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Journal Articles

Devil's staircase transition of the electronic structures in CeSb

Kuroda, Kenta*; Arai, Yosuke*; Rezaei, N.*; Kunisada, So*; Sakuragi, Shunsuke*; Alaei, M.*; Kinoshita, Yuto*; Bareille, C.*; Noguchi, Ryo*; Nakayama, Mitsuhiro*; et al.

Nature Communications (Internet), 11, p.2888_1 - 2888_9, 2020/06

 Times Cited Count:9 Percentile:68.19(Multidisciplinary Sciences)

Journal Articles

Neutron scattering studies on short- and long-range layer structures and related dynamics in imidazolium-based ionic liquids

Nemoto, Fumiya*; Kofu, Maiko; Nagao, Michihiro*; Oishi, Kazuki*; Takata, Shinichi; Suzuki, Junichi*; Yamada, Takeshi*; Shibata, Kaoru; Ueki, Takeshi*; Kitazawa, Yuzo*; et al.

Journal of Chemical Physics, 149(5), p.054502_1 - 054502_11, 2018/08

 Times Cited Count:14 Percentile:68.72(Chemistry, Physical)

Journal Articles

Studies of high density baryon matter with high intensity heavy-ion beams at J-PARC

Sako, Hiroyuki; Harada, Hiroyuki; Sakaguchi, Takao*; Chujo, Tatsuya*; Esumi, Shinichi*; Gunji, Taku*; Hasegawa, Shoichi; Hwang, S.; Ichikawa, Yudai; Imai, Kenichi; et al.

Nuclear Physics A, 956, p.850 - 853, 2016/12

 Times Cited Count:11 Percentile:68.22(Physics, Nuclear)

Journal Articles

Formation of fullerene(C$$_{60}$$) by laser ablation in superfluid helium at 1.5K

Aratono, Yasuyuki; Wada, Akira*; Akiyama, Kazuhiko; Kitazawa, Shinichi; Hojo, Kiichi; Naramoto, Hiroshi*

Chemical Physics Letters, 408(4-6), p.247 - 251, 2005/06

 Times Cited Count:1 Percentile:3.11(Chemistry, Physical)

C$$_{60}$$ fulleren was detected in the deposit produced by the laser ablation in superfluid helium at 1.5K. From the mass spectrometry, it was found that the ratio, $$^{12}$$C$$_{60}$$/$$^{12}$$C$$_{59}$$$$^{13}$$C, differs from statistical one calculated by Poisson distribution for natural graphite. Assuming the recombination of atomic carbons to C$$_{2}$$ molecules as an initial stage for C$$_{60}$$ formation, the different isotopic ratio of C$$_{60}$$ from Poisson statistics was ascribed to the tunneling recombination between $$^{12}$$C and $$^{13}$$C atoms in the bubble state.

Journal Articles

Laser induced phase separation in the nickel-fullerene nano-composite

Vacik, J.*; Naramoto, Hiroshi; Kitazawa, Shinichi; Yamamoto, Shunya; Juha, L.*

Journal of Physics and Chemistry of Solids, 66(2-4), p.581 - 584, 2005/02

 Times Cited Count:5 Percentile:26.91(Chemistry, Multidisciplinary)

no abstracts in English

Journal Articles

${it In-situ}$ optical spectroscopy of ablation plume for preparations of nanostructured TiO$$_{2}$$ thin films by pulsed laser deposition

Kitazawa, Shinichi

Japanese Journal of Applied Physics, Part 1, 43(9A), p.6335 - 6341, 2004/09

 Times Cited Count:16 Percentile:54.33(Physics, Applied)

Nanostructured TiO$$_{2}$$ thin films on $$alpha$$-Al$$_{2}$$O$$_{3}$$ (0001) substrates prepared by pulsed laser deposition (PLD) were analyzed and evaluated in terms of the buffer O$$_{2}$$ gas pressure (0 - 80 Pa) dependencies by optical spectroscopy and surface morphology. Optical emission spectra of the ablation plume from Ti and TiO$$_{2}$$ targets were measured in-situ. The contribution from TiO molecules was observed by narrow-band photometry. The surface morphology was observed by an atomic force microscope (AFM), revealing the pressure dependence of nanostructures. The crystallographic structures of prepared TiO$$_{2}$$ thin films were observed by X-ray diffraction (XRD). The optically observed band-gaps of the prepared thin films show that the crystallographic structures are mixed crystals of rutile and anatase. Evaporated Ti particles combine with buffer O$$_{2}$$ gas thereby producing TiO molecules, which affect the formation of nanostructures on TiO$$_{2}$$ thin films.

