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Journal Articles

Demonstration of the high collection efficiency of a broadband Mo/Si multilayer mirror with a graded multilayer coating on an ellipsoidal substrate

Ichimaru, Satoshi*; Takenaka, Hisataka*; Namikawa, Kazumichi*; Gullikson, E. M.*; Maruyama, Momoko; Oku, Satoshi*

Review of Scientific Instruments, 86(9), p.093106_1 - 093106_7, 2015/09

 Times Cited Count:3 Percentile:80.02(Instruments & Instrumentation)

A graded and broadband Mo/Si multilayer mirror for EUV spectroscopy is demonstrated. This mirror has an average reflectivity profile of 16% in the wavelength region from 15 nm to 17 nm and an effective area of 1100 - 1500 mm$$^{2}$$. This reflectivity is about 4 times larger than that of a standard Mo/Si multilayer mirror on a 1 in. diameter substrate, showing that the mirror can be used for measuring EUV fluorescence at wavelengths in the region around 15 nm to 17 nm.

Journal Articles

Development of soft X-ray multilayer laminar-type plane gratings and varied-line-spacing spherical grating for flat-field spectrograph in the 1-8 keV region

Koike, Masato; Ishino, Masahiko; Imazono, Takashi; Sano, Kazuo*; Sasai, Hiroyuki*; Hatayama, Masatoshi*; Takenaka, Hisataka*; Heimann, P. A.*; Gullikson, E. M.*

Spectrochimica Acta, Part B, 64(8), p.756 - 760, 2009/08

 Times Cited Count:9 Percentile:53.27(Spectroscopy)

W/C and Co/SiO$$_{2}$$ multilayer laminar-type holographic plane gratings (groove density 1/1200 lines /mm) in the 1-8 keV region are developed. For the Co/SiO$$_{2}$$ grating the diffraction efficiencies of 0.41 and 0.47 at 4 and 6 keV, respectively, and for the W/C grating 0.38 at 8 keV are observed. Taking advantage of the outstanding high diffraction efficiencies into practical soft X-ray spectrographs a Mo/SiO$$_{2}$$ multilayer varied-line-spacing (VLS) laminar-type spherical grating (1/2400 lines /mm) is also developed for use with a flat field spectrograph in the region of 1.7 keV. For the Mo/SiO$$_{2}$$ multilayer grating the diffraction efficiencies of 0.05-0.20 at 0.9-1.8 keV are observed. The FWHM's of the measured line profiles of Hf-M$$alpha$$$$_{1}$$ (1644.6 eV), Si-K$$alpha$$$$_{1}$$ (1740.0 eV),and W-M$$alpha$$$$_{1}$$ (1775.4 eV) are 13.7 eV, 8.0 eV, and 8.7 eV, respectively. It shows the validity of multilayer lamina-type gratings in the region.

Journal Articles

Fabrication and evaluation of a multilayer laminar-type holographic grating and its application to a high efficiency grazing incidence monochromator for the 1-8 keV region

Koike, Masato; Ishino, Masahiko; Heimann, P. A.*; Imazono, Takashi; Takenaka, Hisataka*; Hatayama, Masatoshi*; Sasai, Hiroyuki*; Gullikson, E. M.*; Sano, Kazuo*

AIP Conference Proceedings 879, p.647 - 650, 2007/01

no abstracts in English

Journal Articles

Development of multilayer laminar-type diffraction gratings to achieve high diffraction efficiencies in the 1-8 keV energy region

Ishino, Masahiko; Heimann, P. A.*; Sasai, Hiroyuki*; Hatayama, Masatoshi*; Takenaka, Hisataka*; Sano, Kazuo*; Gullikson, E. M.*; Koike, Masato

Applied Optics, 45(26), p.6741 - 6745, 2006/09

 Times Cited Count:11 Percentile:50.37(Optics)

no abstracts in English

Journal Articles

Characterization of surface carbon films on weathered Japanese roof tiles by soft X-ray spectroscopy

Muramatsu, Yasuji; Yamashita, Michiru*; Motoyama, Muneyuki*; Hirose, Mika*; Denlinger, J. D.*; Gullikson, E. M.*; Perera, R. C. C.*

X-Ray Spectrometry, 34(6), p.509 - 513, 2005/11

 Times Cited Count:0 Percentile:100(Spectroscopy)

Surface carbon films on the weathered Japanese roof tiles were characterized by soft X-ray spectroscopy. From the X-ray absorption measurements, it was confirmed that the surface carbon films were oxidized by weathering. On the ohterhand, from the X-ray emission measurements, it can be confirmed that the degree of the orientation was kept in the inner carbon films.

Journal Articles

Evaluation of carbon films on the Japanese smoked roof tile "Ibushi-Kawara" by angle-dependent soft X-ray emission spectroscopy using synchrotron radiation

Muramatsu, Yasuji; Yamashita, Michiru*; Motoyama, Muneyuki*; Denlinger, J. D.*; Gullikson, E. M.*; Perera, R. C. C.*

Spectrochimica Acta, Part B, 59(8), p.1317 - 1322, 2004/08

 Times Cited Count:2 Percentile:89.24(Spectroscopy)

Polarized emission spectra from graphite have been measured by an EPMA and discussed by means of molecular orbital calculation of 2p electrons densities of state of graphite by some of the present authors. The present study treats the refined measurements of the polarized C K-emission band spectra from the highly oriented pyrolytic graphite (HOPG) and discusses the structure of the surface carbons of Japanese traditional smoked roof tiles, Ibushi Kawara.

