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Taira, Yoshitaka*; Endo, Shunsuke; Kawamura, Shiori*; Nambu, Taro*; Okuizumi, Mao*; Shizuma, Toshiyuki*; Omer, M.; Zen, H.*; Okano, Yasuaki*; Kitaguchi, Masaaki*
Physical Review A, 107(6), p.063503_1 - 063503_10, 2023/06
Times Cited Count：0 Percentile：0.01(Optics)no abstracts in English
Kirihara, Yoichi; Nakashima, Hiroshi; Sanami, Toshiya*; Namito, Yoshihito*; Itoga, Toshiro*; Miyamoto, Shuji*; Takemoto, Akinori*; Yamaguchi, Masashi*; Asano, Yoshihiro*
Journal of Nuclear Science and Technology, 57(4), p.444 - 456, 2020/04
Times Cited Count：7 Percentile：61.94(Nuclear Science & Technology)no abstracts in English
Sekiguchi, Tetsuhiro; Baba, Yuji; Hirao, Norie; Honda, Mitsunori; Izumi, Toshinori; Ikeura, Hiromi*
Molecular Crystals and Liquid Crystals, 622(1), p.44 - 49, 2015/12
Times Cited Count：0 Percentile：0.01(Chemistry, Multidisciplinary)The molecular orientation is one of the important factors for controlling various properties in organic semiconductor materials. Films are usually heterogeneous. Thus they exist as a mixture of microscopic domains which have a variety of orientation directions. Therefore, it is essential to observe selectively microscopic domains with different orientation direction. In this work, we have developed the photoelectron emission microscopy (PEEM) system combined with the linearly polarized vacuum ultraviolet (VUV) light or synchrotron radiation (SR) X-rays. PEEM images (FOV = ca.50 micro m) for poly(3-hexylthiophene), P3HT thin films were observed under the UV irradiation with various polarization angles, including in-plain and out-of-plain polarization. Morphologies at some bright parts are different each other. The resultant observation suggests that it enables us to distinguish oriented micro-domains with specific directions of polymer chain axis from other amorphous parts.
Janulewicz, K. A.*; Kim, C. M.*; Steil, H.*; Kawachi, Tetsuya; Nishikino, Masaharu; Hasegawa, Noboru
X-Ray Lasers and Coherent X-Ray Sources; Development and Applications XI (Proceedings of SPIE, Vol.9589), p.95890N_1 - 95890N_7, 2015/09
Times Cited Count：0 Percentile：0(Optics)We describe measurement results on the polarization state of amplified spontaneous emission signal from a collisionally pumped Ni-like Ag soft X-ray laser with a transient inversion. The result obtained with a calibrated membrane beam splitter as a polarization state (P-state) selector shows that dominance one of the mutually perpendicular electric field components (p- or s-) in the output signal depends on the hydrodynamic state of the plasma medium. Two different hydrodynamic states were referred as a low gain and high gain regimes and the allocated P-states had dominant s- and p-component, respectively. It was also shown that due to correlations between p- and s-components in the process of coherent amplification of noise, correct description of the polarization state requires applying the generalized theory of polarization and formulated there the generalized degree of polarization.
Shimoyama, Iwao; Baba, Yuji; Sekiguchi, Tetsuhiro
DV-X
Kenkyu Kyokai Kaiho, 27(1&2), p.34 - 44, 2015/03
no abstracts in English
Sekiguchi, Tetsuhiro; Baba, Yuji; Shimoyama, Iwao; Hirao, Norie; Honda, Mitsunori; Izumi, Toshinori; Ikeura, Hiromi*
Photon Factory Activity Report 2013, Part B, P. 546, 2014/00
The molecular orientation is one of the important factors for controlling various properties in organic semiconductor materials. Films are usually heterogeneous. Thus they exist as a mixture of microscopic domains which have a variety of orientation directions. Therefore, it is essential to observe selectively microscopic domains with different orientation direction. In this work, we have developed the photoelectron emission microscope (PEEM) system combined with the linearly polarized vacuum ultraviolet (VUV) light or synchrotron radiation (SR) X-rays. PEEM images for poly(3-hexylthiophene), P3HT thin films were observed under synchrotron X-ray irradiation with linearly polarization. In conclusion, it was found that PEEM with polarized synchrotron can be a powerful tool that gives information of molecular orientation in nano-meter scale.