Journal Articles

Optical spectroscopy of plasma plume induced by pulsed laser deposition of TiO$$_{2}$$ thin films

Kitazawa, Shinichi; Yamamoto, Shunya

Transactions of the Materials Research Society of Japan, 28(4), p.1133 - 1136, 2003/12

The epitaxial growth of high quality TiO$$_{2}$$ films has attracted much interest from the viewpoints of basic science and applications. In the synthesis process of TiO$$_{2}$$ films, the pulsed laser deposition (PLD) method is widely employed because of its advantage for materials with high melting point. The laser irradiation generates plasmas from Ti bulk targets, and the evaporated Ti particles have interactions with buffer dioxide gas before/after the epitaxial growth. We observed the optical emission spectra from the plumes generated by laser ablation in order to improve on the epitaxial growth under proper conditions. The spectra show dependences of energy densities and wavelengths of the laser. The spectra are investigated for relevancies to the quality of films and crystallographic relationships that were assessed by x-ray diffraction, x-ray pole figures and Rutherford backscattering spectroscopy.

Journal Articles

Formation of nano-sized pinholes array in thin Ni film on MgO(100) substrate

Lin, C.; Naramoto, Hiroshi; Xu, Y.; Kitazawa, Shinichi; Narumi, Kazumasa; Sakai, Seiji

Thin Solid Films, 443(1-2), p.28 - 32, 2003/10

 Times Cited Count:1 Percentile:8.77(Materials Science, Multidisciplinary)

no abstracts in English

Journal Articles

Laser detection of surface acoustic waves as a method of measuring an Ar ion beam modification of carbon thin film

Kitazawa, Shinichi; Putra, P.; Sakai, Seiji; Narumi, Kazumasa; Naramoto, Hiroshi; Yamamoto, Shunya; Chiba, Atsuya

Nuclear Instruments and Methods in Physics Research B, 206, p.952 - 955, 2003/05

 Times Cited Count:6 Percentile:43.67(Instruments & Instrumentation)

Pulsed energy impacts are expected to generate the elastic waves reflecting the elastic properties of impacted substances. Among the generated waves, the surface acoustic waves (SAW) can be more specific to the surface structures and can be used effectively in the characterization of thin films in a non-destructive way. In the present study, pulsed laser impacts were employed to generate SAWs on a thin film and the SAWs are detected with a laser reflection technique. To test the effectiveness of this method, an amorphous carbon films were irradiated with 13 keV Ar ions at room temperature in a broad range and the SAW propagation velocity was evaluated as a function of Ar ion dose. The present preliminary experiment using pulsed laser suggests the successful detection of SAW from typical substances with different modulus of elasticity such as fcc metals, oxides and semi conducting materials.

Journal Articles

Morphology evolution of thin Ni film on MgO(100) substrate

Lin, C.; Xu, Y. H.; Naramoto, Hiroshi; Wei, P.; Kitazawa, Shinichi; Narumi, Kazumasa

Journal of Physics D; Applied Physics, 35(15), p.1864 - 1866, 2002/08

 Times Cited Count:10 Percentile:41.71(Physics, Applied)

no abstracts in English

Journal Articles

Angular momentum distributions of Rydberg state electrons of Be-like sulfur produced through foil penetration

Imai, Makoto*; Sataka, Masao; Kitazawa, Shinichi; Komaki, Kenichiro*; Kawatsura, Kiyoshi*; Shibata, Hiromi*; Tawara, Hiroyuki*; Azuma, Toshiyuki*; Kanai, Yasuyuki*; Yamazaki, Y.*

Nuclear Instruments and Methods in Physics Research B, 193(1-4), p.674 - 679, 2002/06

 Times Cited Count:5 Percentile:35.61(Instruments & Instrumentation)

no abstracts in English

Journal Articles

Electronic excitation effects on secondary ion emission from a foil of conducting material bombarded by high energy heavy ions

Sekioka, T.*; Terasawa, Michitaka*; Sataka, Masao; Kitazawa, Shinichi; Niibe, M.*

Nuclear Instruments and Methods in Physics Research B, 193(1-4), p.751 - 754, 2002/01

 Times Cited Count:2 Percentile:19.55(Instruments & Instrumentation)

no abstracts in English

Journal Articles

Electron spectroscopy of doubly excited states in He produced by slow collisions of He$$^{2+}$$ ions with Ba atoms

Iemura, K.*; Otani, Shunsuke*; Suzuki, H.*; Takeda, Junichi*; Machida, Shuichi*; Tanabe, K.*; Takayanagi, Toshinobu*; Wakiya, K.*; Sekiguchi, M.*; Kanai, Yasuyuki*; et al.

Physical Review A, 64(6), p.062709_1 - 062709_14, 2001/12

 Times Cited Count:6 Percentile:36.27(Optics)

We measured ejected electron spectra caused by autoionization of doubly excited states in He atoms; the excited He was made by double electron capture of low-energy He$$^{2+}$$ ions colliding with Ba atoms. Measurements were performed by means of zero degree electron spectroscopy at projectile energies from 40 to 20 keV. Electron spectra due to autoionization from the states He(2lnl) to He+(1s) for n$$geq$$2, and those from He(3lnl) to He$$^+$$(2s or 2p) for n$$geq$$3, were observed. Line peaks in the spectra were identified by comparing observed electron spectra with those of several theoretical calculations. It was found that doubly excited states of relatively high angular momenta such as the D and F terms were conspicuously created in a quite different manner from the cases of the production of doubly excited states by the use of photon, electron, or ion impacts on neutral He atoms. Rydberg states with large n values were observed with high population in both the He(2lnl) and He(3lnl) series.

