamada, Keisuke; Ishikawa, Norito; Sugai, Hiroyuki*; Maeda, Yoshihito

no journal, , 

no abstracts in English

Oral presentation

Incident energy dependences of transient species in water by ion beam pulse radiolysis study

Iwamatsu, Kazuhiro; Taguchi, Mitsumasa; Sugo, Yumi; Kurashima, Satoshi; Yamashita, Shinichi; Katsumura, Yosuke

no journal, , 

no abstracts in English

Oral presentation

Charge state distributiion of 1 MeV/u tungsten ions after penetration of carbon foils

Ota, Yushi*; Mamiya, Takuya*; Imai, Makoto*; Shibata, Hiromi*; Ito, Akio*; Sataka, Masao

no journal, , 

no abstracts in English

17 (Records 1-17 displayed on this page)
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