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Journal Articles

Spectroscopic determination of interconversion rates among three nuclear spin isomers of methane in crystalline II

Sugimoto, Takeru*; Nasu, Hirokazu*; Arakawa, Ichiro*; Yamakawa, Koichiro

Journal of Chemical Physics, 150(18), p.184302_1 - 184302_5, 2019/05

We measured infrared absorption spectra of crystalline II of methane and succeeded in detecting a prominent Q(2) peak by rapid cooling after annealing as well as previously reported rovibrational and librational-vibrational peaks. The integral intensities of the R(0), R(1), and Q(2) peaks were found to show biexponential dependence on time. This clearly demonstrates the interconversion among the three nuclear-spin isomers occupying low-lying rotational levels.

Journal Articles

Visualization of focused proton beam dose distribution by atomic force microscopy using blended polymer films based on polyacrylic acid

Omichi, Masaaki*; Takano, Katsuyoshi*; Sato, Takahiro; Kamiya, Tomihiro; Ishii, Yasuyuki; Okubo, Takeru; Koka, Masashi; Kada, Wataru; Sugimoto, Masaki; Nishikawa, Hiroyuki*; et al.

Journal of Nanoscience and Nanotechnology, 12, p.7401 - 7404, 2012/09

 Times Cited Count:2 Percentile:11.6(Chemistry, Multidisciplinary)

Journal Articles

Microprocessing of arched bridge structures with epoxy resin by proton beam writing

Takano, Katsuyoshi*; Asano, Atsushi*; Maeyoshi, Yuta*; Marui, Hiromi*; Omichi, Masaaki*; Saeki, Akinori*; Seki, Shu*; Sato, Takahiro; Ishii, Yasuyuki; Kamiya, Tomihiro; et al.

Journal of Photopolymer Science and Technology, 25(1), p.43 - 46, 2012/07

 Times Cited Count:2 Percentile:6.61(Polymer Science)

Journal Articles

Fabrication of concave and convex structure array consisted of epoxy long-nanowires by light and heavy ion beams lithography

Takano, Katsuyoshi*; Sugimoto, Masaki; Asano, Atsushi*; Maeyoshi, Yuta*; Marui, Hiromi*; Omichi, Masaaki*; Saeki, Akinori*; Seki, Shu*; Sato, Takahiro; Ishii, Yasuyuki; et al.

Transactions of the Materials Research Society of Japan, 37(2), p.237 - 240, 2012/06

Journal Articles

Fabrication of poly(9,9'-dioctylfluorene)-based nano- and microstructures by proton beam writing

Maeyoshi, Yuta*; Takano, Katsuyoshi*; Asano, Atsushi*; Marui, Hiromi*; Omichi, Masaaki*; Sato, Takahiro; Kamiya, Tomihiro; Ishii, Yasuyuki; Okubo, Takeru; Koka, Masashi; et al.

Japanese Journal of Applied Physics, 51(4R), p.045201_1 - 045201_4, 2012/04

 Times Cited Count:1 Percentile:4.44(Physics, Applied)

Journal Articles

3D micro-fabrication utilized superimposing technique with focused MeV ion beams

Takano, Katsuyoshi*; Sato, Takahiro; Kamiya, Tomihiro; Ishii, Yasuyuki; Okubo, Takeru; Koka, Masashi; Kada, Wataru; Sugimoto, Masaki; Seki, Shuhei*; Nishikawa, Hiroyuki*

JAEA-Review 2011-043, JAEA Takasaki Annual Report 2010, P. 162, 2012/01

Journal Articles

Nano-micro processing of epoxy resin systems by ion beam lithography with multiple energies and species

Takano, Katsuyoshi; Sato, Takahiro; Ishii, Yasuyuki; Koka, Masashi; Kamiya, Tomihiro; Okubo, Takeru; Sugimoto, Masaki; Nishikawa, Hiroyuki*; Seki, Shu*

Transactions of the Materials Research Society of Japan, 36(3), p.305 - 308, 2011/09

Journal Articles

Fabrication of nanowires by varying energy microbeam lithography using heavy ions at the TIARA

Kamiya, Tomihiro; Takano, Katsuyoshi; Ishii, Yasuyuki; Sato, Takahiro; Oikawa, Masakazu*; Okubo, Takeru; Haga, Junji*; Nishikawa, Hiroyuki*; Furuta, Yusuke*; Uchiya, Naoyuki*; et al.

Nuclear Instruments and Methods in Physics Research B, 267(12-13), p.2317 - 2320, 2009/06

 Times Cited Count:7 Percentile:47.19(Instruments & Instrumentation)

Oral presentation

Three-dimensional writing with ion microbeam

Takano, Katsuyoshi; Sato, Takahiro; Ishii, Yasuyuki; Kamiya, Tomihiro; Okubo, Takeru; Sugimoto, Masaki

no journal, , 

Three dimensional micromachining with proton beam writing has been developed at Japan Atomic Energy Agency (JAEA) Takasaki. For SU-8 negative-type photoresist films which is one of the candidate for the target, the proton microbeam writing with the incidence energy 3 MeV was performed to change the fluency from 0.03 to 0.27 $$mu$$C/mm$$^2$$. The use of the proton microbeam writing that the fluency is adjusted to 0.07$$mu$$C/mm$$^2$$ enables to fabricate the range of 550 $$times$$ 550 $$mu$$m$$^2$$ by the resolution of 1 $$mu$$m vertically against the incidence direction.