Journal Articles

Electron spectrra from singlet and triplet states of Ne$$^{6+**}$$ produced by low energy Ne$$^{8+}$$+He, Ne and Ar collisions

Kitazawa, Shinichi; Ida, H.*; Matsui, Y.*; Takayanagi, Toshinobu*; Wakiya, K.*; Iemura, K.*; Otani, Shunsuke*; Suzuki, H.*; Kanai, Yasuyuki*; Safronova, U. I.*

Journal of Physics B; Atomic, Molecular and Optical Physics, 34(16), p.3205 - 3220, 2001/08

 Times Cited Count:5 Percentile:31.79(Optics)

no abstracts in English

JAEA Reports

Development of eddy current techniques at PIE facility; phase II testing for FCCI measurement

Kikuchi, Shin; Kitazawa, Takeo; ; Matsumoto, Shinichiro

JNC TN9410 2001-003, 84 Pages, 2000/07

JNC-TN9410-2001-003.pdf:2.12MB

Eddy current techniques have been tested for future Post irradiated Experiment ;PIE applications outside hot cell(the following, cell outside). As the result, applicability to the defects inspection such as the cladding tube material was able to be confirmed, and an outlook to the application to the irradiation material was obtained. The last time, report described results of the external surface defects, inside defects, and open holes outside hot cell except for Fuel-Cladding Chemical Interaction (FCCI) measurement testing This paper mainly describes the results of the trial FCCI measurement testing outside hot cell. Other tests include the results of external surface defects, inside defects, and open holes in the proofreading tests. The proofreading tests used a standard defect pin inside hot cell. In the trial FCCI measurement testing outside hot cell, the correlation between reduction in thickness and eddy current signal value was comfirmed, and the prospect of FCCI measurement by the eddy current testing was examined. As the result, the optimum conditions for measuring the FCCI quantity are respectively (1)carrier speed of the pin :20mm/sec, (2) test frequency : 32kHz, (3)phase : ODEG, (4) gain :-10dB, (5)filter : 0. The correlation between trial FCCI quantity and eddy current signal value was found on the basis of the test result, and the prospect which could detect FCCI was obtained when there is reduction in thickness of over 50 $$mu$$m for the cladding tube with wall thickness quantity of the 300 $$mu$$m order. And, the proofreading test inside hot cell on eddy current measurements were confirmed to be equivalent to the performance test outside hot cell.

Journal Articles

Production of doubly excited He atoms in collisions of He$$^{2+}$$ ions with aklaline-earth atoms

Iemura, K.*; Suzuki, H.*; Otani, Shunsuke*; Takeda, Junichi*; Takayanagi, Toshinobu*; Wakiya, K.*; Sekiguchi, M.*; Kanai, Yasuyuki*; Kitazawa, Shinichi; Tong, X. M.*; et al.

Atomic Collision Research in Japan, No.25, p.42 - 43, 1999/11

no abstracts in English

Journal Articles

Ejected electron spectra from highly charged oxygen ions in collisions with foils and gas atoms

Kitazawa, Shinichi; Sataka, Masao; Tawara, Hiroyuki*; Imai, Makoto*; Shibata, Hiromi*; Komaki, Kenichiro*; Azuma, Toshiyuki*; Kawatsura, Kiyoshi*; Kanai, Yasuyuki*

Atomic Collision Research in Japan, No.25, p.65 - 67, 1999/00

no abstracts in English

Journal Articles

Double-electron excited singlet and triplet Be-like ions produced by slow He-like ion-atom collisions

Kitazawa, Shinichi; *; *; *; Machida, Shuichi*; *; Wakiya, K.*; *; F.Currel*; *; et al.

Atomic Collision Research in Japan, (24), p.70 - 72, 1998/00

no abstracts in English

Journal Articles

Electron spectra from singlet and triplet states of N$$^{3+}$$(1s$$^{2}$$3l3l',1s$$^{2}$$3l4l') produced by low energy N$$^{5+}$$+He, Ne and Ar collisions

Kitazawa, Shinichi; *; Machida, Shuichi*; Matsui, Y.*; Ida, H.*; *; Wakiya, K.*; *; F.Currell*; *; et al.

Journal of Physics B; Atomic, Molecular and Optical Physics, 31(14), p.3233 - 3243, 1998/00

 Times Cited Count:9 Percentile:48.21(Optics)

no abstracts in English

Journal Articles

Reports of satelite meeting of the 20th ICPEAC; 15th int. seminar on ion-atom collisions

Kitazawa, Shinichi

Genshi Shototsu Sakyura, (174), p.12 - 14, 1997/09

no abstracts in English

29 (Records 1-20 displayed on this page)