Ikeura, Hiromi*; Sekiguchi, Tetsuhiro
Photon Factory Activity Report 2013, Part B, P. 518, 2014/00
Organic electrically conducting 
-stacked small molecules are widely regarded as promising materials for future application of low-cost and flexible nanoelectronics. Pentacene is one of the most promising organic semiconductors because of its excellent device performance. Direct measurements of electronic structures of unoccupied states of organic semiconductors lead to better understanding of mechanism of electron conduction. For probing unoccupied partial density of states (DOS), X-ray absorption spectroscopy (XAS) is commonly used, where selective excitation of the 1s core electron to the unoccupied conduction band is possible. The molecular orientation of pentacene derivative has been investigated by angle dependent XAS measurements. Electronic states were calculated by DVX method.
Miura, Yukitoshi
Hikari Kagaku Kenkyu No Saizensen, p.142 - 143, 2005/08
no abstracts in English
Agui, Akane; Mizumaki, Masaichiro*; Matsushita, Tomohiro*; Kawamura, Naomi*; Nakatani, Takeshi
Physica Scripta, T115, p.611 - 613, 2005/00
no abstracts in English
Tanaka, Masahito*; Nakagawa, Kazumichi*; Agui, Akane; Fujii, Kentaro; Yokoya, Akinari
Physica Scripta, T115, p.873 - 876, 2005/00
no abstracts in English
Nakatani, Takeshi; Agui, Akane; Yoshigoe, Akitaka; Matsushita, Tomohiro*; Takao, Masaru*; Takeuchi, Masao*; Aoyagi, Hideki*; Tanaka, Hitoshi*
JAERI-Tech 2004-013, 16 Pages, 2004/12
JAERI-Tech-2004-013.pdf:3.55MB
We observed two characteristic electron orbit fluctuations caused when the phase of ID23 (APPLE-2 type undulator) installed at SPring-8 was driven. One was caused by the variation of magnetic error filed of ID23 when the phase was driven. The other was caused by the noise from the phase drive system which adoped AC servomotors. We measured these orbit fluctuations synchronized with the phase motion using the real-time electron beam position measurement system. The part of the orbit fluctuation was supressed by the correction table which was made referring to the obtained data.
-BN thin film on Ni(111) using NEXAFS spectroscopyShimoyama, Iwao; Baba, Yuji; Sekiguchi, Tetsuhiro; Nath, K. G.
Hyomen Kagaku, 25(9), p.555 - 561, 2004/09
no abstracts in English
Shimoyama, Iwao; Baba, Yuji; Sekiguchi, Tetsuhiro; Nath, K. G.
Journal of Electron Spectroscopy and Related Phenomena, 137-140, p.573 - 578, 2004/07
Times Cited Count：27 Percentile：72.98(Spectroscopy)Hexagonal boron nitride (h-BN) thin film has been epitaxially formed on Ni(111) by chemical vapor deposition using borazine gas. The electronic structure of this system is studied by near edge X-ray absorption fine structure (NEXAFS) spectroscopy and X-ray photoelectron spectroscopy (XPS). The thickness of the h-BN is estimated to be about two-layers from XPS. B K-edge NEXAFS spectra show new * peak which is not observed in the spectrum for bulk h-BN. From a polarization dependence analysis of NEXAFS, we propose this new * peak originates from the interaction between the h-BN and Ni(111). This new * peak clearly proves that conduction band of h-BN/Ni(111) is different from that of bulk h-BN.