Journal Articles

First principles study of core-hole effect on fluorine K-edge X-ray absorption spectra of MgF$$_{2}$$ and ZnF$$_{2}$$

Yamamoto, Tomoyuki*; Mizoguchi, Teruyasu*; Tatsumi, Kazuyoshi*; Tanaka, Isao*; Adachi, Hirohiko*; Muramatsu, Yasuji; Gullikson, E. M.*; Perera, R. C. C.*

Materials Transactions, 45(7), p.1991 - 1993, 2004/07

 Times Cited Count:5 Percentile:60.8(Materials Science, Multidisciplinary)

First principles calculations have been carried out to investigate the core-hole effects on the theoretical fine structures of the X-ray absorption spectra of MgF$$_{2}$$ and ZnF$$_{2}$$ ath FK-edge. Experimental profiles of the near-edge X-ray absorption fine structures are well reproduced by the theoretical calculations when the core-hole effect is introduced. The dependence of supercell size on the theoretical fine structures is also examined.

Journal Articles

Soft X-ray emission and absorption spectra of typical solid carbon compounds

Muramatsu, Yasuji; Gullikson, E. M.*; Perera, R. C. C.*

X-sen Bunseki No Shimpo, 35, p.125 - 136, 2004/00

Soft X-ray emission and absorption spectra in the CK region of typical solid carbon compounds (HOPG, carbon nanotube, diamond, fullerene, polyethylene, ${it p}$-terphenyl, anthracene) are demonstrated. Take-off/incident-angle dependent X-ray spectra of HOPG are also shown to utilize for the structural analysis of anistropic crystals. Spectral analysis of these compounds using discrete variational (DV)-X$$alpha$$ molecular orbital calclations is also demonstrated.

Journal Articles

Characterization of carbon films on the Japanese smoked roof tile "Ibushi-Kawara" by high-resolution soft X-ray spectroscopy

Muramatsu, Yasuji; Motoyama, Muneyuki*; Denlinger, J. D.*; Gullikson, E. M.*; Perera, R. C. C.*

Japanese Journal of Applied Physics, Part 1, 42(10), p.6551 - 6555, 2003/10

 Times Cited Count:5 Percentile:74.5(Physics, Applied)

Carbon films on Japanese smoked roof tile "Ibushi-Kawara" were characterized by high-resolution soft X-ray spectroscopy using synchrotron radiation. By comparing the soft X-ray emission and absorption spectra of Kawara with the reference carbon compounds, it was determined that the carbon films on Kawara consist of mostly carbon-black-like sp2 carbon atoms and that the surface also contains polyethylene-like sp3 carbon atoms. The take-off/incident-angle dependence on the X-ray emission/absorption spectra of Kawara implies that the carbon-black-like sp2 carbon atoms partially form a layer structure parallel to the basal clay plane. From the take-off-angle dependence of the p/s-peak intensity ratio in the X-ray emission spectra, the layer ordering of the carbon films is estimated to be 50% of highly oriented pyrolytic graphite (HOPG). Therefore, the metallic oxidized color and durability are due to the layer structure and the random structure that connects the layer-structured clusters, respectively.

Journal Articles

Angle-resolved soft X-ray emission and absorption spectroscopy of hexagonal boron nitride

Muramatsu, Yasuji; Kaneyoshi, Takahiro*; Gullikson, E. M.*; Perera, R. C. C.*

Spectrochimica Acta, Part A, 59(9), p.1951 - 1957, 2003/07

Angle-resolved soft X-ray emission and absorption spectra in the BK and NK regions of hexagonal BN were measured using polarized synchrotron radiation. The take-off/incident-angle-dependence on the spectral features in both X-ray emission and absorption is clearly observed. The configuration of the s and p orbitals, which were calculated using discrete variaional (DV) -Xa molecular orbital calculations, explains the angle-resolved soft X-ray emission and absorption spectra. The relative peak intensity of the 394-eV peak in the NK X-ray emission provides useful information about the BN layer ordering.

Journal Articles

Performance of laminar-type holographic grating for a soft X-ray flat field spectrograph in the 0.7-6 nm region

Koike, Masato; Sano, Kazuo*; Gullikson, E. M.*; Harada, Yoshihisa*; Kumata, Hideki*

Review of Scientific Instruments, 74(2), p.1156 - 1158, 2003/02

 Times Cited Count:20 Percentile:29.59(Instruments & Instrumentation)

Laminar-type holographic grating having a groove density of 2400 lines/mm was designed and fabricated for use with a soft X-ray flat field spectrograph covering the 0.7-6 nm region. The varied-line-spaced grating pattern was generated by use of an aspheric wave-front recording system and the laminar-type grooves were formed by a reactive ion-etching method. The performance of the grating was evaluated by using a molybdenum K X-ray generator and a spectrograph with a CCD imaging detector. Also the absolute diffraction efficiencies of 0th, 1st, 2nd, and 3rd spectral orders were measured by use of the reflectometers installed at synchrotron radiation beamlines. The experimental results showed that the holographic grating indicated comparable spectral resolution and maximum first-order diffraction efficiency ($$>$$2%) at $$sim$$2 nm with a replica grating made from a mechanically ruled varied-line-spacing grating, and it also showed higher efficiency in $$<$$1.0nm region and lower level higher order light over the whole wavelength range than the replica grating.