Oral presentation

Microfabrication using proton beam writing at JAEA-TIARA

Takano, Katsuyoshi; Sato, Takahiro; Ishii, Yasuyuki; Kamiya, Tomihiro; Okubo, Takeru; Sugimoto, Masaki; Nishikawa, Hiroyuki*; Seki, Shu*

no journal, , 

In TIARA facility of Japan Atomic Energy Agency (JAEA) Takasaki, microscopic bridge structures on silicon wafer substrate were produced with the proton beam writing, utilising a difference of projected range for SU-8 photoresist films between the incidence energy of 1 MeV and 3 MeV. The beam length of the brige structure was 50 $$mu$$m, and the distance between the beam and the substrate was 30 $$mu$$m.

Oral presentation

Recent test results on blanket module installation using in-vessel transporter for ITER

Aburadani, Atsushi; Takeda, Nobukazu; Kakudate, Satoshi; Kubo, Tomomi*; Sugimoto, Takeru*; Nakahira, Masataka*; Tesini, A.*

no journal, , 

no abstracts in English

Oral presentation

Development of 3D-micro-fabrication on polymer film by ion beam lithography

Takano, Katsuyoshi*; Seki, Shuhei*; Sato, Takahiro; Ishii, Yasuyuki; Okubo, Takeru; Koka, Masashi; Kada, Wataru; Kamiya, Tomihiro; Sugimoto, Masaki; Nishikawa, Hiroyuki*

no journal, , 

no abstracts in English

Oral presentation

Development of fabrication technique of optical devices using ion beam

Miura, Kenta*; Umenyi, A. V.*; Hanaizumi, Osamu*; Sato, Takahiro; Ishii, Yasuyuki; Okubo, Takeru; Yamazaki, Akiyoshi; Koka, Masashi; Yokoyama, Akihito; Kada, Wataru; et al.

no journal, , 

no abstracts in English

Oral presentation

Three dimensional nano-micro processing for polymer films by MeV ion beam lithography

Takano, Katsuyoshi*; Asano, Atsushi*; Maeyoshi, Yuta*; Marui, Hiromi*; Omichi, Masaaki*; Saeki, Akinori*; Seki, Shu*; Sato, Takahiro; Kamiya, Tomihiro; Ishii, Yasuyuki; et al.

no journal, , 

Oral presentation

Three dimensional microprocessing for polymer films by mev ion beam lithography

Takano, Katsuyoshi*; Asano, Atsushi*; Maeyoshi, Yuta*; Marui, Hiromi*; Omichi, Masaaki*; Saeki, Akinori*; Seki, Shuhei*; Sato, Takahiro; Ishii, Yasuyuki; Kamiya, Tomihiro; et al.

no journal, , 

Oral presentation

Fabrication of optical functional elements by ion beam

Miura, Kenta*; Kikuchi, Shusuke*; Kiryu, Hiromu*; Inada, Kazuki*; Ozawa, Yusuke*; Hanaizumi, Osamu*; Yamamoto, Shunya; Sugimoto, Masaki; Yoshikawa, Masahito; Kawaguchi, Kazuhiro; et al.

no journal, , 

no abstracts in English

Oral presentation

Development of fabrication technique of optical functional devices by ion beam irradiation

Miura, Kenta*; Hanaizumi, Osamu*; Kada, Wataru*; Ozawa, Yusuke*; Inada, Kazuki*; Kubota, Atsushi*; Kawashima, Akihiro*; Sato, Takahiro; Ishii, Yasuyuki; Koka, Masashi; et al.

no journal, , 

no abstracts in English

Oral presentation

Nuclear spin conversion of methane in condensed layers at low temperatures

Yamakawa, Koichiro; Sugimoto, Takeru*

no journal, , 

Methane has three kinds of nuclear spin isomers: ortho (I = 1), meta (I = 2), and para (I = 0). Methane is a spherical top molecule, and its rotational energy is dependent on the rotational quantum number J. The J = 0 (J = 1) level is occupied only by the meta (ortho) isomer while the ortho and para states are degenerate at the J = 2 level. Because of this degeneracy, the conversion between ortho and para proceeds considerably fast, with the result that only the ortho-meta conversion has been observed in matrices of rare gases and para hydrogen. On the other hand, the nuclear spin conversion between three kinds of the isomers has recently been observed in the lower-temperature phase of crystalline methane. In this presentation, the infrared spectroscopic study on the ortho-meta-para conversion in crystalline methane is demonstrated, comparing with previous matrix-isolation studies.

18 (Records 1-18 displayed on this page)
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