Agui, Akane; Mizumaki, Masaichiro*; Matsushita, Tomohiro*; Asahi, Toru*; Kawaji, Jun*; Sayama, Junichi*; Osaka, Tetsuya*
Journal of Applied Physics, 95(12), p.7825 - 7831, 2004/06
Times Cited Count：6 Percentile：27.83(Physics, Applied)The electronic and spin states of [Co/Pd] multilayered perpendicular magnetization films with various seedlayers have been investigated by means of soft X-ray absorption and magnetic circular dichroism spectroscopy at the Co 
-edges. The expectation values of the orbital angular momentum 
and the spin angular momentum 
of Co atom in the [Co/Pd] multilayered film were estimated using the sum rule. It was found that the seedlayer changes macroscopic magnetic properties of the [Co/Pd] multilayered film without affecting the electronic and spin states of the upper layers of Co.
Kim, J.*; Kim, D. E.*; Kawachi, Tetsuya; Hasegawa, Noboru; Sukegawa, Kota*; Iwamae, Atsushi*; Fujimoto, Takashi*
Journal of the Optical Society of Korea, 7(3), p.145 - 149, 2003/09
The anistropy of electron energy distribution in oxygen plasmas produced by a high intensinty laser was investigated by using polarization spectroscopy. An ultra-short pulsed laser with a pulse duration of 66.5 fs and a power density of 1
10
W/cm
was used. At this power density and pulse duration, the plasma was generated predominantly by optical field ionization. The degree of polarization of OVI 1s2p P-1s4d D
(J=1/2-3/2 and J=3/2-5/2) transition line at 129.92 
の1s 2pP-1s4sS (J=1/2-1/2 and J=3/2-1/2) transition line at 132.26 AA was used to calibrate the sensitivity of the optical system. The dependencies of the degree of polarization on the initial gas density and on the laser polarization were investigated. When the laser polarization was changed from a linear to a circlar polarization was decreased. When the initial gas density was increased, the degree of polarization was decreased.
Kawano, Yasunori; Chiba, Shinichi; Inoue, Akira*
Proceedings of 30th EPS Conference on Controlled Fusion and Plasma Physics (CD-ROM), 4 Pages, 2003/00
It has been successful to apply CVD diamond plate as the vacuum window for infrared CO
laser interferometry and polarimetry for electron density measurement in the JT-60U tokamak. In comparison with using the conventional zinc-selenide windows, the Faraday rotation component at diamond windows was small as negligible. This resulted in the improvement of the Faraday rotation measurement for a tokamak plasma by polarimetry.
Agui, Akane; Yoshigoe, Akitaka; Nakatani, Takeshi; Fujii, Kentaro; Yokoya, Akinari
JAERI-Tech 2002-064, 57 Pages, 2002/08
JAERI-Tech-2002-064.pdf:7.47MB
no abstracts in English
Shimoyama, Iwao
Hoshako, 15(1), p.12 - 19, 2002/01
Since the prediction of the possibility that carbon nitride would have super hard property which exceeds that of diamond, considerable efforts to synthesize this material have been employed. However, local structures in carbon nitride films synthesized have not been revealed enough. We study the local structures utilizing synchrotron radiation and revealed the existence of three kinds of local structures in carbon nitride films, i.e., cyanic structure which has C≡N triple bond, pyridine-like structure which has C=N double bond, and graphite-like structure in which carbon atom is substituted by nitrogen atom in graphite network. In this article, I explain the method of near edge X-ray absorption fine structure (NEXAFS) that we used for this study, and from the comparison with X-ray photoelectron spectroscopy (XPS), I comment the availability of NEXAFS to study the local structures in new materials.
Agui, Akane; Yoshigoe, Akitaka; Nakatani, Takeshi; Matsushita, Tomohiro*; Saito, Yuji; Mizumaki, Masaichiro*; Yokoya, Akinari; Tanaka, Hitoshi*; Miyahara, Yoshikazu*; Shimada, Taihei; et al.
Hoshako, 14(5), p.339 - 348, 2001/11
no abstracts in English
Yoneda, Yasuhiro; Matsumoto, Norimasa; Furukawa, Yukito*; Ishikawa, Tetsuya*
Journal of Synchrotron Radiation, 8(1), p.18 - 21, 2001/08
Times Cited Count：41 Percentile：85.19(Instruments & Instrumentation)no abstracts in English