Journal Articles

Take-off/incident-angle-dependence of $$pi$$/$$sigma$$ peak intensity ratio in soft X-ray emission and absorption spectra of graphite and hexagonal boron nitride

Muramatsu, Yasuji; Gullikson, E. M.*; Perera, R. C. C.*

X-sen Bunseki No Shimpo, 34, p.153 - 163, 2003/00

Take-off/incident-angle-resolved soft X-ray emission and absorption spectra of highly oriented pyrolytic graphite (HOPG) and hexagonal boron nitride (h-BN) are measured by using polarized synchrotron radiation. The angle-dependent $$pi$$/$$sigma$$ peak intensity ratio can be explained by the configuration of $$pi$$- and $$sigma$$-orbitals, which provides the information of layer ordering in the graphite-like layered materials.

Journal Articles

Total-electron-yield X-ray standing-wave measurements of multilayer X-ray mirrors for interface structure evaluation

Muramatsu, Yasuji; Takenaka, Hisataka*; Gullikson, E. M.*; Perera, R. C. C.*

Japanese Journal of Applied Physics, Part 1, 41(6B), p.4250 - 4252, 2002/06

 Times Cited Count:9 Percentile:60.54(Physics, Applied)

no abstracts in English

Journal Articles

Experimental technique for radiative-process-resolved X-ray absorption spectroscopy at the inner-shell excitation thresholds

Muramatsu, Yasuji; Ueno, Yuko*; Sasaki, Teikichi; Gullikson, E. M.*; Perera, R. C. C.*

Journal of Synchrotron Radiation, 8(2), p.369 - 371, 2002/03

 Times Cited Count:2 Percentile:79.08(Instruments & Instrumentation)

no abstracts in English

Journal Articles

New evaluation beamline for soft X-ray optical elements

Koike, Masato; Sano, Kazuo*; Yoda, Osamu; Harada, Yoshihisa*; Ishino, Masahiko; Moriya, Naoji*; Sasai, Hiroyuki*; Takenaka, Hisataka*; Gullikson, E. M.*; Mrowka, S.*; et al.

Review of Scientific Instruments, 73(3), p.1541 - 1544, 2002/03

 Times Cited Count:20 Percentile:29.88(Instruments & Instrumentation)

no abstracts in English

Journal Articles

Soft X-ray emission and absorption spectra in the 0 K region of microporous carbon and some reference aromatic compounds

Muramatsu, Yasuji; Kuramoto, Kentaro*; Gullikson, E. M.*; Perera, R. C. C.*

Surface Review and Letters, 9(1), p.267 - 270, 2002/02

 Times Cited Count:4 Percentile:72.79(Chemistry, Physical)

no abstracts in English

Journal Articles

Evaluation methods of interlayer-structure-distribution in multilayers by total-electron-yield X-ray standing wave measurements

Muramatsu, Yasuji; Takenaka, Hisataka*; Gullikson, E. M.*; Perera, R. C. C.*

X-sen Bunseki No Shimpo, 33, p.145 - 154, 2002/00

no abstracts in English

Journal Articles

Total-electron-yeild X-ray standing wave measurements of multilayer X-ray mirrors

Muramatsu, Yasuji; Takenaka, Hisataka*; Gullikson, E. M.*; Perera, R. C. C.*

Advanced Light Source Compendium of User Abstracts 2000, 10 Pages, 2001/07

no abstracts in English

Journal Articles

Soft X-ray reflectivity and structure evaluation of CoCr/C multilayer X-ray mirrors for spectral region around 6nm

Takenaka, Hisataka*; Nagai, Komei*; Ito, Hisashi*; Muramatsu, Yasuji; Kawamura, T.*; Gullikson, E. M.*; Perera, R. C. C.*

Nuclear Instruments and Methods in Physics Research A, 467-468(Part1), p.337 - 340, 2001/07

 Times Cited Count:8 Percentile:45.47(Instruments & Instrumentation)

no abstracts in English

Journal Articles

Soft X-ray reflectivity and structure evaluation of Ni/C/Ti/C multilayer X-ray mirrors for water-window region

Takenaka, Hisataka*; Ito, Hisashi*; Nagai, Komei*; Muramatsu, Yasuji; Gullikson, E. M.*; Perera, R. C. C.*

Nuclear Instruments and Methods in Physics Research A, 467-468(Part1), p.341 - 344, 2001/07

 Times Cited Count:24 Percentile:15.09(Instruments & Instrumentation)

no abstracts in English

34 (Records 1-20 displayed on this page)